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Calorimetric and 23Na MAS NMR study of the phase diagram of NANB1_xTAxO3 solid solutions / I. P. Aleksandrova [et al.] // Functional Materials. - 2010. - Vol. 17, Is. 1. - P. 18-23 . - ISSN 1027-5495
Аннотация: The heat capacity of NaNb1_xTaxO3 solid solutions was measured in the temperature range 100 to 770 K. The step-like change of phase transition temperature is observed in the T-x phase diagram at concentration x = 0.55. The obtained results are in a good agreement with the data of dielectric studies. The 23Na MAS NMR spectra were obtained at Larmor frequency 79.35 MHz using a Bruker AVANCE 300 spectrometer. The quadru-polar coupling constant, (CQ=e2qQ/h) and asymmetry parameter (n) were determined by computer fitting of the NMR line shape using the DMFit software. The found parameters show that solid solution structure is NaTa03-based at 0.7<X ?1 and NaNbO3-based at 0?x?0.5. The spectra in the intermediate region (0.5<x?0.7) can be described at a reasonable accuracy when assuming the coexistence of NaTaO3 and NaNbO3 structures. В© 2010 - STC "Institute for Single Crystals".

Scopus
Держатели документа:
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Ivanov, Y. N.; Иванов, Юрий Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sukhovskii, A. A.; Суховский, Андрей Андреевич; Voronov, V. N.; Воронов, Владимир Николаевич
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Chemical exchange in NH4HSeO4 single crystals studied by two-dimensional H-2 nuclear magnetic resonance / Y. N. Ivanov [et al.] // J. Phys.: Condens. Matter. - 1999. - Vol. 11, Is. 18. - P. 3751-3760, DOI 10.1088/0953-8984/11/18/310. - Cited References: 16 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
CONDUCTIVITY PROCESSES
AMMONIUM
Кл.слова (ненормированные):
Hydrogen bonds -- Nuclear magnetic resonance -- Single crystals -- Thermal effects -- Ammonium hydrogen selenate -- Ammonium compounds
Аннотация: Processes of chemical exchange of deuterons in partially deuterated ammonium hydrogen selenate, NH4HSeO4 (AHSe), crystals are investigated by means of H-2 nuclear magnetic resonance (NMR) experiments over a wide temperature range. The temperature dependencies of the quadrupole line splittings in the one-dimensional spectra of AHSe above 350 K revealed lineshape changes which are characteristic for chemical exchange processes. A detailed study of these exchange processes in AHSe is achieved by means of two-dimensional H-2 NMR experiments. In the temperature range investigated, a chemical exchange occurs only between those deuteron (proton) sites which are involved in hydrogen bonds (alpha- and beta-positions). It was established that the rates of exchange between all types of hydrogen-bound deuteron are approximately the same. Exchange between these positions and the deuterons in the ND4 groups could not be detected. On the basis of our findings, we finally discuss a model for the microscopic mechanism of hydrogen transport in AHSe.

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Держатели документа:
LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Leipzig, Fak Phys & Geowissensch, D-04103 Leipzig, Germany
ИФ СО РАН
L V Kirensky Institute of Physics, Russian Academy of Science, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Universitat Leipzig, Fakultat fur Physik und Geowissenschaften, Linnestra?e 5, D-04103 Leipzig, Germany

Доп.точки доступа:
Ivanov, Y. N.; Иванов, Юрий Николаевич; Totz, J.; Michel, D.; Klotzsche, G.; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Aleksandrova, I. P.; Александрова, Инга Петровна
}
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Detection of the incommensurate modulation of the hydrogen-bond double-minimum potential in the antiferroelectric phase of NH4HSEO4 / I. P. Aleksandrova [et al.] // Phys. Lett. A. - 1983. - Vol. 95, Is. 6. - P. 339-342, DOI 10.1016/0375-9601(83)90035-X. - Cited References: 15 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

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Держатели документа:
L.V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
ИФ СО РАН
Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Rosanov, O. V.; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Moskvich, Y. N.; Москвич, Юрий Николаевич
}
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Aleksandrova, I. P.
Dielectric permittivity behavior at nonequilibrium processes in nh4hseo4 ferroelectrics / I. P. Aleksandrova, I. V. Seryukova, L. I. Zherebtsova // Fiz. Tverd. Tela. - 1985. - Vol. 27, Is. 11. - P. 3438-3441. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Seryukova, I. V.; Zherebtsova, L. I.; Александрова, Инга Петровна
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Dislocation instability of an incommensurate phase in connection with the floating phase in an NH4HSeO4 crystal / I. P. Aleksandrova, Yu. N. Moskvich, O. V. Rozanov [et al.] // JETP Letters. - 1984. - Vol. 40, Is. 4. - P. 879-881. - Cited References: 7 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

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Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Moskvich, Yu. N.; Москвич, Юрий Николаевич; Rozanov, O. V.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Sukhovskii, A. A.; Суховский, Андрей Андреевич
}
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Dislocations and time-dependent dynamics of the incommensurate phase of NH4HSEO4 / I. P. Aleksandrova [et al.] // Ferroelectr. Lett. Sect. - 1984. - Vol. 1, Is. 5-6. - P. 131-134, DOI 10.1080/07315178408202410. - Cited References: 5 . - ISSN 0731-5171

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Moskvich, Yu. N.; Москвич, Юрий Николаевич; Rozanov, O. V.; Sukhovsky, A. A.; Суховский, Андрей Андреевич
}
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Popov, M. A.
Effect of fluctuations on the NQR spectrum in the incommensurate phase of a Cs2ZnI4 crystal / M. A. Popov, I. P. Aaleksandrova, S. V. Primak // JETP Letters. - 1994. - Vol. 59, Is. 7. - P. 485-487. - Cited References: 5 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

Аннотация: The direct spin-lattice relaxation due to local thermal fluctuations of the amplitude of the atomic-displacement wave -in the incommensurate phase of a crystal can strongly influence the lineshape of the resonant spectrum, reducing the intensity of the outermost temperature-dependent peaks in the frequency distribution, while having essentially no effect on the temperature-independent features of this distribution. This effect is apparently the reason for the anomalous behavior of the NQR spectrum of I-127 in Cs2ZnI4 in a certain temperature interval near the transition from the ''normal'' phase to the incommensurate phase.

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Primak, S. V.
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Effect of hydrostatic-pressure on modulated phases in Rb2ZnBr4 / K. PARLINSKI [et al.] // Phys. Rev. B. - 1992. - Vol. 46, Is. 1. - P. 106-114, DOI 10.1103/PhysRevB.46.106. - Cited References: 36 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
INCOMMENSURATE PHASES
   NEUTRON-SCATTERING
   X-RAY
   COMMENSURATE
   TRANSITIONS
   EVOLUTION
   MODEL
   WAVE
Аннотация: Neutron-diffraction studies on modulated Rb2ZnBr4, carried out under hydrostatic pressure, revealed two new commensurate phases characterized by wave vectors q = 2/7b* and q = 1/4b*, respectively. The first order phase transition between them is revealed by the coexistence of two distinct peaks in the diffraction pattern. The observed pressure-temperature phase diagram contains: the above-mentioned phases, the ferroelectric commensurate phase q = 1/3, and a region characterized by wave-vector values in the interval q = 2/7-1/3. In this region the modulation wave vector exhibits stepwise behavior as a function of pressure, but remains nearly constant iii temperature runs. We have found in this region a characteristic memory effect in which two temperature runs performed at the same pressure lead to two different modulation wave-vector values, while only the thermal history of the sample is different in the two runs. At ambient pressure we confirm the presence of a multipeaked diffraction pattern just above the lock-in transition to the commensurate q = 1/3 phase. At 122 K the phase transition from the 1/3 phase to the 1/4 phase is detected in pressure scans. The transition mechanism involves the q = 2/7 phase, at least as a metastable intermediate phase.

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Держатели документа:
INST NUCL PHYS,PL-31342 KRAKOW,POLAND
LV KIRENSKY PHYS INST,KRASNOYARSK 660036,USSR
ИФ СО РАН
Institut Laue-Langevin, 156X Centre de Tri, 38042 Grenoble, France
Institute of Nuclear Physics, ul. Radzikowskiego 152, 31-342 Cracow, Poland
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institut f?r Kristalographie, Rheinisch-Westfalische Technische Hochschule Aachen, Aachen, Germany
Institut f?r Festkorperforschung, Kernforschungsanlage J?lich G.m.b.H., J?lich D-5170, Germany

Доп.точки доступа:
PARLINSKI, K.; CURRAT, R.; VETTIER, C.; ALEKSANDROVA, I. P.; Александрова, Инга Петровна; ECKOLD, G.
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Effect of impurities on the successive phase transitions in (Cs1-xRbx)(2)ZnI4 compounds / I. P. Aleksandrova [et al.] // J. Phys.: Condens. Matter. - 2002. - Vol. 14, Is. 49. - P. 13623-13634, DOI 10.1088/0953-8984/14/49/316. - Cited References: 27 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
X-RAY
   CS2ZNI4
   SYSTEM
   HEAT
Кл.слова (ненормированные):
Phase transitions -- Point defects -- Specific heat -- Temperature -- X ray diffraction analysis -- Zinc compounds -- Lock-in transition -- Nuclear quadrupole resonance -- Single crystals
Аннотация: The heat capacity, nuclear quadrupole resonance (NQR) and x-ray diffraction of (Cs1-xRbx)(2)ZnI4 single crystals have been measured, for x = 0, 0.001, 0.005, 0.01, 0.025 and 0.05. The normal to incommensurate (N-Inc) phase transition at T-I, the incommensurate to commensurate (Inc-C) lock-in transition at T-L and the structural commensurate monoclinic to triclinic transition at T-LT, observed in the parent compound (x = 0), takes place for x = 0, 0.001, 0.005 and 0.01. For x = 0.025 only T-I and T-L are detected, while for x = 0.05 no transitions were observable. The values of T-I and T-L increase with x while T-LT decreases and disappears at the concentration x = 0.025. The effect of defects, besides modifying the transition temperatures, is that of broadening and lowering the heat capacity anomaly at the lock-in transition until its total quenching for x = 0.05. No observable hysteresis is detected in this transition. NQR and x-ray diffraction data show the Inc-C transition up to the highest concentration. We conclude that this phenomenology is caused by weak interaction of the incommensurate modulation with point defects even in the region close to the Inc-C transition.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
ИФ СО РАН
L V Kirenski Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Inst. de Ciencia de Mat. de Aragon, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Bartolome, J.; Falvello, L. R.; Torres, J. M.; Sukhovskii, A. A.; Суховский, Андрей Андреевич
}
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10.

Ferroelastic phase transition in Cs3Bi2I9: A neutron diffraction study / A. . Jorio [et al.] // Phys. Rev. B. - 2000. - Vol. 61, Is. 6. - P. 3857-3862, DOI 10.1103/PhysRevB.61.3857. - Cited References: 16 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL
SCATTERING
CS3SB2I9
Аннотация: Crystalline Cs3Bi2I9, With the P6(3)/mmc symmetry at room temperature was studied by Laue and four-circle neutron diffractometry from room temperature down to 50 K. At T-0 = 220 K the crystal undergoes a second-order proper ferroelastic phase transition to a polydomain structure with a nonprimitive monoclinic C12/m1 space group. Satellites were not found below T-0, indicating that the continuous distribution of sites observed in previous I-127 nuclear quadrupole resonance experiments is due either to an undetected incommensurate phase characterized by a very small displacement amplitude, or due to the fraction of the crystal volume occupied by domain walls. We argue that thick domain walls are expected in the present structure due to the absence of mechanical compatibility between domains.

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Держатели документа:
Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Ecole Cent Paris, LSPMM, CNRS, UMR 8580, F-92295 Chatenay Malabry, France
CENS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
Univ Toulon & Var, LMMI, F-83957 La Garde, France
ИФ СО РАН

Доп.точки доступа:
Jorio, A.; Currat, R.; Myles, DAA; McIntyre, G. J.; Aleksandrova, I. P.; Александрова, Инга Петровна; Kiat, J. M.; Saint-Gregoire, P.
}
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