Publication Date:
2014-02-05
Description:
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.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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