Abstract
Non-stoichiometric ceramics with the series oxygen-deficient pyrochlore in Bi 2O 3–ZnO–Nb 2O 5 ternary system was investigated to obtain structural information. Crystal structure and dielectric properties of the group of Bi 1.5−2 x Zn 1+2 x Nb 1.5O 7− x (with x=0–0.3) compositions have been studied. The compounds departured badly from stoichiomeric compositions lead to structural distortion and unbalance of pyrochlore phase, till secondary phase occurs for x=0.3. It can be inferred from Raman spectra that the concentration and ratio of species occupied B site is stable, while those of species occupied A site vary between the series compositions. It is reasonable to reckon that zinc dominantly occupies B site in pyrochlore structure with compositions varying. The experimental results show that dielectric constant ( ε) decrease linearly while the temperature coefficient of dielectric constant ( α ε ) effectively increases with increasing of the x-value. Crystal distortion and structural defect resulting from chemical composition unbalance bring on the change of dielectric properties for the small x-value.
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