ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The sintering of LiTaO3 and KTaO3 with the aid of manganese oxide was studied at 1080 to 1300° C by X-ray analysis, scanning electron microscopy (SEM) and X-ray microanalysis (XMA). The sintering of pure LiTaO3 and KTaO3 proceeds concurrently with grain growth, but only achieves a density of 83% at 1300° C and of 72% at 1280° C, respectively. The addition of 3 wt% of MnO2 or Mn3O4 results in rapid densification of LiTaO3 to 90 to 92% within 30 min at 1190° C. In the presence of manganese oxide, KTaO3 densifies to 95% at 1280° C. The action of manganese oxide is attributed to the substitution of Mn3+ for Ta5+ in the LiTaO3 or KTaO3 lattice which enhances the diffusion of the rate-determining species, oxygen, in the oxide. In addition, a liquid phase formed at 1250° C in KTaO3 may significantly contribute to the achievement of 95% densification.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01120051
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