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Low-Temperature Sintering of Apatite-Type Lanthanum Silicate with Fluoride Additives

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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/
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)
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)

Submitter: 高橋 順一

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