Structure and piezoelectric properties of lead-free bismuth-based perovskite solid solutions Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3j3335153

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  • A new group of lead free piezoelectric perovskite solid solutions, (1-x)Bi(B'B")O₃-xABO₃, were obtained via solid-state processing techniques. The solubility of unstable perovskite Bi(B'B")O₃ compounds into stable perovskite compounds was found to be related to the tolerance factor of the ABO₃ perovskite endmembers. The morphotropic phase boundary (MBP) in perovskite solid solutions based on (1-x)Bi(Zn₁/₂Ti₁/₂)O₃-xBaTiO₃ has been measured at x≈0.9 by x-ray diffraction (XRD). Most of the work in this thesis was focused on the structure and electrical behavior of Bi(Zn₁/₂Ti₁/₂)O₃ (BZT) solid solutions with different ABO₃ end members. Dielectric characterization revealed that the trend of transition temperature Tm as a function of composition for BZT-ABO₃ solid solutions can be described by two types. In the first type, Tm decreased linearly or non-linearly until a second phase appeared, e.g. BZT-(Bi₁/₂K₁/₂)TiO₃. In the second type, Tm decreased to a minimum (usually below room temperature) and then increased as BZT content increased, e.g. BZT-BaTiO₃. In addition, with substitution of Li for Na in Bi(Zn₁/₂Ti₁/₂)O₃-NaNbO₃ the diffuseness of the transition peak decreased and transition temperature increased. Hysteresis measurements indicated that the ferroelectric state of NaNbO₃, (Bi₁/₂K₁/₂)TiO₃ and BaTiO₃ can be induced or enhanced with small amounts of BZT. However, added BZT content resulted in the transition from a normal ferroelectric state to quasi-relaxor state. The ternary system BiScO₃-Bi(Zn₁/₂Ti₁/₂)O₃-BaTiO₃ was also studied in terms of structure and dielectric behavior.
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