Hydrothermal Synthesis,Structure Characterization and Magnetic Studies of Perovskite-type Fluorides K_2 NaVF_6 and(NH_4)_3VF_6  

作　　者：HE Li-jie ZHANG Dong FENG Shou-hua CHEN Gang ZOU Bo 

机构地区：[1]College of Chemistry,Yingkou University Zone,Yingkou 115000,P.R.China [2]State Key Laboratory of Superhard Materials,College of Physics [3]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changehun 130012,P.R.China

出　　处：《Chemical Research in Chinese Universities》2012年第3期371-374,共4页高等学校化学研究（英文版）

基　　金：Supported by the Science and Technology Development Planning of Jilin Province,China(Nos.20100116,201105005);the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20100061120089);the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry(No.2011-01);the Open Project of State Key Laboratory of Superhard Materials(No.2011-04),China

摘　　要：Two perovskite-type fluorides K2NaVF6 and （NH4）3VF6 were synthesized under mild hydrothermal con- ditions. The structures of the compounds were determined by means of powder X-ray diffraction analysis. The Riet- veld refinement indicates that K2NaVF6 has a cubic elpasolite-type structure and crystallizes in space group Fm3m with lattice constant a=8.3180（2） nm. （NH4）3VF6 has a cubic cryolite-type structure and crystallizes in space group Fm3m with lattice parameter a=9.090（1） rim. The compounds were further characterized by scanning electron micro- scopy（SEM）, thermogravimetric（TG） and differential thermal analysis（DTA）. The variable temperature magnetic susceptibility of these two compounds was characterized for the first time and the result shows that the magnetic or- dering is related to the crystallographic features and isolated magnetic unit with the temperature decreasing.Two perovskite-type fluorides K2NaVF6 and （NH4）3VF6 were synthesized under mild hydrothermal con- ditions. The structures of the compounds were determined by means of powder X-ray diffraction analysis. The Riet- veld refinement indicates that K2NaVF6 has a cubic elpasolite-type structure and crystallizes in space group Fm3m with lattice constant a=8.3180（2） nm. （NH4）3VF6 has a cubic cryolite-type structure and crystallizes in space group Fm3m with lattice parameter a=9.090（1） rim. The compounds were further characterized by scanning electron micro- scopy（SEM）, thermogravimetric（TG） and differential thermal analysis（DTA）. The variable temperature magnetic susceptibility of these two compounds was characterized for the first time and the result shows that the magnetic or- dering is related to the crystallographic features and isolated magnetic unit with the temperature decreasing.

关 键 词：HYDROTHERMAL FLUORIDE PEROVSKITE-TYPE Magnetic property 

分 类 号：O643.36[理学—物理化学] TQ424.25[理学—化学]