采用传统氧化物反应法(一步法)和前驱体法(两步法)合成铁掺杂改性的0．075Pb(Zn1/3 Nb2/3)O3-0．925Pb(Zr0．95 Ti0．05)O3(PZN-PZT)热释电陶瓷，研究制备方法对PZN-PZT热释电陶瓷的微观形貌、相结构及电学性能的影响。XRD结果表明，采用一步法制备的陶瓷不如两步法，前者存在钙钛矿相和少量焦绿石相，后者能有效抑制焦绿石相的生成，陶瓷为纯菱方钙钛矿相。SEM分析进一步证实了两步法能够制备出晶粒分布均匀、晶型饱满的致密陶瓷。结合介电、铁电及热释电性能分析可知，单一钙钛矿结构和均匀紧凑的晶粒结构对陶瓷材料电学性能的增强起着重要的作用。
Fe-doped 0.075 Pb(Zn1/3 Nb2/3 )O3-0.925Pb(Zr0.95 Ti0.05 )O3 (PZN-PZT)pyroelectric ceramics were pre-pared by a conventional oxide-mixed one-step method and precursor two-step method,respectively.The phase structure and electrical properties of the prepared ceramics were systematically investigated.X-ray diffraction results indicated that the ceramics fabricated by the one-step method possess a mixture of perovskite phase and pyrochlore phase,while the ceramics prepared from the two-step method have a single perovskite phase struc-ture.Scanning electron microscopy observation suggests that the ceramics prepared by the two-step method have a dense microstructure with uniform grains.The dielectric,ferroelectric and pyroelectric properties were measured,which revealed that the ceramics with single phase and dense microstructure have enhanced ferroelec-tric and pyroelectric properties.
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