The structure and phase transitions in oxyfluoride (ND4)2MoO2F4

被引：3
|
作者：
Bogdanov, Evgeniy V. [1 ,2 ]
Mel'nikova, Svetlana V. [1 ]
Pogoreltsev, Evgeniy I. [1 ,3 ]
Molokeev, Maxim S. [1 ,4 ]
Flerov, Igor N. [1 ,3 ]
机构：
[1] RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[2] Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
[3] Siberian State Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia
[4] Far Eastern State Transport Univ, Khabarovsk 680021, Russia
来源：
SOLID STATE SCIENCES | 2016年 / 61卷
基金：
俄罗斯基础研究基金会;
关键词：
(NH4)(2)MOO2F4; (NH4)(2)WO2F4; DIAGRAMS; CRYSTALS; DISORDER;
D O I：
10.1016/j.solidstatesciences.2016.08.012
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Single crystals of (ND4)(2)MoO2F4 containing 95% deuterium were produced by repeated recrystallization of (NH4)(2)MoO2F4 in heavy water. The effect of deuteration on the parameters of successive phase transitions was investigated by differential scanning microcalorimetry and polarization optics. X-ray analysis of the original and distorted phases was performed. It was found that deuteration does not change the sequence of crystal phases typical for (NH4)(2)MoO2F4, but leads to a shift in the phase transition Cmcm -> Pnma towards the tricritical point. The mechanism of phase transitions in (ND4)(2)MoO2F4 was associated with both the ordering and the displacement of atoms. (C) 2016 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码：155 / 160
页数：6
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