1994 Volume 43 Issue 492 Pages 1047-1052
Dense manganese zinc ferrites (MnZn ferrites) and lead lanthanum zirconate titanate (PLZT) with fine grains were fabricated by post-hot isostatic pressing (HIP) technique using finely ground starting powders prepared by a media agitation milling method.
The average particle size of MnZn ferrites milled by media agitation milling was 0.03μm, and the average grain size of the HIP'ed body was 1.2μm. The ferrites showed low power-loss at high frequencies and initial permeability of 500 at 10MHz.
HIPing treatment of PLZT ceramics improved the transmittance without significant increase in grain size. The optical transmittance and grain size of HIP'ed PLZT were 69% at the wavelength of 750nm and 2μm, respectively. PLZT with fine grains showed microscopically uniform birefringence. At the wavelength below 500nm, the transmittance of Ar-HIP'ed PLZT was higher than that of O2-HIP'ed PLZT. The highly transparent PLZT is feasible for the fabrication of optical shutter arrays having high dimensional accuracy and optical uniformity for electrophotography.
