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Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO 3
Author(s) -
Shimizu Hiroyuki,
Kobayashi Keisuke,
Mizuno Youichi,
Randall Clive A.
Publication year - 2014
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/jace.12815
Subject(s) - sintering , calcination , materials science , ceramic , dielectric , partial pressure , volatility (finance) , oxygen , mineralogy , natural bond orbital , ferroelectricity , alkali metal , analytical chemistry (journal) , chemical engineering , composite material , chemistry , density functional theory , optoelectronics , chromatography , organic chemistry , biochemistry , computational chemistry , financial economics , engineering , economics , catalysis
This work focused on the processing of low oxygen partial pressure (low‐ p O 2 ) calcination and sintering with respect to NaNbO 3 ( NN ) of one key member in ferroelectric (Na,K)NbO 3 . The high‐density NN ceramics were successfully prepared without any sintering additives using the low‐ p O 2 process. Comparing conventional air process, the low‐ p O 2 calcined NN powders showed lower defect concentration and higher densification. The low‐ p O 2 sintered NN ceramics had dielectric constant and dielectric loss performance at high temperatures. Furthermore, the low‐ p O 2 sintered NN ceramics indicated ferroelectric behavior, and both maximum polarization and strain improved to two to three times that of conventional air‐sintered NN ceramics. From this relatively simple compound, NN , the advantage of low‐ p O 2 is unambiguously demonstrated and points to its consideration. It is hypotheses as a kinetically controlled process that limits the volatility under low‐ p O 2 condition.