Order-disorder phase formation in the complex perovskite compounds Ba(Ni{sub 1/3}Nb{sub 2/3})O{sub 3} and Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3}

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08098.x· OSTI ID:422729

Hong, K S ^[1]; Kim, I T; Kim, C D ^[2]

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1. Seoul National Univ. (Korea, Republic of). Dept. of Inorganic Materials Engineering
2. Korea Inst. of Science and Technology, Seoul (Korea, Republic of). Ceramics Div.

The order-disorder phase formation of the complex perovskite compounds Ba(Ni{sub 1/3}Nb{sub 2/3})O{sub 3} (BNN) and Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3} (BZN) was investigated using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The BNN and BZN samples were sintered over a temperature range of 1,200 to 1,500 C in air for 2 h. X-ray diffraction and transmission electron microscopy showed that these compounds exhibited a 1:2 ordering on the B-site within a narrow temperature range. When BNN and BZN were sintered above 1,400 and 1,350 C, respectively, a liquid phase formed in the grain boundary which was accompanied by disordering. The composition of the liquid phase resembled that of pyrochlore, with a small amount of nickel for BNN or zinc for BZN. The disordering with the formation of the liquid phase was attributed to the increase in defect concentration.

• Sponsoring Organization: USDOE
• OSTI ID: 422729
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCINATION
EXPERIMENTAL DATA
MILLING
NICKEL OXIDES
NIOBIUM OXIDES
ORDER-DISORDER TRANSFORMATIONS
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
SINTERING
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
ZINC OXIDES