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Sol–Gel Synthesis of Strontium Pyroniobate and Calcium Pyroniobate
Author(s) -
Prasadarao Alamanda V.,
Selvaraj Ulagaraj,
Komarneni Sridhar,
Bhalla Amar S.
Publication year - 1992
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.1151-2916.1992.tb05491.x
Subject(s) - strontium , crystallization , materials science , sintering , calcium , perovskite (structure) , grain growth , grain size , niobium , mineralogy , pellets , phase (matter) , sol gel , chemical engineering , crystallography , chemistry , metallurgy , composite material , nanotechnology , organic chemistry , engineering
Strontium and calcium pyroniobates were prepared by a sol–gel process, using strontium/calcium metal and niobium ethoxide as precursors. The formation of Sr 2 Nb 2 O 7 occurred at 750°C via an intermediate perovskite phase of composition close to Sr 0.82 NbO 3 . The crystallization of Ca 2 Nb 2 O 7 occurred at 600°C directly without any intermediate phases. Sintered Sr 2 Nb 2 O 7 and Ca 2 Nb 2 O 7 pellets showed a preferred grain orientation. Microstructural studies revealed an increase in grain growth and associated orientation with sintering temperature.