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Farbication of Optically Transparent Lead Magnesium Niobate Polycrystalline Ceramics Using Hot Isostatic Pressing
Author(s) -
Kim Namchu,
McHenry Dean A.,
Jang SeiJoo,
Shrout Thomas R.
Publication year - 1990
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.1151-2916.1990.tb05137.x
Subject(s) - hot isostatic pressing , materials science , ceramic , crystallite , dielectric , transparent ceramics , lead oxide , permittivity , annealing (glass) , hot pressing , transmittance , composite material , mineralogy , sintering , metallurgy , optoelectronics , chemistry
The physical, dielectric, and optical properties of hot isostatically pressed lead magnesium niobate polycrystalline ceramics modified with 1/2 mol% La 2 O 3 , Pb 1–3/2 x La x □ x /2 ‐(Mg 1/3 Nb 2/3 )O 3 , have been investigated. Methods used to characterize the ceramics included determination of the dielectric permittivity, optical transmittance, and refractive index dispersion. The materials exhibited relaxor ferroelectric type behavior with a peak dielectric constant K > 14000 and average T c ∼−35°C. Various sintering, hot isostatic pressing, and annealing conditions were examined to produce highly dense and optically transparent materials. Through the use of hot isostatic pressing, densities more than 99.5% theoretical and transmittance greater than 50% at 633‐nm wavelength were obtained. Hot isostatic pressing technique appears to be a good alternative to hot uniaxial pressing without the associated problem of PbO volatility, reactivity with the pressure vessel, and geometrical constraints.