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南昌大学廖伟强、熊仁根:MOF 基中性 X 位钙钛矿铁弹性晶体 —— 配位 -π 作用可逆重构实现自修复

  • 2026-06-16 15:13:45
南昌大学廖伟强、熊仁根:MOF 基中性 X 位钙钛矿铁弹性晶体 —— 配位 -π 作用可逆重构实现自修复

第一作者:Xiaogang ChenYan Qin(共同一作)

通讯作者:廖伟强、熊仁根

单位:南昌大学国际有序物质科学研究院

摘要

传统 ABX钙钛矿 X 位均为阴离子,且分子晶体自修复机制稀缺。本研究首次构建中性 X 位钙钛矿 (NXP) 晶体(SbF) Ag (pyrazine),以中性吡嗪为 X 位、Ag B 位、SbF₆⁻ A 位,形成类 MOF 三维钙钛矿拓扑。该晶体发生两步可逆铁弹性相变:163 K 时为重构型 mm2Fm 相变,伴随Ag配位键断裂与 Ag∙∙∙π 作用可逆生成;322 K 为有序 - 无序型 4̅ 3mFmm2 相变。低温重构相变产生约 10 倍于高温相变的自发应变,引发晶体微裂纹;升温相变回复时,裂纹完全自修复,力学性能保留率 >91%。该工作开创配位键 -π 作用可逆重构的晶体自修复新机制,为多功能分子钙钛矿设计提供全新范式。

文章亮点:

1.国际首创:中性 X  ABX钙钛矿新体系,融合 MOF 与钙钛矿优势

突破传统钙钛矿全离子组成限制,以中性吡嗪作 X 位构筑三维角共享八面体框架,兼具钙钛矿结构规整性与 MOF 配体可调性,容忍因子~0.87,结构稳定、可溶液生长大尺寸单晶。

2.全新自修复机制:配位键与 Ag∙∙∙π 作用可逆切换,无需离子扩散

低温相变中 1/6 Ag−N 键断裂、吡嗪翻转,形成Ag∙∙∙π 作用;升温回复为配位键,实现晶格重构式自修复,区别于传统动态共价、静电、离子扩散机制,为分子晶体自修复提供新策略。

3.两步铁弹性相变,对称性破缺清晰,兼具非线性光学活性

·高温相(373 K):立方 4̅3m,光学各向同性;

·中温相(300 K):正交 mm2SHG 响应显著;

·低温相(83 K):单斜 m,双折射可达~0.012

相变完全可逆,DSC 循环无衰减,热分解温度 428 K,稳定性优异。

4.大自发应变诱导裂纹,原位自修复,力学性能近乎完全恢复

低温相变自发应变~0.0549,为高温相变10 倍,引发晶体微裂纹;

升温回复后裂纹完全消失,杨氏模量保留91.7%、硬度保留97.2%,自修复后晶体恢复单结晶性。

5.低温压电响应增强,适用于极低温机电耦合器件

PFM测试显示,2 K 极低温压电响应远强于室温,与常规铁电材料低温响应衰减相反,为低温压电、传感提供新型材料平台。

6.结构 -性能闭环验证,普适性与可设计性强

对比氟 / 甲基取代吡嗪衍生物,证实相变是自修复的必要条件;

单晶 XRDRamanPXRDSHG、介电、双折射多手段表征一致,理论与实验完美契合,可通过配体修饰拓展家族与功能。

X.-G. Chen, Y. Qin, H.-P. Lv, X.-J. Song, W.-Q. Liao, R.-G. Xiong, Metal−Organic Framework Goes Perovskite: A Self-Healing Neutral X‑Site Perovskite Ferroelastic Crystal, J. Am. Chem. Soc., 2026,https://doi.org/10.1021/jacs.6c08330

原文链接https://doi.org/10.1021/jacs.6c08330

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  1. CONNECT:[ UseTime:0.000980s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001019s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008510s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001540s ]
  6. SELECT * FROM `set` [ RunTime:0.003194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001599s ]
  8. SELECT * FROM `article` WHERE `id` = 523136 LIMIT 1 [ RunTime:0.038142s ]
  9. UPDATE `article` SET `lasttime` = 1781881091 WHERE `id` = 523136 [ RunTime:0.001639s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000704s ]
  11. SELECT * FROM `article` WHERE `id` < 523136 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001204s ]
  12. SELECT * FROM `article` WHERE `id` > 523136 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000957s ]
  13. SELECT * FROM `article` WHERE `id` < 523136 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001704s ]
  14. SELECT * FROM `article` WHERE `id` < 523136 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003767s ]
  15. SELECT * FROM `article` WHERE `id` < 523136 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.076769s ]
0.308092s