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1.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Ivanov Y. N., Totz J., Michel D., Klotzsche G., Sukhovsky A. A., Aleksandrova I. P.
Заглавие
: Chemical exchange in NH4HSeO4 single crystals studied by two-dimensional H-2 nuclear magnetic resonance
Разночтения заглавия
:авие SCOPUS: Chemical exchange in NH4HSeO4 single crystals studied by two-dimensional 2H nuclear magnetic resonance
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 1999. - Vol. 11, Is. 18. - P.3751-3760. - ISSN 0953-8984,
DOI
10.1088/0953-8984/11/18/310
Примечания
: Cited References: 16
Предметные рубрики:
PHASE-TRANSITIONS
CONDUCTIVITY PROCESSES
AMMONIUM
Ключевые слова
(''Своб.индексиров.''): 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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2.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие
: Effect of a restricted geometry on thermal and dielectric properties of NH4HSO4 ferroelectric
Коллективы
: Russia/CIS/Baltic/Japan Symposium on Ferroelectricity , Russian Foundation for Basic Research (RFBR) [16-32-00092 mol_a]
Место публикации
: Ferroelectrics. - 2017. - Vol. 513, Is. 1. - P.44-50. - ISSN 0015-0193,
DOI
10.1080/00150193.2017.1350436. - ISSN 1563-5112(eISSN)
Примечания
: Cited References:17. - The reported study was partially supported by the Russian Foundation for Basic Research (RFBR), research project No. 16-32-00092 mol_a.
Предметные рубрики:
PHASE-TRANSITIONS
AMMONIUM
CAPACITY
SULFATE
KH2PO4
Ключевые слова
(''Своб.индексиров.''): ferroelectric--phase transition--porous glass--nanocomposite
Аннотация:
Heat capacity, thermal dilatation, sensitivity to pressure and permittivity of NH4HSO4 embedded into glass matrices with a pore size of 320 nm and 46 nm were studied. Large difference in the thermal expansion of both glass and ferroelectric leads to a "clamped" state of NH4HSO4 in nanocomposites and to the phase transition temperatures change. The restricted geometry does not effect on the order of successive transformations in NH4HSO4 but is accompanied by a significant reduction in entropy of phase transitions. The behavior of DTA-signal and permittivity show the expansion of the temperature range of the ferroelectric phase under hydrostatic pressure.
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3.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Mikhaleva E. A., Flerov I. N., Bondarev V. S., Gorev M. V., Vasiliev A. D., Davydova T. N.
Заглавие
: Electrocaloric and barocaloric effects in some ferroelectric hydrosulfates and triglycinesulfate
Коллективы
: European Meeting on Ferroelectricity
Место публикации
: European Meeting on Ferroelectricity (12 ; 2011 ; 26 June - 1 July ; Bordeaux, France). Ferroelectrics: Taylor & Francis LTD, 2012. - Vol. 430. - P.78-83. - ISSN 0015-0193,
DOI
10.1080/00150193.2012.677717
Примечания
: Cited References: 14. - This work was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (project no, Nsh - 4645.2010.2).
Предметные рубрики:
PHASE-TRANSITIONS
AMMONIUM
RbHSO4
Ключевые слова
(''Своб.индексиров.''): ferroelectrics--phase transitions--electrocaloric and barocaloric effects
Аннотация:
A comparative analysis of electrocaloric and barocaloric efficiency of order-disorder ferroelectrics Rbx(NH4)1-xHSO4 and TGS is performed. A good agreement was found between intensive electrocaloric effects measured experimentally and calculated using electric equation of state. Barocaloric effects were evaluated analyzing the experimental data on heat capacity and T-p phase diagrams. In some crystals under study the same adiabatic temperature change can be produced by low pressure and rather high electric field.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Flerov I. N., Kartashev A. V., Gorev M. V., Bogdanov E. V., Mel'nikova S. V., Molokeev M. S., Pogoreltsev E. I., Laptash N. M.
Заглавие
: Thermal, structural, optical, dielectric and barocaloric properties at ferroelastic phase transition in trigonal (NH4)2SnF6: A new look at the old compound
Место публикации
: J. Fluor. Chem.: Elsevier, 2016. - Vol. 183. - P.1-9. - ISSN 00221139 (ISSN),
DOI
10.1016/j.jfluchem.2015.12.010
Примечания
: Cited References: 25. - The reported study was partially supported by RFBR, research project No. 15-02-02009a.
Предметные рубрики:
Heat-capacity
Ammonium
(NH4)3TiF7
Pressure
Ключевые слова
(''Своб.индексиров.''): fluorides--structural disorder--phase transitions--entropy--barocaloric effect
Аннотация:
Structural phase transition P-3m1 → P-1 of the first order and nonferroelectric nature was found in (NH4)2SnF6 at about 110 K in the process of thermal, optical, dielectric and X-ray studies. Order-disorder transformation is accompanied by large changes of entropy (ΔS0 = 16.4 J/mol K) and volume (ΔV0/V ≈ 1%). The structural model associated with three orientations of NH4 tetrahedra in P-3m1 phase and their complete ordering in P-1 phase was suggested with the entropy change (ΔS0 = 18.3 J/mol K) close to the experimental value. A good agreement between baric coefficients measured in a direct way (dT0/dp = -157 K/GPa) and evaluated using entropy and volume changes at phase transition (-170 K/GPa) was found. Barocaloric effects in (NH4)2SnF6 are comparable with those of known solid state refrigerants and are characterised by a low-pressure need for realising their maximum values. © 2015 Elsevier B.V. All rights reserved.
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