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Combustion synthesis and characterization of nanocrystalline Ba(Mg1/3Nb2/3)O3 powders

✍ Scribed by Zhongqing Tian; Lin Lin; Fancheng Meng; Weijiu Huang

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
436 KB
Volume
158
Category
Article
ISSN
0921-5107

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✦ Synopsis

Nanocrystalline Ba(Mg 1/3 Nb 2/3 )O 3 (BMN) powders were successfully synthesized through a modified combustion synthesis method by using Ba(NO 3 ) 2 , Mg(NO 3 ) 3 β€’6H 2 O and Nb 2 O 5 as starting materials. Gel precursor and calcined powders were characterized by thermogravimetric (TG), differential scanning calorimetry (DSC), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The results demonstrate that pure perovskite Ba(Mg 1/3 Nb 2/3 )O 3 powder formed at 800 β€’ C for 2 h. And the crystallite size was about 40 nm. The specimen sintered at 1550 β€’ C for 12 h shows 96.3% of the theoretical density and gave the excellent microwave dielectric properties: Ξ΅ r = 31.3 and Qf = 71,800 GHz.

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