Hydrothermal synthesis and dielectric properties of lead nickel niobate ceramics
Journal
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Journal Volume
38
Journal Issue
9 B
Pages
5478-5482
Date Issued
1999
Author(s)
Hwang W.-J.
Abstract
Lead nickel niobatc (Pb(Ni1/3Nb2/3)O3) has been prepared by a newly developed hydrothermal process. During the hydrothermal reaction at 250¢XC, a pyrochlore phase is formed. After calcining the 250¢XC-hydrothermally derived precursors at 750¢XC, a monophasic Pb(Ni1/3Nb2/3)O3 compound is successfully produced. Increasing the hydrothermal temperature significantly facilitates the formation of the perovskite phase. In comparison with the solid-state reaction, the hydrothermal process not only reduces the temperature for synthesizing Pb(Ni1/3Nb2/3)O3, but also decreases its particle size to the submicron range. The dielectric properties of Pb(Ni1/3Nb2/3)O3 strongly depend on the electric field frequency. Increasing the field frequency results in an increase in the apparent Curie temperature, which is associated with a decrease in the maximum dielectric permittivity. The critical exponent and diffuseness calculated by a modified permittivity-temperature equation verify the relaxor characteristics of Pb(Ni1/3Nb2/3)O3. ? 1999 Publication Board, Japanese Journal of Applied Physics.
Subjects
Ceramics
Ferroelectric
Hydrothermal
Lead nickel niobate
Synthesis
Ceramics; Ferroelectric; Hydrothermal; Lead nickel niobate; Synthesis
Other Subjects
Calcination; Ceramic materials; Computational methods; Electric field effects; Ferroelectric materials; Mathematical models; Permittivity; Perovskite; Synthesis (chemical); Curie temperature; Hydrothermal synthesis; Lead nickel niobate; Lead compounds
Type
journal article