材料科学
稀土
灵敏度(控制系统)
金属
Crystal(编程语言)
配位复合体
晶体结构
结晶学
纳米技术
化学物理
无机化学
冶金
计算机科学
物理
工程类
化学
电子工程
程序设计语言
作者
Yutian Lei,Guoqiang Peng,Zhen Guan,Youkui Xu,Haoxu Wang,Hang Xie,Zhenhua Li,Zhiwen Jin
标识
DOI:10.1002/adfm.202515738
摘要
Abstract Metal halides demonstrate superior defect tolerance and carrier transport stemming from their inherent lattice softness, positioning them as promising candidates for X‐ray detection. However, this structural flexibility induces weak interatomic bonding, triggering detrimental issues like ion migration and lattice distortion that ultimately create an inherent trade‐off between detection efficiency and stability. Here, we present a pioneering strategy employing rare‐earth heterobimetallic compounds with pseudohalide‐bridged coordination crystals ((HMT) 2 CsEu(NO 3 ) 6 , HMT = Hexamethylenetetramine) to establish structurally robust lattice, thereby enabling simultaneous achievement of operational stability and detection efficiency. Systematic experiments reveal three synergistic lattice‐stabilizing mechanisms: i) a robust structural framework constructed by strong rare earth‐pseudohalide‐bridged coordination networks, ii) localized 4f‐orbital electron confinement, and iii) Cs‐O bonding interactions. Concurrently, the unique electronic structure characterized by indirect band transitions and low orbital symmetry facilitates the generation of long‐lifetime and low‐concentration carriers. The optimized crystal demonstrates weak electron‐phonon coupling ( S = 0.0159) and exceptional ambient stability. The implemented X‐ray detector achieves a record sensitivity of 3949 µC Gy air −1 cm −2 among hybrid bimetallic halides, a detection limit of 41.2 nGy air s −1 , and a high‐resolution imaging capability at low doses (361 nGy air s −1 ). This work establishes a paradigm for designing stable, high‐performance radiation detection materials through synergistic coordination engineering.
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