Polymorphic phase transition and thermal stability in squaric acid (H2C4O4)

被引：16

作者：

Lee, Kwang-Sei ^{[3
]}

Kweon, Jin Jung ^{[1
,2
]}

Oh, In-Hwan ^{[4
]}

Lee, Cheol Eui ^{[1
,2
]}

机构：

[1] Korea Univ, Dept Phys, Seoul 136713, South Korea

[2] Korea Univ, Inst Nanosci, Seoul 136713, South Korea

[3] Inje Univ, Ctr Nanomfg, Dept Nanosyst Engn, Gimhae 621749, South Korea

[4] Korea Atom Energy Res Inst, Div Neutron Sci, Taejon 305353, South Korea

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2012年 / 73卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

Crystal growth; Differential scanning calorimetry (DSC); Thermogravimetric analysis (TGA); X-ray diffraction; Phase transitions; ORDER-DISORDER; AMINO-ACIDS; CRYSTALS; DYNAMICS; SOLIDS;

D O I：

10.1016/j.jpcs.2012.02.013

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Phase transformations in squaric acid (H2C4O4) have been investigated by thermogravimetry and differential scanning calorimetry with different heating rates beta. The mass loss in TG apparently begins at onset temperatures T-di=245 +/- 5 degrees C (beta=5 degrees C min(-1)), 262 +/- 5 degrees C (beta=10 degrees C min(-1)), and 275 +/- 5 degrees C (beta=20 degrees C min(-1)). A polymorphic phase transition was recognized as a weak endothermic peak in DSC around 101 degrees C (T-c(+)). Further heating with beta=10 degrees C min(-1) in DSC revealed deviation of the baseline around 310 degrees C (T-i), and a large unusual exothermic peak around 355 degrees C (T-p), which are interpreted as an onset and a peak temperature of thermal decomposition, respectively. The activation energy of the thermal decomposition was obtained by employing relevant models. Thermal decomposition was recognized as a carbonization process, resulting in amorphous carbon. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：890 / 895

页数：6

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