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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/23619

Title: Properties of Hexagonal Ba(Ti1-xMnx)O3 Ceramics: Effects of Sintering Temperature and Mn Content
Authors: Sea-Fue Wang;Yu-Chuan Wu;Ya-Chi Hsu;Jinn P. Chu;Cheng-Hui Wu
Contributors: NTOU:Institute of Materials Engineering
Keywords: microstructure;barium titanate;hexagonal;microwave properties
Date: 2007
Issue Date: 2011-10-20T08:06:48Z
Publisher: Japanese Journal of Applied Physics
Abstract: Abstract:The effects of sintering conditions on the densification, microstructural evolution and microwave properties of Ba(Ti1-xMnx)O3 ceramics were investigated in this study. For x≦0.25, densification is achieved at a temperature as low as 1250 °C. For x> 0.25, a significant densification starts only at temperatures above 1350 °C, owing to the existence of a Ba2Ti5O12 phase. X-ray photoelectron spectroscopy results manifest a change in the chemical state of Mn from Mn2+ to Mn4+ when the Mn content in the Ba(Ti1-xMnx)O3 ceramics is increased. A ≈0.9 wt % weight gain is obtained when Ba(Ti0.85Mn0.15)O3 powder is heated to 1500 °C, presumably owing to the transformation of Ba(Ti0.85Mn0.15)O2.85 to Ba(Ti0.85Mn0.15)O3, associated with the conversion of Mn2+ to Mn4+ as temperature increases. The microstructural evolution and microwave dielectric properties of the Ba(Ti1-xMnx)O3 ceramics are also affected by sintering temperature and Mn content. For Ba(Ti0.85Mn0.15)O3 ceramics, as a typical example, εr varies from 52 to 60 and Q·fr changes from 2,000 to 12,000 as sintering temperature increases from 1200 to 1500 °C. However, τf ranges from 200 to 250 ppm/°C, which is independent of sintering temperature.
Relation: 46(5A), pp.2978-2983
URI: http://ntour.ntou.edu.tw/handle/987654321/23619
Appears in Collections:[材料工程研究所] 期刊論文

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