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Effects of Microstructure on the Dielectric and Piezoelectric Properties of Lead Metaniobate
Author(s) -
Lee Ho Sung,
Kimura Toshio
Publication year - 1998
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.1151-2916.1998.tb02760.x
Subject(s) - materials science , sintering , microstructure , dielectric , piezoelectricity , ceramic , tetragonal crystal system , orthorhombic crystal system , composite material , grain size , phase (matter) , curie temperature , mineralogy , crystal structure , condensed matter physics , crystallography , chemistry , optoelectronics , physics , organic chemistry , ferromagnetism
In an attempt to obtain dense PbNb 2 O 6 ceramics, sintering experiments were conducted using starting powders with various particle sizes and different modifications (rhombohedral and orthorhombic structures). During sintering of rhombohedral powders, the phase transformation to the tetragonal phase promoted grain growth, resulting in poor densification. Sintering of orthorhombic powders, however, yielded dense ceramics through suppression of the phase transformation. Based on these results, ceramics with various densities and different microstructures were prepared, and their dielectric and piezoelectric properties were evaluated. The dielectric constant and Curie temperature were dependent on density, grain size, and crack density. Cracks and intragrain pores severely deteriorated the piezoelectric properties. Dense ceramics with the maximum coupling factors and piezoelectric strain constants were obtained by prolonged heating of a fine powder with orthorhombic structure.