Kinetic process of dehydration at fusion temperature and the high-temperature phase transition in KH2PO4

被引：9

作者：

Ettoumi, Houda ^{[1
]}

Mhiri, Tahar ^{[1
]}

机构：

[1] Univ Sfax, Fac Sci Sfax, LES, Sfax 3018, Tunisia

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2013年 / 1034卷

关键词：

X-ray diffraction; Raman spectroscopy; Kinetic; Phase transitions; X-RAY; CRYSTAL-STRUCTURE; KDP; POTASSIUM; CONDUCTIVITY; SPECTROSCOPY;

D O I：

10.1016/j.molstruc.2012.09.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

X-ray diffraction and Raman spectroscopy analysis were used to study the kinetic process of dehydration and the high-temperature phase transition (HTPT) in KH2PO4. The results show strong evidence that KH2-PO4 presented two phase transitions at about Ttr = 453 K and 483 K. The new Raman bands, which were observed in the KDP (phase (Ia) and phase (Ib)) spectra (at 128, 152, 372, 437, 540, 904, 926, 966, 1100, 1156 and 1171 cm(-1)), did not correlate to any of the highly intense peaks present in KPO3 (383, 671, and 1139 cm(-1)), K2H2P2O7 (705 and 1041 cm(-1)), and the KnH2PnO3n+1 (n >= 1) polymer (294 cm(-1)) spectra, indicating that a number of structural changes took place. Accordingly, the results presented in the current work corroborate the findings of former studies attributing the phenomena at high temperature in KDP to structural phase transition rather than thermal decomposition. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：112 / 118

页数：7

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