权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

A Study on the Structural Relaxation by the Simultabeous Measurements of enthalpy and Volume under High Pressure

高压下同时测量焓和体积的结构弛豫研究

基本信息

批准号：
04640447
负责人：
YAMAMURO Osamu
金额：
$ 1.34万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

I have costructed an adiabatic calorimeter which can measure enthalpy and volume of sample simultaneously under high pressure, the method of the enthalpy measurement is similar to that of usual adiabatic calorimeters working at ambient pressure. The cylindrical sample cell is very massive (650 g) and made of copperberyllium alloy to keep the inside pressure. The sample volume can ve obtained by measuring the length of the bellows which is installed inside the cell. A magnet, which is outside the cryostat, is commected to the top of the bellows with a stainless-steel rod. The length of the bellows can be determined by measuring the positon of the magnet with magnet sensors with resolution of 0.1 mum. The temperature and pressure ranges of the calorimeter are 100-375 K and 0-200 MPa, respectively. The temperature and pressure ranges of the temperature measurement is 100 nK and the precision of the pressure control is 1 kPa(0.01 bar).the precision of the heat capacity measurement of the empty cell was 0.02 %. The test measurements for water, which is selected as a standard material, showed excellent accuracy of heat capacity (0.2 %) and volume (1x19^<-5>%). These are accurate enough for the measurements on the structural relaxation.As a preliminary experiment for the simultaneous measurements on the structural relaxation, the enthalpy relaxation of the pressure-jump and temperature-jump glasses of 1-propanol and 3-methylpentane was investigated by using an previous high-pressure calorimeter shich cannot measure volume of sample. from the analysisi on the effective relaxation times, clear difference between the structural relaxations of pressure-jump and temperature-jump glasses was found for the first time.

本文介绍了一种能同时测量高压下样品焓和体积的绝热量热计，其焓的测量方法与常压下常用的绝热量热计相似。圆柱形样品池非常重（650 g），由铜铍合金制成，以保持内部压力。通过测量安装在池内的波纹管的长度，可以获得样品体积。磁体位于低温恒温器外部，用不锈钢棒连接到波纹管的顶部。波纹管的长度可以通过用分辨率为0.1 μ m的磁体传感器测量磁体的位置来确定。量热计的温度和压力范围分别为100-375 K和0-200 MPa。温度测量的温度和压力范围为100 nK，压力控制的精度为1 kPa（0.01 bar），空电池的热容测量精度为0.02%。对被选为标准材料的水的测试测量显示出热容量（0.2%）和体积（1x 19 ^ %）的优异精度<-5>。作为同时测量结构弛豫的初步实验，我们利用以前不能测量样品体积的高压量热计研究了1-丙醇和3-甲基戊烷的压力跃变和温度跃变玻璃的焓弛豫。通过对有效弛豫时间的分析，首次发现了压力跃变玻璃和温度跃变玻璃的结构弛豫有明显的区别。