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Influence of Metal Ions on the Order‐Disorder Transition Temperature of the Ba‐M‐O (M: La, Y, In, or Ga) System
Author(s) -
Mitamura Takashi,
Ogino Hiroyuki,
Kobayashi Hidehiko,
Mori Toshiyuki,
Yamamura Hiroshi
Publication year - 1993
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.1151-2916.1993.tb08347.x
Subject(s) - ionic radius , sintering , ion , materials science , transition metal , perovskite (structure) , ionic bonding , crystallography , analytical chemistry (journal) , metal , mineralogy , chemistry , metallurgy , catalysis , biochemistry , organic chemistry , chromatography
Preparation of BaLa 2 O 4 , B a3 ,Y 4 O 9 , B a ,In 2 O 5 , and Ba 3 Ga 2 O 6 powders and their sintering were investigated in Ar or air. These sintered bodies with perovskite‐related structure were synthesized by reaction sintering, using mixed powders in the atomic ratios of Ba/La = 1, Ba/Y = 0.75, Ba/In = 1, and Ba/Ga = 1.5. The order‐disorder transition temperatures of the BaLa 2 O 4 , Ba 3 Y 4 O 9 , Ba 2 In 2 O 5 , and Ba 3 Ga 2 O 6 sintered bodies were 270°, 350°, 880°, and 123O o C, respectively. It was found that the temperatures were influenced by the ionic radius of cations in B sites, and the transition temperatures decreased with increasing ionic radius.