Synchrotron-radiation-based (SR-based) Mössbauer spectroscopy for the 73 keV transition in ¹⁹³Ir nuclei was successful. ¹⁹³Ir SR-based Mössbauer spectra of Ca₅Ir₃O₁₂, as well as those of Ir metal and IrO₂ were measured. The results for Ir metal and IrO₂ agree with those reported previously. On the other hand, the spectra of Ca₅Ir₃O₁₂ exhibit temperature dependence. Differences in the observed spectra between 90 and 110 K reflect a change in electronic state at the Ir sites, which correlates with the phase transition reported at 105 K. The results reported in the present work also demonstrate that ¹⁹³Ir SR-based Mössbauer spectroscopy is a powerful tool for investigating microscopic electronic states in Ir-containing compounds.

中文翻译：

---

用于 Ca5Ir3O12 中 Ir 价歧化的 193Ir 基于同步辐射的穆斯堡尔光谱

用于¹⁹³ Ir 核中73 keV 跃迁的基于同步加速器辐射（基于 SR）的穆斯堡尔光谱是成功的。测量了 Ca ₅ Ir ₃ O ₁₂以及 Ir 金属和 IrO _{2 的}¹⁹³基于 Ir SR 的穆斯堡尔谱。Ir 金属和 IrO ₂的结果与之前报道的结果一致。另一方面，Ca ₅ Ir ₃ O ₁₂的光谱表现出温度依赖性。90 和 110 K 之间观察到的光谱的差异反映了 Ir 位点电子状态的变化，这与 105 K 报告的相变相关。本工作报告的结果还表明，基于¹⁹³ Ir SR 的穆斯堡尔光谱是一种用于研究含 Ir 化合物的微观电子态的强大工具。