{"title":"X-Ray Study of Phase Transition in NaNO 3","authors":"H. Terauchi, Y. Yamada","doi":"10.1143/JPSJ.33.446","DOIUrl":null,"url":null,"abstract":"The phase transition of NaNO 3 crystal associated with the ordering of the orientation of NO 3 - ion has been investigated by X-ray scattering. The experimental results have been analyzed on a microscopic basis to obtain pair interactions between NO 3 - ions. The results are summarized as follows. (i) The ellipsoidal distribution of critical diffuse scattering in the reciprocal space is explained by taking the pair interactions up to second nearest neighbours. (ii) The temperature dependence of critical scattering gives a reasonable agreement with theoretical values in random phase approximation in the temperature range of T > T c +4.5 K. (iii) Both the temperature dependence of long range order parameter and of anomalous lattice expansion can be satisfactorily explained by taking the strain dependence of pair interaction energy into account.","PeriodicalId":269857,"journal":{"name":"Tokyo Sugaku Kaisya Zasshi","volume":"28 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1972-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"24","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tokyo Sugaku Kaisya Zasshi","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1143/JPSJ.33.446","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 24
Abstract
The phase transition of NaNO 3 crystal associated with the ordering of the orientation of NO 3 - ion has been investigated by X-ray scattering. The experimental results have been analyzed on a microscopic basis to obtain pair interactions between NO 3 - ions. The results are summarized as follows. (i) The ellipsoidal distribution of critical diffuse scattering in the reciprocal space is explained by taking the pair interactions up to second nearest neighbours. (ii) The temperature dependence of critical scattering gives a reasonable agreement with theoretical values in random phase approximation in the temperature range of T > T c +4.5 K. (iii) Both the temperature dependence of long range order parameter and of anomalous lattice expansion can be satisfactorily explained by taking the strain dependence of pair interaction energy into account.
用x射线散射法研究了纳米3晶体的相变与no3离子取向顺序的关系。对实验结果进行了微观分析,得到了no3 -离子之间的对相互作用。结果总结如下:(i)临界漫射散射在互易空间中的椭球分布是通过取到第二近邻的对相互作用来解释的。(ii)临界散射的温度依赖性与随机相位近似的理论值在T > T c +4.5 k的温度范围内有较好的一致性。(iii)考虑到对相互作用能的应变依赖性,可以很好地解释远程序参量和反常晶格展开的温度依赖性。