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Crystallization of Hexagonal BaNb 2 O 6
Author(s) -
YAMAGUCHI OSAMU,
MATSUI KAZUHIRO,
SHIMIZU KIYOSHI
Publication year - 1985
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1985.tb10163.x
Subject(s) - crystallization , hexagonal crystal system , niobium , octahedron , crystallography , activation energy , barium , amorphous solid , natural bond orbital , materials science , mineralogy , crystal structure , chemistry , thermodynamics , metallurgy , physics , computational chemistry , density functional theory
Pure hexagonal BaNb 2 O 6 crystallizes at 640° to 700°C from an amorphous material prepared by simultaneous hydrolysis of barium and niobium alkoxides. The structure is characterized by layer networks of NbO 6 octahedra. Crystallization isotherms are described by the Avrami equation In (1—f) = ‐kt n with n=2; the activation energy is 268 kJ‐mol‐'. Hexagonal BaNb 2 O 6 transforms to the ortho‐rhombic modification one at 12.50° to 1310°C.