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

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Abstract

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.

Original languageEnglish
Pages (from-to)1023-1027
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume109
Issue number1276
DOIs
Publication statusPublished - 2001 Dec

Keywords

  • ANbO
  • BaNbO
  • BaNbO
  • Ca doping
  • Layer structure
  • NbO
  • Perovskite type
  • SrNbO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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