Exothermic Supercooled Liquid-Liquid Transition in Amorphous Sulfur

Amorphous sulfur （a-S） is prepared by rapidly compressing molten sulfur to high pressure. From differential scanning calorimeter measurements, a large exothermic peak has been observed around 396K. Online wide-angled x-ray scattering spectra indicate that no crystallization occurs in the temperature...

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Published inChinese physics letters Vol. 31; no. 6; pp. 154 - 157
Main Author 张豆豆 刘秀茹 洪时明 李良彬 崔昆朋 邵春光 何竹 徐济安
Format Journal Article
LanguageEnglish
Published 01.06.2014
Subjects
Compressing
Crystallization
Liquids
Melts
Scanning
Spectra
Sulfur
X-rays
差示扫描量热计
广角X射线
放热过程
温度范围
熔硫
结晶过程
过冷
非晶
Online AccessGet full text
ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/31/6/066401

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Summary:Amorphous sulfur （a-S） is prepared by rapidly compressing molten sulfur to high pressure. From differential scanning calorimeter measurements, a large exothermic peak has been observed around 396K. Online wide-angled x-ray scattering spectra indicate that no crystallization occurs in the temperature range 295-453K, suggesting that the exothermal process corresponds to an amorphous-to-amorphous transition. The transition from amor- phous sulfur to liquid sulfur is further verified by the direct observation of sulfur melt at the temperature of the associated transition. This is the first time of reporting that a-S transforms to liquid sulfur directly, which has avoided a crystallization process. What is more, the transition is an exothermic and a volume expansion process.
Bibliography:Amorphous sulfur （a-S） is prepared by rapidly compressing molten sulfur to high pressure. From differential scanning calorimeter measurements, a large exothermic peak has been observed around 396K. Online wide-angled x-ray scattering spectra indicate that no crystallization occurs in the temperature range 295-453K, suggesting that the exothermal process corresponds to an amorphous-to-amorphous transition. The transition from amor- phous sulfur to liquid sulfur is further verified by the direct observation of sulfur melt at the temperature of the associated transition. This is the first time of reporting that a-S transforms to liquid sulfur directly, which has avoided a crystallization process. What is more, the transition is an exothermic and a volume expansion process.
11-1959/O4
ZHANG Dou-Dou, LIU Xiu-Ru, HONG Shi-Ming, LI Liang-Bin, CUI Kun-Peng,SHAO Chun-Guang, HE Zhu, XU Ji-A（ 1Laboratory of High Pressure Physics, Southwest diaotong University, Chengdu 610031; 2 NationM Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 a National Engineering Research Center for Advanced Polymer Processing Technology; 4Institute of Fluid Zhengzhou University, Zhengzhou 450002 Physics China Academy of Engineering Physics, Mianyang 621000）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/31/6/066401