First-order phase transition and unexpected rigid rotation mode in hybrid improper ferroelectric (La, Al) co-substituted Ca3Ti2O7 ceramics
文献类型：期刊论文
| 作者 | Hu, ZZ; Lu, JJ; Chen, BH; Gao, TT; Liu, XQ; Wen, W; Chen, XM |
| 刊名 | JOURNAL OF MATERIOMICS
 |
| 出版日期 | 2019 |
| 卷号 | 5期号:4页码:618-625 |
| ISSN号 | 2352-8478 |
| DOI | 10.1016/j.jmat.2019.07.002 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Ca3Ti2O7 with Ruddlesden-Popper structure exhibits the largest polarization among the known hybrid improper ferroelectrics. However, the high Curie temperature impedes the thorough study of phase transition through dielectric characterization. According to the previous theoretical design rule, the Curie temperature can be suppressed by increasing the tolerance factor. So, in the present work, high-quality Ca3-xLaxTi2-xAlxO7 (x = 0.0, 0.1, 0.2, 0.3) ceramics with increased tolerance factors were successfully prepared. The amplitude of oxygen octahedral tilt mode indeed decreases with increasing tolerance factors, leading to a degeneration of ferroelectric polarization. However, the unexpected rigid rotation mode causes the composition-invariable coercive fields. The Curie temperatures decrease linearly with increasing x and tolerance factors. The variable-temperature dielectric constant confirms first-order improper ferroelectric transitions in Ca3Ti2O7-based ceramics. The results of variable temperature X-ray diffraction reveal the coexistence of two-phases below Curie temperature. The present work confidently confirms the first-order improper ferroelectric transition in Ca3Ti2O7-based ceramics by combining results of variable-temperature dielectric response and in-situ X-ray powder diffraction. (C) 2019 The Chinese Ceramic Society. Production and hosting by Elsevier B.V. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32063]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Zhejiang Univ, Sch Mat Sci & Engn, Lab Dielect Mat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China; 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Pudong New Area, Shanghai 201204, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, ZZ,Lu, JJ,Chen, BH,et al. First-order phase transition and unexpected rigid rotation mode in hybrid improper ferroelectric (La, Al) co-substituted Ca3Ti2O7 ceramics[J]. JOURNAL OF MATERIOMICS,2019,5(4):618-625. |
| APA | Hu, ZZ.,Lu, JJ.,Chen, BH.,Gao, TT.,Liu, XQ.,...&Chen, XM.(2019).First-order phase transition and unexpected rigid rotation mode in hybrid improper ferroelectric (La, Al) co-substituted Ca3Ti2O7 ceramics.JOURNAL OF MATERIOMICS,5(4),618-625. |
| MLA | Hu, ZZ,et al."First-order phase transition and unexpected rigid rotation mode in hybrid improper ferroelectric (La, Al) co-substituted Ca3Ti2O7 ceramics".JOURNAL OF MATERIOMICS 5.4(2019):618-625. |
入库方式： OAI收割
来源：上海应用物理研究所
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