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Mixed oxides containing La, Mg and Ta were prepared by the sol-gel method. A pure phase, La(Mg 2/3 Ta 1/3 )O 3 was formed by calcining the gel at a low temperature (<1100 o C). The gel powders calcined at 1100 o C were made into pellets and sintered at 1500 o C for 6 h. The room temperature dielectric constant and tangent loss...
Lanthanum-modified PZT ceramics are successfully fabricated using coprecipitation powder coating. The diffusion of lanthanum from the coating layer into the PZT lattice results in the reduction of the tetragonality of lanthanum-modified PZT ceramics. Lanthanum substitution has a strong effect on the level of diffuseness of the phase transition. The dielectric peak temperatures obviously shift to lower...
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