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Preparation of Potassium Tantalate Niobate by Sol–Gel Method
Author(s) -
Hirano Shinichi,
Yogo Toshinobu,
Kikuta Koichi,
Morishita Toshiyuki,
Ito Yasuhiro
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.tb04252.x
Subject(s) - tantalate , potassium niobate , pyrochlore , materials science , perovskite (structure) , alkoxide , calcination , crystallization , sol gel , potassium , ferroelectricity , mineralogy , chemical engineering , inorganic chemistry , crystallography , chemistry , nanotechnology , phase (matter) , organic chemistry , metallurgy , optoelectronics , catalysis , dielectric , engineering
Perovskite potassium tantalate niobate (KTN) powders and thin films were synthesized from a metal alkoxide solution. Homogeneous KTN coating solutions were prepared from KOC 2 H 5 , Ta(OC 2 H 5 ) 5 , and Nb(OC 2 H 5 ) 5 in absolute ethanol. The precursor crystallized to pyrochlore at ∼ 650°C, and then to perovskite at ∼ 750°C, depending upon Ta:Nb ratio. H 2 O vapor during calcination was found to play a prominent role in the direct and predominant crystallization of perovskite films with preferred orientation. Highly oriented KTN films of perovskite structure were successfully prepared on MgO (100) substrates at 675°C.