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Low Temperature Equipment for Four Circle Diffractometer Developed by Using Small Closed-Cycle Integral Stirling Engine

采用小型闭环整体斯特林发动机研制的四环衍射仪低温设备

基本信息

批准号：
06555180
负责人：
OHBA Takuya
金额：
$ 4.61万
依托单位：
TEIKYO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

Since the phase transformation plays an important role in materials science, the study of the phase transformation becomes important. The structural study of the phase transformation is fundamental and important subject. One of the useful equipment for the structural study is the four circle diffractometer. It is very useful for determining the crystal structure of new materials and also for studying the mechanism of the transformation. Nowadays two types of low temperature equipment are widely used for the four circle diffractometer. One is the blowing N<@D22@>D2 gas type and another is the thermal cycling type. The former one is conventional, but has problems such as a lot of consumption of liquid N<@D22@>D2 and a non-uniform temperature around the sample. The latter one has been used and produced a lot of useful information. However, we need a large and special four circle diffractometer for supporting the latter type of the low temperature equipment. To solve those problem, we have … More developed the small low temperature equipment by using small closed-cycle integral stirling engine. The micro- cooler produced by Inframetrics, Inc.was used for cooling apparatus. The equipment is divided into three parts, that is, the connecting part to the four circle diffractometer, cooling apparatus and the chamber. The sample is placed into the chamber which has Be windows to transmit the x-ray. The temperature reached was 117K (-156ﾟC) close to the sample and can be obtained within 30 minutes. The stability of the temperature is whthin (]SY.+-。[)1.5K at the reached temperature. The deviation of the temperature will be improved after adjustment of temperature controller. The Laue photos were taken and several measurements were tried with the equipment mounted on the four circle diffractometer. Although there remain some problems to be solved for the conventional use, the development of this small low temperature equipment will promote the possibility of low temperature x-ray experiment. Less

相变在材料科学中占有重要地位，因此对相变的研究变得十分重要。相变的结构研究是一门基础而重要的学科。四圆衍射仪是结构研究中有用的仪器之一。这对确定新材料的晶体结构和研究相变机理具有重要意义。目前四圆衍射仪广泛采用两种低温设备。一种是吹N<@D22@>D2气体型，另一种是热循环型。前者是常规的，但存在大量液体N<@D22@>D2的消耗和样品周围温度不均匀等问题。后一种方法已经得到了应用，并产生了许多有用的信息。但是，我们需要一个大而特殊的四圆衍射仪来支持后一种低温设备。为了解决这些问题，我们进一步开发了小型闭式循环整体斯特林发动机的小型低温设备。采用Inframetrics公司生产的微型冷却器作为冷却设备。该设备分为三部分，即与四圆衍射仪、冷却装置和腔室的连接部分。样品被放置在有5个窗口来透射x射线的腔室中。达到的温度为117K (-156 C)，接近样品，30分钟内即可得到。在达到的温度下，温度的稳定性在（]SY.+- - [）1.5K以内。调整温控器后，温度的偏差将得到改善。用安装在四圆衍射仪上的设备拍摄了劳厄照片，并进行了几次测量。虽然常规使用还存在一些问题需要解决，但这种小型低温设备的研制将促进低温x射线实验的可能性。少