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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=0.4172nm], BaNb4O6 (n/m=1/1) [a=0.4182nm], BaNb7O9 (n/m=1/2) [a=0.4195nm]). This tendency was also the same for the SrnNbn+3mO3n+3m system (Sr2Nb5O9 (n/m=2/1) [a=0.4141nm], Sr2Nb8O12 (n/m=2/2) [a=0.4166nm]). 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 1673K, 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.

Influence of Lattice Size and Symmetric Property of ANbO3 (Perovskite Type) Block on the Formation of AnNbn+3mO3n+3m[(ANbO3)n(NbO)3m] (A=Ba, Sr).