{"title":"kmgcl3·6h2o单晶的热力学性质和结构几何","authors":"H. Yoon, A. Lim","doi":"10.6564/JKMRS.2015.19.3.119","DOIUrl":null,"url":null,"abstract":"The thermodynamic properties and structural geometry of KMgCl 3 ·6H 2 O were investigated using thermogravimetric analysis, differential scanning calorimetry, and nuclear magnetic resonance. The initial mass loss occurs around 351 K (=T d ), which is interpreted as the onset of partial thermal decomposition. Phase transition temperatures were found at 435 K (=T C1 ) and 481 K (=T C2 ). The temperature dependences of the spin–lattice relaxation time T 1 for the 1 H nucleus changes abruptly near T C1 . These changes are associated with changes in the geometry of the arrangement of octahedral water molecules.","PeriodicalId":17414,"journal":{"name":"Journal of the Korean magnetic resonance society","volume":"19 1","pages":"119-123"},"PeriodicalIF":0.4000,"publicationDate":"2015-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Thermodynamic properties and structural geometry of KMgCl 3 ·6H 2 O single crystals\",\"authors\":\"H. Yoon, A. Lim\",\"doi\":\"10.6564/JKMRS.2015.19.3.119\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The thermodynamic properties and structural geometry of KMgCl 3 ·6H 2 O were investigated using thermogravimetric analysis, differential scanning calorimetry, and nuclear magnetic resonance. The initial mass loss occurs around 351 K (=T d ), which is interpreted as the onset of partial thermal decomposition. Phase transition temperatures were found at 435 K (=T C1 ) and 481 K (=T C2 ). The temperature dependences of the spin–lattice relaxation time T 1 for the 1 H nucleus changes abruptly near T C1 . These changes are associated with changes in the geometry of the arrangement of octahedral water molecules.\",\"PeriodicalId\":17414,\"journal\":{\"name\":\"Journal of the Korean magnetic resonance society\",\"volume\":\"19 1\",\"pages\":\"119-123\"},\"PeriodicalIF\":0.4000,\"publicationDate\":\"2015-12-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the Korean magnetic resonance society\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.6564/JKMRS.2015.19.3.119\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"BIOCHEMICAL RESEARCH METHODS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Korean magnetic resonance society","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.6564/JKMRS.2015.19.3.119","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMICAL RESEARCH METHODS","Score":null,"Total":0}
引用次数: 0
摘要
采用热重分析、差示扫描量热法和核磁共振等方法研究了kmgcl3·6h2o的热力学性质和结构几何形状。初始质量损失发生在351 K (=T d)左右，这被解释为部分热分解的开始。相变温度分别为435 K (=T C1)和481 K (=T C2)。氢原子核的自旋-晶格弛豫时间t1的温度依赖性在t1附近突然改变。这些变化与八面体水分子排列的几何变化有关。
Thermodynamic properties and structural geometry of KMgCl 3 ·6H 2 O single crystals
The thermodynamic properties and structural geometry of KMgCl 3 ·6H 2 O were investigated using thermogravimetric analysis, differential scanning calorimetry, and nuclear magnetic resonance. The initial mass loss occurs around 351 K (=T d ), which is interpreted as the onset of partial thermal decomposition. Phase transition temperatures were found at 435 K (=T C1 ) and 481 K (=T C2 ). The temperature dependences of the spin–lattice relaxation time T 1 for the 1 H nucleus changes abruptly near T C1 . These changes are associated with changes in the geometry of the arrangement of octahedral water molecules.
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