Experimental Studies of Phase Transitions

相变的实验研究

• 批准号: 9014344
• 负责人: Herman Cummins
• 金额: --
• 依托单位: CUNY City College
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-12-01 至 1994-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9014344&HistoricalAwards=false
• 关键词: Experimental; Studies; Phase; Transitions

This research project will make use of Brillouin and Raman scattering to investigate the incommensurate and lock-in phase transitions in several dielectric crystals. The specific projects include: 1) studies of the longitudinal acoustic anomalies in potassium selenate near the characteristic temperature TI and controversial asymmetries in transverse acoustic modes in potassium selenate and tetramethyltetrachlorozincate; 2) clearing up the remaining controversy concerning the dielectric anomaly in thiourea with Brillouin scattering; 3) studies of the glass transition with lithium chloride solutions and other glass-forming materials; 4) a new study of surface acoustic modes of crystals near the melting point in order to search for the onset of surface melting.

本研究计画将利用布里渊散射及拉曼散射来研究数种介电晶体的无公度及锁相相变。具体项目包括：1）研究了硒酸钾在特征温度TI附近的纵向声学反常现象以及硒酸钾和四甲基四氯锌酸盐在横向声学模中有争议的不对称性; 2）用布里渊散射澄清了关于硫脲介电反常的剩余争议; 3）研究了氯化锂溶液和其他玻璃形成材料的玻璃转变;（4）对熔点附近晶体表面声模的新研究，以寻找表面熔化的起始点。