Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1021/acs.inorgchem.7b00811

Аннотация: Thermal and dielectric studies of (ND4)2MoO2F4 crystals undergoing successive phase transitions at T1 = 272 K and T2 = 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first order to the tricritical point. The direct participation of ammonium groups in the mechanism of structural distortions is demonstrated by a decrease in the entropy of the high-temperature phase transition (ΔS1 = R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T-p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of ptrp ≈ −0.8 GPa.

Журнал: Inorganic Chemistry

Выпуск журнала: Т. 56, № 11

Номера страниц: 6706-6711

ISSN журнала: 00201669

Издатель: American Chemical Society

• Bogdanov E.V. (Institute of Engineering Systems and Energy,Krasnoyarsk State Agrarian University)
• Pogoreltsev E.I. (Institute of Engineering Physics and Radioelectronics,Siberian State University)
• Gorev M.V. (Institute of Engineering Physics and Radioelectronics,Siberian State University)
• Flerov I.N. (Institute of Engineering Physics and Radioelectronics,Siberian State University)

• Scopus
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