期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 4, 页码 1509-1516出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.12.014
关键词
Perovskites; Barium iron niobate; Ceramics; Magnetism; Permittivity; Nano-particles
资金
- German Research Foundation within the Collaborative Research Centre [SFB 762]
A facile method to prepare nanoscaled BaFe(0.5)Nba(0.5) O-3 via synthesis in boiling NaOH solution is described herein. The nano-crystalline powder has a high specific surface area of 55 m(2) g(-1) and a crystallite size of 15 nm. The as-prepared powder does not show any significant crystallite growth up to 700 C-o. The activation energy of the crystallite growth process was calculated as 590 kJ mol(-1). Dense ceramics can be obtained either after sintering at 1200 C-o for 1 h or after two-step sintering at 1000 C-o for 10 h. The average grain sizes of ceramic bodies can be tuned between 0.23 p.m and 12 p.m. The thermal expansion coefficient was determined as 11.4(3).10-6 K-1.The optical band gap varies between 2.90(5) and 2.63(3) eV. Magnetic measurements gave a Neel temperature of 20 K. Depending on the sintering regime, the ceramic samples reach permittivity values between 2800 and 137,000 at RT and 1 kHz. (C) 2016 Elsevier Ltd. All rights reserved.
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