Synthesis, structure and antiferromagnetic behaviour of brannerite MnV2O6

doi:10.1088/1674-1056/19/6/067503

Abstract Brannerite MnV₂O₆ with plate-like shape is successfully synthesized by hydrothermal method. Its crystal structure and morphology are investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), high resolution transmission electron microscopy (HRTEM) and select area electronic diffraction (SAED). The results show that the brannerite MnV₂O₆ with monoclinic structure has a uniform plate-like shape with a diameter of about 5--8 $\mu$m and a thickness of about 500 nm. SAED patterns further confirm the structure of the brannerite MnV₂O₆ and the single crystalline character of the plate crystal. Magnetic properties are measured by superconducting quantum interference device (SQUID) in a temperature range of 2--300 K under a magnetic field of 1 T. The magnetic measurement results indicate that the material undergoes an antiferromagnetic transition with a Néel temperature of 17 K. Above 50 K, the inverse susceptibility is fitted well to the Curie--Weiss law with a calculated moment of 5.98 $\mu_{\rm B}$. Finally, the origin of antiferromagnetic behaviour in the brannerite MnV₂O₆ is explained by means of Anderson model.

Keywords: brannerite MnV₂O₆ hydrothermal synthesis antiferromagnetic behaviour

Received: 29 October 2009
Accepted manuscript online:

PACS:	81.10.Dn	(Growth from solutions)
	75.50.Ee	(Antiferromagnetics)
	61.66.Fn	(Inorganic compounds)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
	75.30.Cr	(Saturation moments and magnetic susceptibilities)
	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))

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Zhou Chuan-Cang(周传仓), Liu Fa-Min(刘发民), Ding Peng(丁芃), Cai Lu-Gang(蔡鲁刚), Zhong Wen-Wu(钟文武), and Zhang Huan(张嬛) Synthesis, structure and antiferromagnetic behaviour of brannerite MnV₂O₆ 2010 Chin. Phys. B 19 067503

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Synthesis, structure and antiferromagnetic behaviour of brannerite MnV2O6

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Synthesis, structure and antiferromagnetic behaviour of brannerite MnV₂O₆