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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Kartashev A. V., Mel'nikova S. V.
Заглавие : Calorimetric and optical studies of orthorhombic and cubic CsLiCrO4 crystals
Разночтения заглавия :авие SCOPUS: Calorimetric and optical studies of orthorhombic and cubic CsLiCrO 4 crystals
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 11. - P2171-2176. - ISSN 1063-7834, DOI 10.1134/S1063783406110242
Примечания : Cited References: 23
Предметные рубрики: PHASE-TRANSITIONS
X-RAY
NH4LISO4
ALPHA
Аннотация: Careful calorimetric and polarization optical studies of a metastable cubic modification of a CsLiCrO4 crystal (space group (F43m)) are performed. Anomalies of the heat capacity indicative of structural distortions at 92.4 and 69.1 K were revealed, and the values of the thermodynamic parameters of the phase transitions were determined. The crystal twinning in the intermediate phase was studied. A comparative analysis of the phase transitions occurring in a series of ALiMO(4) crystals (A=NH4, Cs; M=S, Cr, Mo, W) was performed. First studies of the monotropic structural transformation F43m - Pmcn and the enantiotropic phase transition Pmcn reversible arrow P112(1)/n were carried out using scanning calorimetry, and the thermodynamic parameters of these transitions were determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Isaenko L. I., Pashkov V. M., Pevnev I. V.
Заглавие : Search for and study of phase transitions in some representatives of the APb(2)X(5) family
Разночтения заглавия :авие SCOPUS: Search for and study of phase transitions in some representatives of the APb2X5 family
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 11. - P2152-2156. - ISSN 1063-7834, DOI 10.1134/S1063783406110217
Примечания : Cited References: 5
Предметные рубрики: CRYSTAL
Аннотация: Single crystals of KPb2Cl5, RbPb2Cl5, and RbPb2Br5 are grown and studied using optical polarization methods. The heat capacity of the crystals is investigated by differential scanning microcalorimetry, and the birefringence and the angle of rotation of the optical indicatrix are measured. The measurements are performed in the temperature range 270-640K. It is found that KPb2Cl5 undergoes a first-order ferroelastic phase transition at T-0 up arrow=530K, T-0 down arrow=528K, and Delta H=1000 +/- 200 J/mol. The transition is accompanied by twinning and a change in symmetry mmm reversible arrow P2(1)/c. The RbPb2Cl5 crystal remains monoclinic up to the melting temperature. The RbPb2Br5 compound belongs to the I4/mcm tetragonal modification and does not undergo structural transformations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Voronov V. N.
Заглавие : Specific features of the ferroelastic phase transition in CsLiS1-zCrzO4 solid solutions
Разночтения заглавия :авие SCOPUS: Specific features of the ferroelastic phase transition in CsLiS 1-z CrzO4 solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 9. - P1786-1790. - ISSN 1063-7834, DOI 10.1134/S1063783406090290
Примечания : Cited References: 11
Предметные рубрики: CSLICRO4 CRYSTAL
X-RAY
CSLISO4
Аннотация: Single crystals of the CsLiS1-zCrzO4 solid solutions (z = 0, 0. 1, 0.4, 0.5, 0.9, 1.0) are grown, optical polarization studies are performed, and the birefringence and the angle of rotation of the optical indicatrix phi(T) are measured. A (z-T) phase diagram is constructed in the temperature range from 77 to similar to 550 K. It is established that substitution of chromium for sulfur has practically no effect on the shape of the optical indicatrix in the initial phase with Pmcn symmetry but produces strong distortions in the monoclinic phase with P112(1)/n symmetry. The unusual shape of the curve phi(T) for compositions with z approximate to 1 is accounted for by the interaction of the polarization-constant tensor components a(ij). No radical differences in the patterns of the ferroelastic phase transition between CsLiSO4 and CsLiCrO4 are revealed (the critical exponent for the transition parameter is beta = 0.33 +/- 0.01). These crystals differ only in the magnitudes of the anomalies, which is associated with the large difference between the ionic radii of sulfur and chromium.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Fokina V. D., Laptash N. M.
Заглавие : Phase transitions in oxyfluoride (NH4)(2)WO2F4
Разночтения заглавия :авие SCOPUS: Phase transitions in oxyfluoride (NH4)2WO 2F4
Место публикации : Phys. Solid State: SPRINGER, 2006. - Vol. 48, Is. 1. - P117-121. - ISSN 1063-7834, DOI 10.1134/S1063783406010239
Примечания : Cited References: 11
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kliava J., Malakhovskii A. V., Edelman I. S., Potseluyko A. M., Melnikova S. V., Petrakovskaja E. A., Zarubina T. V., Petrovskii G., Bruckental I., Yeshurun Y.
Заглавие : Reply to "Comment on 'Unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium' "
Разночтения заглавия :авие SCOPUS: Reply to "comment on 'unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium'"
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2006. - Vol. 74, Is. 2. - Ст.26404. - ISSN 1098-0121, DOI 10.1103/PhysRevB.74.026404
Примечания : Cited References: 8
Предметные рубрики: WALLED CARBON NANOTUBES
HYDROGEN
Аннотация: In this Reply we show that, contrary to the suggestion of Dubroca, Hack, and Hummel (DHH), the feature observed at ca. 55 K in the magnetic susceptibility of gadolinium-containing oxide glasses [as in our earlier paper, Kliava Phys. Rev. B 71, 104406 (2005)] cannot be due to a magnetic transition in oxygen contaminant. In support of this statement, we supply transformed data at low Gd content as well as magnetization curves for a series of glasses containing dysprosium oxide measured with the same superconducting quantum interference device as in our earlier paper. In all these cases the feature in question is absent. Thus, our previous assignment of the 55 K feature to a paramagnetic-to-ferromagnetic transition in Gd clusters in the glass remains the only one consistent with the experimental results.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Misyul' S. V., Bovina A. F., Afanas'ev M. L.
Заглавие : Optical and x-ray studies of the structural phase transition in cryolite (NH4)(3)GaF6
Разночтения заглавия :авие SCOPUS: Optical and x-ray studies of the structural phase transition in cryolite (NH4)3GaF6
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2001. - Vol. 43, Is. 8. - P1594-1597. - ISSN 1063-7834, DOI 10.1134/1.1395110
Примечания : Cited References: 7
Аннотация: Optical polarization and x-ray diffraction studies of powders and single-crystal plates of different cuts of an (NH4)(3)GaF6 crystal are carried out in a broad temperature range, including the phase transition point. The following sequence of symmetry changes is found to occur: O-h(5) - Fm3m (Z = 4)↔ C-i(1) - I (1) over bar (Z = 16). (C) 2001 MAIK "Nauka /Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Misyul' S. V., Bovina A. F., Afanas'ev M. L.
Заглавие : Optical and x-ray diffraction investigations of the symmetry of distorted phases of the (NH4)(2)KGaF6 crystal
Разночтения заглавия :авие SCOPUS: Optical and x-ray diffraction investigations of the symmetry of distorted phases of the (NH4)2KGaF6 crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2002. - Vol. 44, Is. 10. - P1967-1971. - ISSN 1063-7834, DOI 10.1134/1.1514789
Примечания : Cited References: 10
Предметные рубрики: THERMODYNAMIC PROPERTIES
TRANSITION
Аннотация: Powders and single-crystal plates of different sections of an (NH4)(2)KGaF6 crystal are investigated using polarized light microscopy and x-ray diffraction over a wide temperature range, including the phase transition temperatures. It is established that the sequence of symmetry changes in the crystal under investigation is as follows: O-h(5)-Fm3m (Z = 4) ↔ C-4h(5)-I114/m (Z = 2) ↔ C-2h(5)-P112(1)/n (Z = 2). (C) 2002 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Misyul' S. V., Bovina A. F., Afanas'ev M. L.
Заглавие : Polarization-optical and X-ray diffraction investigations on the symmetry of distorted phases of ammonium cryolite (NH4)(3)ScF6
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 2. - P345-349. - ISSN 1063-7834, DOI 10.1134/1.1131210
Примечания : Cited References: 12
Предметные рубрики: TRANSITIONS
Аннотация: Single-crystal plates of different sections of the (NH4)(3)ScF6 crystal have been investigated by polarization-optical microscopy and X-ray diffraction over a wide temperature range, including the temperatures of two known phase transitions and the third transition found recently. It is established that the symmetry of phases changes in the following sequence: O-h(5) - Fm3m (Z = 4) ↔ C-2h(5) - P12(1)/n1 (Z = 2)↔ C-2h(3) -I12/m1 (Z = 16) ↔ C-i(1) - I (l) over bar (Z = 16). (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S. V., Zaitsev A. I.
Заглавие : Ferroelectric phase transition in Cs3Bi2I9
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 1997. - Vol. 39, Is. 10. - P1652-1654. - ISSN 1063-7834, DOI 10.1134/1.1129882
Примечания : Cited References: 7
Аннотация: Single crystals of Cs3Bi2I9 have been grown. Polarized-optical, dielectric, and calorimetric studies have been performed, along with measurements of birefringence, and the coefficients of elasticity c(44), and linear expansion alpha over a wide temperature range. It is found that an intrinsic (pseudo-intrinsic) second-order phase transition to the ferroelastic phase takes place at T-0=220.0+/-0.6 K accompanied by a change of the crystal symmetry from 6/mmc to 2/m. The transition parameter depends linearly on the shear strain x(5) and varies with temperature according to a power law with exponent beta=0.5. (C) 1997 American Institute of Physics.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Gorev M. V., Grankina V. A.
Заглавие : Phase transitions in RbxK1-xLiSO4 mixed crystals
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 7. - P1219-1222. - ISSN 1063-7834, DOI 10.1134/1.1130524
Примечания : Cited References: 12
Предметные рубрики: LOW-TEMPERATURE PHASE
LIKSO4
Аннотация: Structural phase transitions in RbxK1-xLiSO4 mixed crystals (with x varying from 0 to 1) have been studied from the melting point to liquid-nitrogen temperature. Calorimetric (DTA and DSM) data, birefringence and optical polarization measurements were used to construct the full phase (T-x) diagram. It has been established that crystals of most compositions (x less than or equal to 0.95) grow in the hexagonal-trigonal KLiSO4 structure. Replacement of K by the larger Rb atom results in a considerable increase of the region of existence of the P31c phase and expulsion of the high-temperature hexagonal phase. (C) 1998 American Institute of Physics.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S.V., PRIMAK S. V.
Заглавие : CS2CDI4 and CS2ZNI4 crystals with incommensurate phases
Место публикации : Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P.2173-2177. - ISSN 0367-3294
Примечания : Cited References: 7
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S.V., Davydova T. N.
Заглавие : Dispersion of optical-properties of A4CDX6 trigonal crystals
Место публикации : Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P.2094-2097. - ISSN 0367-3294
Примечания : Cited References: 8
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronov V. N., Gorev M. V., Melnikova S.V., Misyul S. V., Flerov I. N.
Заглавие : Structural phase-transitions in Rb2KHOF6 and Rb2KTBF6 elpasolites
Место публикации : Fiz. Tverd. Tela. - 1991. - Vol. 33, Is. 10. - P.2945-2947. - ISSN 0367-3294
Примечания : Cited References: 9
Предметные рубрики: MODE
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S.V., Flerov I. N., Anistratov A. T.
Заглавие : Thermodynamical description of O-H(1)-]G1-]G2-]G3 successive phase-transitions in ABCL3 perovskite structure crystals
Место публикации : Fiz. Tverd. Tela. - 1981. - Vol. 23, Is. 12. - P.3570-3575. - ISSN 0367-3294
Примечания : Cited References: 10
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beznosikov B. V., Flerov I. N., Gorev M. V., Melnikova S.V., Misyul S. V., Voronov V. N.
Заглавие : Structural phase-transitions in elpasolites Rb2NaDYF6 and Rb2KDYF6
Место публикации : Ferroelectr. Lett. Sect. - 1983. - Vol. 1, Is. 2. - P.35-41. - ISSN 0731-5171
Примечания : Cited References: 12
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Isaenko L. I., Mel'nikova S. V., Merkulov A. A., Pashkov V. M., Tarasova A. Y.
Заглавие : Investigation of the influence of gradual substitution K a dagger" Rb on the structure and phase transition in K (x) Rb1-x Pb2Br5 solid solutions
Коллективы : President of the Russian Federation [NSh-1011.2008.2]
Разночтения заглавия :авие SCOPUS: Investigation of the influence of gradual substitution K - Rb on the structure and phase transition in K x Rb1 - X Pb 2Br5 solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 3. - P589-592. - ISSN 1063-7834, DOI 10.1134/S1063783409030251
Примечания : Cited References: 5. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools ( grant no. NSh-1011.2008.2).
Предметные рубрики: CRYSTAL
Аннотация: Single crystals of K (x) Rb1 - x Pb2Br5 solid solutions have been grown and investigated using X-ray diffraction and polarized light microscopy in the temperature range 270-640 K. The regions of existence of the tetragonal (I4/mcm) and monoclinic (P2(1)/c) phases have been determined. It has been demonstrated that the partial introduction of rubidium into KPb2Br5 leads to an increase in the temperature of the ferroelastic phase transition (P2(1)/ca dagger"mmm), so that it approaches the melting temperature. In the solid solutions with x a parts per thousand 0.4-0.5, the temperature region of existence of the orthorhombic phase is narrowed to a parts per thousand 1-2 K. It has been revealed that an increase in the potassium content in the material results in a considerable increase in the incorporation coefficient of Er3+ ions.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Krylov A. S., Zhogal' A. L., Laptash N. M.
Заглавие : Optical studies of phase transitions in the (NH4)(3)Ti(O-2)F-5 crystal
Коллективы : Russian Federation [NSh-1011.2008.2]; Russian Foundation for Basic Research [06-02-16102]; RFBR Enisei [07-02-096800]
Разночтения заглавия :авие SCOPUS: Optical studies of phase transitions in the (NH4) 3Ti(O2)F5 crystal
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 4. - P817-822. - ISSN 1063-7834, DOI 10.1134/S1063783409040301
Примечания : 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).
Предметные 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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Kocharova A. G.
Заглавие : Optical Studies of Phase Transitions in the (NH4)(3)VO2F4 Crystal
Коллективы : Russian Federation [NSh-1011.2008.2]; Russian Foundation for Basic Research [06-02-16 102]
Разночтения заглавия :авие SCOPUS: Optical studies of phase transitions in the (NH4) 3VO2F4 crystal
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 3. - P597-600. - ISSN 1063-7834, DOI 10.1134/S1063783409030275
Примечания : Cited References: 7. - This work was supported by the Council on Grants from the President of the Russian Federation (grant NSh-1011.2008.2) and the Russian Foundation for Basic Research (project no. 06-02-16 102).
Предметные рубрики: (NH4)3VO2F4
Аннотация: (NH4)(3)VO2F4 crystals were grown, and polarization-optical studies and measurements of birefringence were conducted on crystal plates of various cuts over a wide temperature range. Phase transitions were detected at temperatures T-1 up arrow = 417 K, T-3 up arrow = 211 K, and T-4 up arrow = 205 K (on heating) and at T-1 down arrow = 413 K, T-3 down arrow = 210 K, and T-4 down arrow = 200 K (on cooling). The transitions are accompanied by anomalies of the birefringence and by twinning. The sequence of changes in the phase symmetry is assumed to be as follows: cubic Fm (3) over barm↔ orthorhombic Immm (I222(1)) monoclinic 112/m)↔ triclinic P (1) over bar. Near temperatures T-2 approximate to 240-250 K, an additional anomaly of the birefringence is observed, with the crystal retaining the orthorhombic symmetry.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S.V., Vasiliev A. D., Voronov V. N., Bovina A. F.
Заглавие : X-ray and optical studies of CsxRb1-xLiSO4 solid solutions
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 37, Is. 8. - P.2529-2531. - ISSN 0367-3294
Примечания : Cited References: 6
Предметные рубрики: MIXED-CRYSTALS
PHASE
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Melnikova S.V., Misyul S. V., Bovina A. F., Afanasiev M. L., Tresso A.
Заглавие : Ferroelectric phase transitions in cryolite (NH4)(3)ScF6
Коллективы : Конференция по физике сегнетоэлектриков
Место публикации : Izv. Akad. Nauk Ser. Fiz. - 2000. - Vol. 64, Is. 6. - P.1104-1110. - ISSN 1026-3489
Примечания : Cited References: 9
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