尿素夹层二硫化钛化合物的合成及其热、电输运性质研究(英文)  

THE SYNTHESIS AND THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF TiS_2 INTERCALATED BY UREA

作　　者：张建[1] 秦晓英[1] 董华泽[1] 李地[1] 辛红星[1] 宋春军[1] 

机构地区：[1]中国科学院固体物理研究所材料物理重点实验室,合肥230031

出　　处：《低温物理学报》2012年第2期94-100,共7页Low Temperature Physical Letters

基　　金：Pprject Suppord by the National Natural Science Foundation of China(Nos.10904144,50972146)~~

摘　　要：我们成功的制备出了含不同成分尿素的夹层化合物(NH2CONH2)xTiS2,并研究了它们在低温(5～310K)下的热、电输运性质.夹层后晶格常数、热、电输运行为的变化也证实了尿素分子成功的夹层到TiS2的范德华尔斯层间.研究结果表明:尿素分子的夹层成功的降低了材料的热导率,特别是在浓度为12.5mmol/L尿素的苯溶液中合成的样品的热导率大约1.5Wm-1 K-1(仅为纯TiS2的50%),而且尿素分子的夹层使得材料在低温下的导电行为从金属性转变为半导体性.The thermal and electrical properties of intercalated compounds （NH2 CONH2）xTiS2 synthesized using a combined process of solid state reaction and moist chemical method have been investigated in temperature range 5 -310K. The changes of lattice constants （a and c）, thermal and electrical behavior after intercalation could confirm urea molecules have been intercalated into van der Waals gaps of TiS2 successfully. The results indicate that urea in- tercalation leads to substantial decrease of thermal conductivity, the thermal conductivity of that sample （synthesized in 12. 5 mmol/L benzene solution of urea） about 1.5 W（m-IK-1 （only 50% of pure TiS2） at room temperature. We also find that their DC resistivities show semiconductor behavior at low temperature due to the intercalation of urea molecules.

关 键 词：热导率 夹层 TiS2 

分 类 号：O614.411[理学—无机化学]