Because of the possible crossover of Pb and 3d transition-metal (T_M) redox levels, a charge transfer between Pb and T_M leads to a continuous evolution from Pb²⁺Ti⁴⁺O₃ to Pb⁴⁺Ni²⁺O₃ in the perovskite family of PbT_MO₃ as verified by several reports. However, very little information is known about PbMnO₃ in the PbT_MO₃ series. The perovskite PbMnO₃ is the most difficult one to synthesize, although its geometric tolerance factor is close to 1. Here, we report a careful study of PbMnO₃ synthesized under 15 GPa by a structural refinement and high-precision X-ray absorption spectroscopy (XAS) as well as a variety of measurements of physical properties. We can rationalize the physical properties of PbMnO₃ based on a local bonding model and the valence states of Pb and Mn from XAS. Moreover, the complete study of PbMnO₃ allows us to construct a more consistent picture of the valence evolution and the charge disproportionation for the entire family of PbT_MO₃ perovskites.

中文翻译：

---

高压合成的PbMnO ₃钙钛矿中的电荷歧化和复磁性

因为Pb和3d过渡金属（T的可能的交叉的_中号）的氧化还原水平，铅和T之间的电荷转移_中号导致一个连续的演化选自Pb ²⁺的Ti ⁴⁺ ø ₃对Pb ⁴⁺的Ni ²⁺ ö ₃ PbT _M O ₃的钙钛矿家族中的一些元素，已得到一些报道的证实。然而，关于PbT _M O ₃系列的PbMnO ₃的信息知之甚少。钙钛矿型PbMnO ₃是最难合成的，尽管其几何公差系数接近1。在这里，我们报道了对PbMnO的仔细研究。在15 GPa下通过结构改进和高精度X射线吸收光谱（XAS）以及各种物理性能测量合成了₃种。我们可以基于局部键合模型以及XAS中Pb和Mn的价态来合理化PbMnO ₃的物理性质。此外，对PbMnO ₃的完整研究使我们能够为整个PbT _M O ₃钙钛矿家族的化合价演化和电荷歧化建立更一致的图景。