谷吉海,曹文萍,王剑菲,巩雪.Na0.5Bi0.5TiO3−BaTiO3−SrTiO3陶瓷的相图及电致伸缩性能[J].包装工程,2022,43(21):32-39.
GU Ji-hai,CAO Wen-ping,WANG Jian-fei,GONG Xue.Phase Diagram and Electrostrictive Effect of Na0.5Bi0.5TiO3-BaTiO3-SrTiO3 Ceramics[J].Packaging Engineering,2022,43(21):32-39. |
| Na0.5Bi0.5TiO3−BaTiO3−SrTiO3陶瓷的相图及电致伸缩性能 |
| Phase Diagram and Electrostrictive Effect of Na0.5Bi0.5TiO3-BaTiO3-SrTiO3 Ceramics |
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| DOI：10.19554/j.cnki.1001-3563.2022.21.005 |
| 中文关键词: 酸铋钠基陶瓷 相结构 电致应变 电致伸缩效应 |
| 英文关键词: Na0.5Bi0.5TiO3-based ceramics phase structure electric-field-induced strain electrostrictive effect |
| 基金项目:哈尔滨商业大学科研项目(18XN070);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT?2020215);国家自然科学基金(41772387) |
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| 中文摘要: |
| 目的 利用SrTiO3调控Na0.5Bi0.5TiO3−BaTiO3−SrTiO3(NBT−BT−ST)三元系陶瓷的相结构，在室温下获得性能优异的电致伸缩材料，该材料可用于包装机械物料供给微振动器的研发。方法 采用传统固相合成法制备(1−x)[0.94NBT−0.06BT]−xST陶瓷。在分析(1−x)[0.94NBT−0.06BT]−xST陶瓷相图的基础上，阐述不同相区应变的来源，并系统研究弛豫相区陶瓷铁电、应变和电致伸缩性能等。结果 随着ST含量的增加，(1−x)[0.94NBT−0.06BT]−xST陶瓷的相结构由三方相、四方相两相共存→四方铁电相→铁电相、弛豫相共存→弛豫相。三方、四方两相共存区陶瓷的应变主要来源于晶格变形和非180o畴转向。铁电、弛豫两相共存区陶瓷的应变主要来源于电场引发弛豫相和铁电相的相变。弛豫相区陶瓷的应变主要来源于样品晶格本征变形产生的电致伸缩效应。在弛豫相区，随着ST含量的增大，(1−x)[0.94NBT−0.06BT]−xST陶瓷的弛豫性增强，电滞回线逐渐变瘦，应变和滞后性均出现不同程度的降低，其中，x=0.40的样品在电场强度60 kV/cm下的应变滞后性降至7.8%，表现出典型的电致伸缩特征。在较强的弛豫性和形成纳米极性微区的作用下，在组分x=0.40时陶瓷在电场强度50 kV/cm下的电致伸缩系数高达0.021 3 m4/C2。结论 通过ST调控NBT基陶瓷的相结构，在弛豫相区能够有效地改善其电致伸缩性能。利用该技术制备的陶瓷电致伸缩材料可为包装机械物料供给微驱动器的研发和改进提供技术支持。 |
| 英文摘要: |
| The work aims to regulate the phase structure of Na0.5Bi0.5TiO3−BaTiO3−SrTiO3 (NBT−BT−ST) ternary ceramics with SrTiO3, to obtain electrostrictive materials of good performance at room temperature, so as to use it in research and development of micro feeding vibrator for packaging machinery. (1−x)[0.94NBT-0.06BT]-xST ceramics were prepared through conventional solid-state reaction method. Based on the analysis of the phase diagram of (1−x)[0.94-NBT-0.06BT]-xST ceramics, the origin of strain property in different phase regions was illustrated. The ferroelectric, strain and electrostrictive behavior of the ceramics with relaxor phase were investigated. With the increase of ST content, the phase structure of (1−x)[0.94-NBT-0.06BT]-xST ceramics underwent the following changes:coexistence of rhombohedral and tetragonal → tetragonal → coexistence of ferroelectric and relaxor → relaxor. The strain of the ceramics in the rhombohedral and tetragonal coexisting region, the ferroelectric and relaxor coexisting region and the relaxor phase region were mainly attributed to the lattice deformation and the non-180o domain switching, the electric-field-induced reversible relaxor to ferroelectric phase transformation and the electrostrictive effect, respectively. With the increase of ST content in the relaxor phase region, the relaxation of (1−x)[0.94-NBT-0.06BT]-xST ceramics enhanced, the ferroelectric hysteresis loop narrowed, while the strain values and hysteresis decreased in varying degrees. The strain hysteresis of the sample with x=0.40 decreased to 7.8% under 60 kV/cm, showing typical electrostrictive characteristics. A high electrostrictive coefficient of 0.021 3 m4/C2 was achieved for the composition with x=0.40 at 50 kV/cm due to the strong relaxation and the formation of polar-nano-regions. The phase structure of NBT based ceramics regulated by ST can effectively improve the electrostrictive property in the relaxor phase region. The electrostrictive materials of ceramics prepared with this technique can provide technical foundation for research, development and improvement of micro actuator for packaging materials. |
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