Premium
Effect of Excess PbO on the Sintering Characteristics and Dielectric Properties of Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 ‐Based Ceramics
Author(s) -
Guha Jyoti P.,
Hong Dyllan J.,
Anderson Harlan U.
Publication year - 1988
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.1151-2916.1988.tb05038.x
Subject(s) - sintering , materials science , dielectric , ceramic , analytical chemistry (journal) , ferroelectricity , phase (matter) , perovskite (structure) , solid solution , dilution , mineralogy , metallurgy , crystallography , chemistry , thermodynamics , organic chemistry , chromatography , physics , optoelectronics
Additions of excess PbO to the perovskite Pb[(Mg 1/3 Nb 2/3 ) 0.92 Ti 0.08 ]O 3 solid solution enhanced the formation of a liquid phase at 840°C, which served as a densification aid for the ceramics. The liquid phase allowed elimination of pores and promoted grain growth during sintering. With additions of 1 to 2 wt% excess PbO, densities in excess of 97% of theoretical were obtained at a sintering temperature of 950°C. The peak dielectric constants of the resulting ceramics were over 18 000 at 30°C and dissipation factors less than 1%. Additions of PbO in excess of 2 wt% resulted in inferior dielectric properties due mainly to the dilution of the ferroelectric phase.