PHASE EVOLUTION DURING SINTERING OF BI-TI-DOPED ZINC-OXIDE

Phase evolution and localization during sintering of spherical Bi-Ti-d oped zinc oxide powders were studied by X-ray diffraction and transmis sion electron microscopy. Several minor phases were identified on quen ched ceramics; a phase, either amorphous or crystalline, stable at a w ide range of compositions, originating from solidification of the melt phase during quenching, was detected. Sintering processes were discus sed: depending on the Ti content, densification, liquid-phase occurren ce and grain growth are quite different.