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Low-Temperature Sintering of Apatite-Type Lanthanum Silicate with Fluoride Additives
Title: | Low-Temperature Sintering of Apatite-Type Lanthanum Silicate with Fluoride Additives |
Authors: | Takahashi, Junichi Browse this author →KAKEN DB | Honda, Hidetoshi Browse this author | Akashi, Takaya Browse this author | Abe, Kazutomo Browse this author | Itoh, Hidenobu Browse this author | Kishi, Masami Browse this author |
Keywords: | Lanthanum silicate | Fluoride additives | Low-temperature sintering | Oxide ion conduction |
Issue Date: | 2010 |
Publisher: | Trans Tech Publications |
Journal Title: | Advances in Science and Technology |
Volume: | 62 |
Start Page: | 235 |
End Page: | 240 |
Publisher DOI: | 10.4028/www.scientific.net/AST.62.235 |
Abstract: | Various fluorides (3 - 8 wt%) were added to a La9.33Si6O26 (LSO) powder synthesized by calcining the corresponding oxides mixture at 1100ºC for 4 h. The addition of BaF2, AlF3 or Ba3Al2F12 caused an appreciable and substantial increase in bulk density after sintering at 1400º and 1450ºC, respectively. These fluorides melt below 1400ºC to form liquid phase which could assist the densification at low temperatures. Abnormal grain growth was observed for LSO samples with the addition of AlF3 and Ba3Al2F12, but it was effectively suppressed by stepwise sintering at 1400º and 1450ºC. The BaF2 addition brought about the simultaneous promotion of densification and moderate grain growth, leading to the production of a densified LSO sample showing a conductivity of 1.5 x 10–2 Scm–1 at 800ºC with an activation energy of 1.23 eV. |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/57397 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 高橋 順一
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