离子半径失配作为调控相变和发光测温的结构杠杆
Ionic-Radius Mismatch as a Structural Lever for Tuning Phase Transitions and Luminescent Thermometry
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences（波兰科学院低温结构研究所）
- Wrocław University of Technology（弗罗茨瓦夫理工大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究通过离子半径失配策略调控K3Lu(PO4)2:Eu3+的相变温度和热工作范围，建立了失配参数与热力学量的线性关系，为设计定制相变材料提供了通用框架。
AI中文摘要：
发光温度计的广泛应用需要全面理解控制其测温性能的结构因素。建立这种结构-性能关系对于合理设计具有应用定制特性的传感材料至关重要。这对于基于相变的发光温度计尤其重要，因为它们具有极高的相对灵敏度。对K3Lu(PO4)2:Eu3+的系统分析表明，引入具有受控离子半径失配的共掺杂离子为调控相变特性提供了一种有效策略。该方法能够同时控制相变温度和热工作范围。具体而言，相变温度从K3Lu(PO4)2:Eu3+的210 K移至K3Lu(PO4)2:Eu3+,10%La3+的310 K，而工作范围从30 K拓宽至60 K。重要的是，离子半径失配参数Ω与相变温度、焓和熵之间的线性相关性为通过成分工程控制相变热力学提供了定量框架。除了发光测温之外，这些关系建立了一种通用策略，用于设计具有定制热力学特性的一级相变材料，为其在广泛功能应用中的优化开辟了机会。
英文摘要：
The widespread implementation of luminescence thermometers requires a comprehensive understanding of the structural factors governing their thermometric performance. Establishing such structure-property relationships is essential for the rational design of sensing materials with application-tailored characteristics. This is particularly relevant for phase-transition-based luminescence thermometers, which offer exceptionally high relative sensitivities. The systematic analysis of K3Lu(PO4)2:Eu3+ demonstrates that introducing co-dopant ions with a controlled ionic-radius mismatch provides an effective strategy for tailoring phase-transition characteristics. This approach enables both the phase-transition temperature and thermal operating range to be controlled. Specifically, the transition temperature shifts from 210 K for K3Lu(PO4)2:Eu3+ to 310 K for K3Lu(PO4)2:Eu3+,10%La3+, while the operating range broadens from 30 to 60 K. Importantly, linear correlations between the ionic-radius mismatch parameter, Ω, and the phase-transition temperature, enthalpy, and entropy provide a quantitative framework for controlling the thermodynamics of the transition through compositional engineering. Beyond luminescence thermometry, these relationships establish a general strategy for designing materials exhibiting first-order phase transitions with tailored thermodynamic characteristics, opening opportunities for their optimization across a broad range of functional applications.
