The crystal structures and physical properties of the solid solution compound Ba5Y8-xMn4O21-1.5x (x=0, 1)

doi:10.1088/1674-1056/21/6/066102

Abstract New oxometallides with the formula Ba₅Y_8-xMn₄O_21-1.5x (x=0, 1) are prepared through an atmosphere-controlled solid-state reaction. Two single-phase samples with Ba/Y/Mn atomic ratios 5/8/4 (Y8) and 5/7/4 (Y7) are obtained. The crystal structures and the physical properties of the compounds are investigated by X-ray powder diffraction, magnetization, conductivity, and dielectricity measurements. The Ba₅Y_8-xMn₄O_21-1.5x compound is demonstrated to be a Y-deficient solid solution. The solid solution compound Ba₅Y_8-xMn₄O_21-1.5x crystallizes into tetragonal symmetry with the space group I4/m. Detailed structure analysis by Rietveld refinement of the X-ray powder diffraction data reveals that the Y vacancies occur preferentially at the Y(2) site. Thermal magnetization measurements indicate the presence of antiferromagnetic interaction between Mn ions in the compounds, and temperature-dependent resistivity measurements show that insulator-semiconductor transitions occur around 175 K and 170 K for the Y8 and Y7 samples, respectively. Strong frequency dependences of the dielectric constant are observed above ～ 175 K for the two compounds.

Keywords: Ba₅Y_8-xMn₄O_21-1.5x X-ray powder diffraction crystal structure conductivity

Received: 21 December 2011
Revised: 09 February 2012
Accepted manuscript online:

PACS:	61.05.cp	(X-ray diffraction)
	91.60.Ed	(Crystal structure and defects, microstructure)
	72.20.-i	(Conductivity phenomena in semiconductors and insulators)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50872148 and 51072225) and the National Basic Research Program of China (Grant No. 2007CB925003).

Corresponding Authors: Li Jing-Bo, Liang Jing-Kui
E-mail: jbli@iphy.ac.cn; jkliang@iphy.ac.cn

Cite this article:

Gao Qing-Qing(高庆庆), Li Jing-Bo(李静波), Song Shi-Jia(宋士佳), Rao Guang-Hui(饶光辉), Luo Jun(骆军), Liu GuangYao(刘广耀), and Liang Jing-Kui(梁敬魁) The crystal structures and physical properties of the solid solution compound Ba₅Y_8-xMn₄O_21-1.5x (x=0, 1) 2012 Chin. Phys. B 21 066102

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The crystal structures and physical properties of the solid solution compound Ba5Y8-xMn4O21-1.5x (x=0, 1)

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The crystal structures and physical properties of the solid solution compound Ba₅Y_8-xMn₄O_21-1.5x (x=0, 1)