Influence of lattice size and symmetric property of ANbO3 (perovskite type) block on the formation of AnNbn+3mO3n+3m[(ANbO3)n(N bO)3m] (A = Ba, Sr)

Iwasaki Kota, Takizawa Hirotsugu, Ueda Kyota, Yamane Hisanori, Shimada Masahiko, Endo Tadashi

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The factors which influence the formation of layer structured AnNbn+3mO3n+3m [(ANbO3)n(NbO)3m] (A = Ba, Sr), consisting of m-NbO blocks and n-ANbO3 (perovskite type) blocks, were discussed. In the BanNbn+3mO3n+3m system, compounds with a larger value of n/m ratio were synthesized at lower temperature than that with a smaller value of n/m ratio. Lattice constant of a-axis of these compounds decreased with increasing n/m ratio (Ba2Nb5O9 (n/m = 2/1) [a = 0.4172 nm], BaNb4O6 (n/m = 1/1) [a = 0.4182 nm], BaNb7O9 (n/m = 1/2) [a = 0.4195 nm]). This tendency was also the same for the SrnNbn+3mO3n+3m system (Sr2Nb5O9 (n/m = 2/1) [a = 0.4141 nm], Sr2Nb8O12 (n/m = 2/2) [a = 0.4166 nm]). On the other hand, when the amount of Ca substitution for Ba or Sr increased, (Ba, Ca) Nb4O6 (n/m = 1/1) and (Sr, Ca)2Nb8O12 (n/m = 2/2) were formed instead of (A, Ca)2Nb5O9 (n/m = 2/1) at 1573 and 1673 K, respectively. These different tendencies can be explained in terms of matching of NbO block and ANbO3 block. Not only the difference of lattice sizes between NbO block and ANbO3 block, but also the symmetric property in ANbO3 block have large effects on the formation of AnNbn+3mO3n+3m.

本文言語English
ページ(範囲)1023-1027
ページ数5
ジャーナルJournal of the Ceramic Society of Japan
109
1276
DOI
出版ステータスPublished - 2001 12

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

フィンガープリント

「Influence of lattice size and symmetric property of ANbO<sub>3</sub> (perovskite type) block on the formation of A<sub>n</sub>Nb<sub>n+3m</sub>O<sub>3n+3m</sub>[(ANbO<sub>3</sub>)<sub>n</sub>(N bO)<sub>3m</sub>] (A = Ba, Sr)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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