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Raman spectroscopic study of the phase transitions in the (NH4)(3)WO3F3 oxyfluoride / A. N. Vtyurin [et al.] // Phys. Solid State. - 2006. - Vol. 48: 17th All-Russia Conference on the Physics of Ferroelectrics (VKS-XVII) (JUN 26-JUL 01, 2005, Penza, RUSSIA), Is. 6. - P. 1067-1069, DOI 10.1134/S1063783406060151. - Cited References: 7 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The Raman spectra of (NH4)(3)WO3F3 perovskite-like oxyfluorides are measured in the frequency range 70-3600 cm(-1). The anomalies observed in the spectral parameters upon phase transitions at a temperature of 200 K under atmospheric pressure and at room temperature under a pressure of 1.4 GPa are interpreted.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Voit, E. I.
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Raman spectroscopic study of the phase transitions in the Cs2NH4WO3F3 oxyfluoride / A. S. Krylov [et al.] // Phys. Solid State. - 2006. - Vol. 48: 17th All-Russia Conference on the Physics of Ferroelectrics (VKS-XVII) (JUN 26-JUL 01, 2005, Penza, RUSSIA), Is. 6. - P. 1064-1066, DOI 10.1134/S106378340606014X. - Cited References: 5 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The Raman spectra of Cs2NH4WO3F3 elpasolite crystals are studied in the temperature range 93373 K at pressures of up to 6.3 GPa. No indication of a phase transition is revealed from the Raman spectra as the temperature decreases to 93 K. An analysis of the Raman spectra measured under pressure demonstrates that the Cs2NH4WO3F3 elpasolite crystals undergo a phase transition at a pressure of 2.58 GPa. Judging from the behavior of the pressure dependences of the vibrational frequencies, the revealed phase transition is associated with the lowering of the symmetry of the WO3F3 octahedra.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Mineral & Petrog, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Mineralogy and Petrography, Siberian Division, Russian Academy of Sciences, Universitetskii pr. 3, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Goryainov, S. V.; Kocharova, A. G.; Кочарова, Алла Георгиевна
}
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Mel'nikova, S. V.
Phase transitions in oxyfluoride (NH4)(2)WO2F4 / S. V. Mel'nikova, V. D. Fokina, N. M. Laptash // Phys. Solid State. - 2006. - Vol. 48, Is. 1. - P. 117-121, DOI 10.1134/S1063783406010239. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: (NH4)(2)WO2F4 single crystals are grown, and their polarization-optical, calorimetric, and birefringence properties are studied in the temperature range 90-350K. A first-order structural phase transition is found to occur at T-01 up arrow = 202K with thermal hysteresis of Delta T-01 approximate to 6-12K. The phase transition is accompanied by twinning and modification of the symmetry Cmcm↔ (1) over bar. An additional weak anomaly in the differential scanning calorimeter signal is found at T-02 approximate to 170K. The total thermal effect of both anomalies is = 3200 +/- 400 J/mol and Sigma Delta S-i = 16.5 +/- 2.0 J/mol K. The phase transition at T-01 is of the order-disorder type.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Мельникова, Светлана Владимировна
}
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A study of phase transition in (NH4)(3)WO3F3 oxyfluoride by Raman scattering / A. S. Krylov [et al.] // Phys. Status Solidi B. - 2006. - Vol. 243, Is. 2. - P. 435-441, DOI 10.1002/pssb.200541259. - Cited References: 11 . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
ELPASOLITE RB2KSCF6
Аннотация: Raman scattering spectra of perovskite-like (NH4)(3)WO3F3 oxyfluoride are studied in the 70-3600 cm(-1) frequency range and the 93-323 K temperature range including the transition point from orientationally disordered cubic phase into the lower symmetry one. Internal vibrations of ammonium ions and WO3F3 octahedra have been found to exhibit transition anomalies. Analysis of measurements suggests that the transition under study is due mainly to the ordering of octahedra.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institute of Chemistry, 690022 Vladivostok, Russian Federation

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Voyt, E. I.
}
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Raman scattering study of the phase transition in the (NH4)(3)WO3F3 oxyfluoride / A. S. Krylov [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 7. - P. 1356-1362, DOI 10.1134/S1063783406070237. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The Raman scattering spectra of polycrystalline samples of the (NH4)(3)WO3F3 perovskite-like oxyfluoride were measured at frequencies of 70-3600 cm(-1) in the temperature range 93-323 K, including the transition from the orientationally disordered cubic phase to the low-symmetry phase. Transitional anomalies in the spectral parameters were revealed in the frequency ranges of internal vibrations of the ammonium ions and WO3F3 octahedral groups. An analysis of the experimental results allowed the conclusion that the phase transition under study is associated primarily with the ordering of the octahedral groups.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Laptash, N. M.; Voit, E. I.
}
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Molokeev, M. S.
Crystal structures of room- and low-temperature phases in oxyfluoride (NH4)(2)KWO3F3 / M. S. Molokeev, A. D. Vasiliev, A. G. Kocharova // Powder Diffr. - 2007. - Vol. 22, Is. 3. - P. 227-230, DOI 10.1154/1.2759491. - Cited References: 8. - Cover image: Artwork representing main idea of this article . - ISSN 0885-7156

РУБ Materials Science, Characterization & Testing

Кл.слова (ненормированные):
structure determination -- Rietveld analysis -- powder diffraction -- phase transition -- oxyfluoride
Аннотация: Crystal structures of (NH4)2KWO(3)F(3) at 298 K and 113 K were solved from X-ray powder diffraction data and refined by the Rietveld technique. The compound is isostructural with elpasolite K2NaAlF6 at room temperature with space group Fm-3m, a=8.95850(5) angstrom, V=718.961(7) angstrom(3), Z =4, D-x=3.363 g/cm(3), and M-W=364.02. The structure was refined over 18 parameters to R-wp =12.6%, R-p=10.9%, R-exp=5.03%, and R-B=3.27% from 40 independent reflections. (NH4)2KWO(3)F(3) was transformed upon cooling to a ferroelastic monoclinic phase with space group P2(1)/n, a'=6.3072(3) angstrom, b'=6.3028(3) angstrom, c'=8.9882(3) angstrom, beta'=90.242(2)degrees, V=357.30(3) angstrom(3), Z =2, and D-x=3.383 g/cm(3). The low-temperature structure at 113 K was refined over 28 parameters,P to R-wp=20.9%, R-p=21.3%, R-exp= 12.5%, and R-B=6.93% from 453 independent reflections. (C) 2007 International Centre for Diffraction Data.

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Доп.точки доступа:
Vasiliev, A. D.; Васильев, Александр Дмитриевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Молокеев, Максим Сергеевич
}
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Effect of deuteration on the thermal properties and structural parameters of the (NH4)(2)WO2F4 oxyfluoride / I. N. Flerov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 6. - P. 1149-1156, DOI 10.1134/S1063783407060212. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   PHASE-TRANSITIONS
   (NH4)(3)WO3F3
   (NH4)(3)TIOF5
Аннотация: The thermal properties and structure of (ND4)(2)WO2F4 crystals are investigated. It is established that deuteration does not lead to a change in the symmetry of the initial phase Cmcm but considerably decreases the extent of its disordering, which, in turn, brings about a substantial decrease in the phase transition entropy. Apart from the anomalies associated with phase transitions characteristic of the protonic compound, the heat capacity exhibits two additional anomalies. Analysis of the phase diagram of the deuterated crystal reveals a triple point at a pressure p = 0.18 GPa, which is predicted for (NH4)(2)WO2F4 at about 0.7 GPa.

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Держатели документа:
LV Kirenskii Inst Phys, Russian Acad Sci, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Kocharova, A. G.; Кочарова, Алла Георгиевна
}
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Mel'nikova, S. V.
Phase transitions in the oxyfluoride (NH4)(3)NbOF6 / S. V. Mel'nikova, N. M. Laptash, A. L. Zhogal' // Phys. Solid State. - 2007. - Vol. 49, Is. 5. - P. 958-962, DOI 10.1134/S1063783407050253. - Cited References: 11 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
RAY-DIFFRACTION INVESTIGATIONS
   DISTORTED PHASES
   SYMMETRY
   DISORDER
   CRYSTAL
Аннотация: (NH4)(3)NbOF6 single crystals were grown, polarization-optical studies were performed, and birefringence was measured over the temperature range 90-500 K. A sequence of first-order structural phase transitions was found at temperatures T (1 down arrow) = 259.7 K and T (2 down arrow) = 257.7 K with temperature hysteresis delta T-1 = 0.9 K and delta T-2 = 1.9 K. The transitions are accompanied by twinning and the following change in the crystal symmetry: cubic paired left right arrows tetragonal paired left right arrows monoclinic. Optical second harmonic generation is found to occur at room temperature, which indicates that the cubic phase is not centrosymmetric. It is assumed that the phase transitions are ferroelastic and ferroelectric in nature.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Laptash, N. M.; Zhogal', A. L.; Мельникова, Светлана Владимировна
}
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Crystal structures of room- and low-temperature phases in oxyfluoride (N H4) 2 KW O3 F3 / M. S. Molokeev, A. D. Vasiliev, A. G. Kocharova // Powder Diffraction. - 2007. - Т. 22, № 3. - С. 227-230, DOI 10.1154/1.2759491 . - ISSN 0885-7156

РИНЦ
Держатели документа:
L. V. Kirensky Institute of Physics,SB RAS

Доп.точки доступа:
Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Kocharova, A. G.; Кочарова, Алла Георгиевна
}
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10.

Mechanism and nature of phase transitions in the (NH4)(3)MoO3F3 oxyfluoride / I. N. Flerov [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 3. - P. 515-524, DOI 10.1134/S1063783408030219. - Cited References: 13 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(2)WO2F4
DIFFRACTION
CS
Аннотация: The temperature dependences of the heat capacity, the unit cell parameter, and the permittivity for the (NH4)(3)MoO3F3 cryolite (space group Fm (3) over barm) are investigated. It is revealed that the compound undergoes ferroelectric and ferroelastic structural phase transitions at temperatures of 297 and 205 K, respectively. The mechanism of structural distortions is discussed in terms of the entropy parameters, pressure-temperature phase diagrams, and electron density maps for critical atoms. An analysis is made of the influence of the cation size and shape on the phase transitions in oxyfluorides of the general formula A(2)A'MO3F3 (A,A' = NH4, K; M = Mo, W).

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Держатели документа:
[Flerov, I. N.
Fokina, V. D.
Bovina, A. F.
Bogdanov, E. V.
Molokeev, M. S.
Kocharova, A. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Pogorel'tsev, E. I.] Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Bovina, A. F.; Бовина, Ася Федоровна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Pogorel'tsev, E. I.; Laptash, N. M.
}
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11.

Mel'nikova, S. V.
Phase transitions in orthorhombic oxyfluoride (NH4)(2)MoO2F4 / S. V. Mel'nikova, N. M. Laptash // Phys. Solid State. - 2008. - Vol. 50, Is. 3. - P. 511-514, DOI 10.1134/S1063783408030207. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(2)WO2F4
Аннотация: (NH4)(2)MoO2F4 single crystals were grown and studied using polarization-optical methods, and the birefringence was measured in the temperature range 90-350 K. The following sequence of phase transitions is revealed: G(0) reversible arrow G(1) reversible arrow G(2). It is established that the phase transition at delta T-01 approximate to 267 K is of the first order and exhibits thermal hysteresis delta T-01 approximate to 0.6 K. A weak anomaly is found in Delta n(T) at T-02 approximate to 180 K. The crystals are shown to retain the orthorhombic symmetry during the phase transitions.

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Держатели документа:
[Mel'nikova, S. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Laptash, N. M.; Мельникова, Светлана Владимировна
}
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12.

A Raman scattering study of the phase transition in the ammonium oxyfluoride (NH4)(3)TiOF5 / Y. V. Gerasimova [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 8. - P. 1534-1537, DOI 10.1134/S1063783408080246. - Cited References: 8 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(3)WO3F3 OXYFLUORIDE
Аннотация: Raman spectra of a polycrystalline sample of the perovskite-like oxyfluoride (NH4)(3)TiOF5 are measured in the frequency region 100-3600 cm(-1) at temperatures ranging from 91 to 370 K under hydrostatic pressures of up to 9 GPa, which include the range of the phase transition from the orientationally disordered cubic phase to the low-symmetry phase. Anomalies in the spectral parameters due to the phase transition are revealed in the range of vibrations of TiOF5 octahedral groups.

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Держатели документа:
[Gerasimova, Yu. V.
Krylov, A. S.
Vtyurin, A. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Gerasimova, Yu. V.
Krylov, A. S.
Vtyurin, A. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Branch, Vladivostok 690022, Russia
[Goryainov, S. V.] Inst Mineral & Petrog, Siberian Branch, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far-East Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation
Institute of Mineralogy and Petrography, Siberian Branch, Universitetskii pr. 3, Novosibirsk 630090, Russian Federation

Доп.точки доступа:
Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Laptash, N. M.; Goryainov, S. V.
}
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13.

Orthorhombic aluminium oxyfluoride, AlOF / A. D. Vasiliev, S. V. Melnikova, L. I. Isaenko // Acta Crystallogr. Sect. C-Cryst. Struct. Commun. - 2009. - Vol. 65. - PI20-I22, DOI 10.1107/S0108270109010671. - Cited Reference Count: 11. - Гранты: This work was supported by the RFFI (grant No. 07-0200442) and the Interdisciplinary Integration Project of the Siberian Branch of the Russian Academy of Sciences (No. 34). - Финансирующая организация: RFFI [07-0200442]; Interdisciplinary Integration Project of the Siberian Branch of the Russian Academy of Sciences [34] . - APR. - ISSN 0108-2701
Аннотация: Crystals of the title compound were extracted from the bulk of grown SrAlF(5) crystals as unexpected inclusions that were identified as the long sought after aluminium oxyfluoride. The structure of AlOF is built up from tetrahedral and octahedral polyhedra. Each tetrahedron is bisected by a mirror plane, with the Al atom and two vertex anions in the plane. All tetrahedral vertices are positions of competing oxide and fluoride ions and are shared with octahedra. These shared vertices belong to two octahedral edges which join the octahedra to form infinite zigzag chains. The chains are strung along twofold screw axes that run parallel to the unit-cell b axis. The remaining two octahedral vertices are occupied only by fluoride ions. A small deficiency in the occupation of the octahedral Al position was suggested by the refinement. However, the stoichiometry of the compound is AlOF within experimental uncertainty. The Al-F(O) distances are separated into three groups with average values of 1.652 (3) (tetrahedra), 1.800(2) (octahedra) and 1.894 (2) angstrom (octahedra). This structure differs widely from the reported tetragonal phase Al(1-x)O(1-3x)F(1+ 3x) (x = 0.0886) [Kutoglu (1992). Z. Kristallogr. 199, 197-201], which consists solely of octahedral structural units.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Vasiliev, A. D.; Васильев, Александр Дмитриевич; Melnikova, S.V.; Мельникова, Светлана Владимировна; Isaenko, L. I.
}
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14.

Thermal properties and phase transitions in oxyfluoride (NH4)2NbOf5 / E. V. Bogdanov, M. V. Gorev, V. D. Fokina [et al.] // The 6th International Seminar on Ferroelastic Physics : abstract book. - Voronezh, 2009. - P. 26

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Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Воронежский государственный технический университет; Российская академия наук; International Seminar on ferroelastic physics (6 ; 2009 ; Sept. 22-25 ; Voronezh); Международный семинар по физике сегнетоэластиков (6(11) ; 2009 ; 22-25 сент. ; Воронеж)
}
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15.

Optical studies of phase transitions in the (NH4)(3)Ti(O-2)F-5 crystal / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 4. - P. 817-822, DOI 10.1134/S1063783409040301. - Cited References: 13. - This work was supported by the Council on Grants from the President of the Russian Federation (project no. NSh-1011.2008.2), the Russian Foundation for Basic Research (project no. 06-02-16102), and RFBR Enisei (project no. 07-02-096800). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
(NH4)(3)WO3F3 OXYFLUORIDE
RAMAN-SCATTERING
DISORDER
Аннотация: Polarization-optical study of twinning and measurements of the Raman spectra and birefringence in oxyfluoride (NH4)(3)Ti(O-2)F-5 were carried out over the temperature range 90-350 K. Phase transitions were detected at temperatures T (01) = 266 K (second-order transition) and T (02) = 225 K (first order). It is assumed that the crystal symmetry is changed as follows: Fm3m a dagger" I4/mmm a dagger" I4/m. Anomalies of the spectral parameters are established in the frequency range of internal vibrations of ammonium ions and Ti(O-2)F-5 complexes. An analysis of the results shows that the transition at T (01) is likely due to small shifts of the tetrahedral groups from their position on the triad axis and that the transition at T (02) is due to fluorine-oxygen ordering of Ti(O-2)F-5 complexes.

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Держатели документа:
[Mel'nikova, S. V.
Krylov, A. S.
Zhogal', A. L.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Krylov, A. S.; Крылов, Александр Сергеевич; Zhogal', A. L.; Laptash, N. M.; Russian Federation [NSh-1011.2008.2]; Russian Foundation for Basic Research [06-02-16102]; RFBR Enisei [07-02-096800]
}
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16.

Inelastic neutron scattering study of the specific features of the phase transitions in (NH4)(2)WO2F4 / L. S. Smirnov [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 11. - P. 2362-2366, DOI 10.1134/S1063783409110262. - Cited References: 15. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the ORNL/SNS controlled by UT-Battelle, LLC, the U.S. Department of Energy (contract DE-AC05-00OR22725); the experiments in the Argonne National Laboratory were supported by the Office of General Sciences on Energy, Division of Materials Science of the U.S. Department of Energy (contract DE-AC02-06CH11357). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
OXYFLUORIDE
   (NH4)(3)WO3F3
   MECHANISM
   RB
   CS
Аннотация: Oxyfluoride (NH4)(2)WO2F4 has been studied by the inelastic neutron scattering method over a wide temperature range 10-300 K at two initial neutron energies of 15 and 60 meV. The role of tetrahedral ammonium groups in the mechanism of sequential phase transitions at T (1) = 201 K and T (2) = 160 K has been discussed.

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Держатели документа:
[Smirnov, L. S.] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia
[Kolesnikov, A. I.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA
[Flerov, I. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Smirnov, L. S.; Kolesnikov, A. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation [09-02-00062]; U.S. Department of Energy [DE-AC05-00OR22725, DE-AC02-06CH11357]
}
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17.

Phase transitions in the (NH4)(2)NbOF5 oxyfluoride / V. D. Fokina [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 4. - P. 781-788, DOI 10.1134/S1063783410040189. - Cited References: 13. - We would like to thank A. A. Udovenko (Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia) for kindly supplied detailed data on the atomic coordinates in the structure of the (NHINF4/INF)INF2/INFNbOFINF5/INF oxyfluoride.This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-1011.2008.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   (NH4)(2)WO2F4
   MECHANISM
   DISORDER
Аннотация: The thermal and dielectric properties of the (NH4)(2)NbOF5 oxyfluoride have been investigated. It has been established that the structural phase transitions Cmc2(1) - C2 - Ia observed at the temperatures T (1) = 258.0 K and T (2) = 218.9 K exhibit a nonferroelectric nature. The hydrostatic pressure, which stabilizes the initial phase and destabilizes the low-temperature phase, hardly affects the temperature range of stability of the intermediate phase. The model of sequential ordering of the structural elements due to phase transitions has been analyzed using experimental data on the entropies of the phase transitions.

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Держатели документа:
[Fokina, V. D.
Bogdanov, E. V.
Gorev, M. V.
Molokeev, M. S.
Flerov, I. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Fokina, V. D.
Gorev, M. V.
Pogorel'tsev, E. I.
Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Bogdanov, E. V.; Богданов, Евгений Витальевич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pogorel'tsev, E. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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18.

Thermal expansion, phase diagrams and barocaloric effects in (NH4)(2)NbOF5 / M. . Gorev [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 18. - Ст. 185901, DOI 10.1088/0953-8984/22/18/185901. - Cited References: 17. - This work was supported in part by the Krasnoyarsk Regional Foundation for Support of Scientific and Scientific-Technological Investigations and RFBR in the framework of project 'Siberia' (Grant No. 09-02-98001), and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (project No. Nsh-1011.2008.2). . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   SOLID-STATE
   OXYFLUORIDE
   TRANSITION
   ANION
Кл.слова (ненормированные):
Antiferromagnets -- Ferromagnets -- Heat capacities -- High stress -- Intermediate phase -- Pippard relations -- Structural phase transition -- Transition temperature -- Uniaxial pressures -- Financial data processing -- Phase diagrams -- Phase transitions -- Thermal stress -- Tools -- Thermal expansion
Аннотация: The thermal expansion along the a, b and c axes of a (NH4)(2)NbOF5 crystal was measured from 120 to 300 K. Anomalies of alpha(T) associated with previously reported phase transitions Cmc2(1) -> C-2 -> I a were observed along all directions at T-1 = 259.3 K and T-2 = 220.5 K. The analysis of thermal expansion and heat capacity in the frame of the Pippard relations has permitted us to determine the uniaxial pressure derivatives of the transition temperatures dT/d sigma(i). The T-sigma(i) phase diagrams have shown a tendency for the intermediate phase to disappear at high stress along the b and c axes. Intensive and extensive barocaloric effects near the structural phase transitions were found to be comparable with the caloric parameters of some ferroelectrics, ferromagnets and antiferromagnets.

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Держатели документа:
[Gorev, Michail
Bogdanov, Evgeny
Flerov, Igor] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Gorev, Michail
Flerov, Igor] Siberian Fed Univ, Inst Engn Phys, Krasnoyarsk 660041, Russia
[Laptash, Nataly] Russian Acad Sci, Far Eastern Div, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
LVKirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok 660036, Russian Federation
Institute of Engineering Physics, Siberian Federal University, av. Svobodny 79, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry, Far Eastern Division, Russian Academy of Sciences, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Gorev, M.; Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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19.

Structural and electronic parameters of ferroelectric K3WO3F3 / V. V. Atuchin [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 43-44. - P. 2085-2088, DOI 10.1016/j.ssc.2010.09.023. - Cited References: 34. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34). . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
CORE-LEVEL SPECTROSCOPY
   PHASE-TRANSITIONS
   RHEED ANALYSIS
   SURFACE
   OXYFLUORIDE
   ELPASOLITE
   (NH4)(2)KWO3F3
   SUBSTITUTION
   TEMPERATURE
   DIFFRACTION
Кл.слова (ненормированные):
Ferroelectrics -- Chemical synthesis -- Electronic structure -- Photoelectron spectroscopies
Аннотация: The low-temperature ferroelectric G2 polymorph of K3WO3F3 oxyfluoride is formed by chemical synthesis. The electronic parameters of G2-K3WO3F3 have been measured by X-ray photoelectron spectroscopy under excitation with Al K alpha radiation (1486.6 eV). Detailed spectra have been recorded for all element core levels and Auger lines. The chemical bonding effects in the WO3 F-3 and WO6 octahedrons are considered by using the binding energy difference Delta BE(O-W) = BE(O 1s) BE(W 4f(7/2)). (C) 2010 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Atuchin, V. V.] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
[Gavrilova, T. A.] SB RAS, Inst Semicond Phys, Lab Nanolithog & Nanodiagnost, Novosibirsk 630090, Russia
[Kesler, V. G.] SB RAS, Inst Semicond Phys, Lab Phys Principles Integrated Microelect, Novosibirsk 630090, Russia
[Molokeev, M. S.
Aleksandrov, K. S.] SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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20.

Mel'nikova, S. V.
Optical studies of phase transitions in oxyfluoride (NH4)(2)NbOF5 / S. V. Mel'nikova, N. M. Laptash, K. S. Aleksandrov // Phys. Solid State. - 2010. - Vol. 52, Is. 10. - P. 2168-2172, DOI 10.1134/S1063783410100240. - Cited References: 6. - This study was supported by the Council on Grants from the President of the Russian Federation (grant no. NSh 4645.2010.2), the Russian Foundation for Basic Research (project no. 09-02-00062), and the Siberian Branch of the Russian Academy of Sciences (Integration Project no. 101). . - ISSN 1063-7834
Рубрики:
(NH4)(2)MOO2F4
Аннотация: Polarization-optical studies and measurements of the birefringence Delta n and the angle of rotation of the optical indicatrix for the (NH4)(2)NbOF5 crystal have been carried out in the temperature range 100-350 K. Two anomalies of the birefringence have been revealed at the temperatures T (01) = 258 K and T (02) a parts per thousand 219 K. According to the twinning pattern, the crystal undergoes successive changes in symmetry: orthorhombic a dagger" monoclinic 1 a dagger" monoclinic 2. The twofold axis of the monoclinic phases (or the normal to the plane) is directed along [001](or). The effect of the uniaxial compression along [011](or) and the electric field E a parts per thousand 25 kV/cm along [100](or) on the twin structure has been studied. The ferroelastic phase transition at T (01) is due to the appearance of the shear deformation x (4)(T) and is accompanied by significant anomalies of the birefringence. Strong pretransition phenomena mask the jumps in the birefringence Delta n(T) and in the angle of rotation of the indicatrix phi(T) at T (01).

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Публикация на русском языке Мельникова, Светлана Владимировна. Оптические исследования фазовых переходов в оксифториде (NH[4])[2]NbOF[5] [Текст] / С. В. Мельникова, Н. М. Лапташ, К. С. Александров // Физ. тверд. тела. - 2010. - Т. 52 Вып. 10. - С. 2023-2027

Держатели документа:
Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Laptash, N. M.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Мельникова, Светлана Владимировна
}
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