Low temperature synthesis of the microwave dielectric Bi 2O 3 MgO Nb 2O 5 nano powders by metal-citrate method

• Published in: Journal of alloys and compounds Vol. 413; no. 1; pp. 188 - 192
• Main Authors: Shim, Seung Hwan, Yoon, Jong-Won, Shim, Kwang Bo, Matsushita, Jun-ichi, Hyun, Buh Sung, Kang, Seung Gu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2006
• Subjects: BMN; Metal-citrate process; Nanopowders; Spark plasma sintering; BMN; Spark plasma sintering; Metal-citrate process; Nanopowders
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2005.03.116

The microwave dielectric (Bi 1.5Mg 0.5)(Mg 0.5Nb 1.5) (BMN) nano powders were synthesized by the metal-citrate process and their sintering behaviors were evaluated. The single phase of cubic pyrochlore was achieved at the low temperature of 600 °C for 3 h, together with the complete decomposition of the residual organic compounds. Increasing heating temperature led to the particle growth, indicating that crystallite size of the powders synthesized at 600 °C was 16 nm, increasing to 34 nm for a heating at 700 °C and 45 nm for a heating at 800 °C, respectively. The BMN nano powders obtained at 600 °C could be fully densified at low temperature of 850 °C by a spark plasma sintering, showing the uniform microstructure.