Hydrothermal Synthesis, Structure Characterization and Magnetic Studies of Perovskite-type Fluorides K2NaVF6 and (NH4)3VF6

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (3): 371-374.

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Hydrothermal Synthesis, Structure Characterization and Magnetic Studies of Perovskite-type Fluorides K₂NaVF₆ and (NH₄)₃VF₆

HE Li-jie¹, ZHANG Dong², FENG Shou-hua³, CHEN Gang², ZOU Bo²

1. College of Chemistry, Yingkou University Zone, Yingkou 115000, P. R. China;
2. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, P. R. China;
3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received:2011-11-07 Revised:2011-12-20 Online:2012-05-25 Published:2012-05-03
Contact: ZHANG Dong E-mail:dongzhang@jlu.edu.cn
Supported by:
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) and the Open Project of State Key Laboratory of Superhard Materials(No.2011-04), China.

Abstract

Abstract: Two perovskite-type fluorides K₂NaVF₆ and (NH₄)₃VF₆ were synthesized under mild hydrothermal conditions. The structures of the compounds were determined by means of powder X-ray diffraction analysis. The Rietveld 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) nm. The compounds were further characterized by scanning electron microscopy( 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 ordering is related to the crystallographic features and isolated magnetic unit with the temperature decreasing.

Key words: Hydrothermal, Fluoride, Perovskite-type, Magnetic property

HE Li-jie, ZHANG Dong, FENG Shou-hua, CHEN Gang, ZOU Bo. Hydrothermal Synthesis, Structure Characterization and Magnetic Studies of Perovskite-type Fluorides K₂NaVF₆ and (NH₄)₃VF₆[J]. Chemical Research in Chinese Universities, 2012, 28(3): 371-374.

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Hydrothermal Synthesis, Structure Characterization and Magnetic Studies of Perovskite-type Fluorides K₂NaVF₆ and (NH₄)₃VF₆

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