| 唐志兰,周弘毅,王世超,龚跃球.化学通报,2024,87(3):344-348,354. |
| 铪掺杂对锆钛酸钡钙陶瓷电学性能的调控 |
| The Effects of the Hafnium Doping on the Electric Properties of the Ba0.95Ca0.05 Zr0.05Ti0.95-xHfx Ceramics |
| 投稿时间：2023-07-26 修订日期：2023-08-16 |
| DOI： |
| 中文关键词: BaTiO3 多晶型相转变 Hf掺杂 无铅压电陶瓷 |
| 英文关键词:BaTiO3 Polymorphic phase transitions Hf doped Lead free piezoelectric ceramics |
| 基金项目:国家自然科学基金项目(12172318)资助 |
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| 中文摘要: |
| 用固相反应法制备了B位Hf掺杂的Ba0.95Ca0.05 Zr0.05Ti0.95-xHfx (BCZ0.05T(0.95-x)-xH) (x=0、0.02、0.04、0.06和0.08)陶瓷。研究B位同时含有Hf、Zr、Ti三种元素时,BCZ0.05T(0.95-x)-xH陶瓷的相结构变化与电学性能的差异。XRD测试结果表明：Hf4+融入晶格,造成晶格膨胀。BCZ0.05T(0.95-x)-xH(x=0、0.02)陶瓷的XRD测试结果表明,该体系中存在明显的四方相与正交相共存的多晶型相转变(PPT),但正交相逐渐转变为主晶相；BCZ0.05T(0.95-x)-xH (x=0.04、0.06)陶瓷的XRD结果表明,四方相进一步减少,三方相却逐渐增加；当x继续增大到0.08时,XRD测试发现该体系只存在正交相和三方相结构。SEM测试发现,随着Hf的掺杂量增加,晶粒尺寸逐渐减小。剩余极化随Hf掺杂量的增加先增大再减小,在x为0.02时取得最大值,Hf掺杂显著降低矫顽场(Ec)。压电测试结果表明BCZ0.05T0.96-0.04H陶瓷具有最大压电系数(d33=259 pC/N)。 |
| 英文摘要: |
| Hf-doped modified Ba0.95Ca0.05Zr0.05Ti0.95-xHfx (BCZ0.05T(0.95-x)-xH) (x=0、0.02、0.04、0.06和0.08) ceramics were prepared by solid state reaction. The effect of Hf doping amount on the phase structure and electric properties was studied. The XRD results show that when the Hf doping amount is 0.0% and 2% mole, the coexistence of tetragonal phase and orthogonal phase structure (polymorphic phase transitions, PPT) was found. When the Hf doping amount increases to 4% and 6%, their existed the orthogonal phases and rhombohedral phases PPT structure while the residual tetragonal phases could also be found. But when the doping amount of Hf increases to 8%, the results show that only the orthogonal phases and rhombohedral phases were existed in the XRD pattern. It can be seen from the SEM images that the doping of Hf leads to slow grain growth rate and reduced grain size. The remnant polarization (Pr) of the BCZ0.05T0.93-0.02H ceramics reaches the maximum (Pr=6.38 μC/cm2). The maximum piezoelectricity is existed in the composition of BCZ0.05T0.91-0.04H (d33=259 pC/N). |
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