Wlodarczyk Damian, Amilusik Mikolaj, Kosyl Katarzyna M, Chrunik Maciej, Lawniczak-Jablonska Krystyna, Przybylinska Hanka, Kosmela Paulina, Strankowski Michal, Bulyk Lev-Ivan, Tsiumra Volodymyr, Islam Rajibul, Autieri Carmine, Xue Fei, Zajac Marcin, Lysak Anastasiia, Minikayev Roman, Bockowski Michal, Suchocki Andrzej
Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland.
Institute of High Pressure, Polish Academy of Sciences, Sokołowska 29/37, PL-01142 Warsaw, Poland.
Inorg Chem. 2024 Jun 3;63(22):10194-10206. doi: 10.1021/acs.inorgchem.4c00567. Epub 2024 May 20.
We report details on the synthesis and properties of barium praseodymium tungstate, BaPrWO, a double perovskite that has not been synthesized before. Room-temperature (RT) powder X-ray diffraction identified the most probable space group (SG) as monoclinic 2/, but it was only slightly distorted from the cubic structure. X-ray photoelectron spectroscopy confirmed that the initial (postsynthesis) material contained praseodymium in both 3+ and 4+ charge states. The former (Pr) disappeared after exposure to UV light at RT. Photoluminescence studies of Pr revealed that BaPrWO is an insulator with a band gap exceeding 4.93 eV. Pressure-dependent Raman spectroscopy excluded the possibility of a phase transition up to 20 GPa; however, measurements between 8 and 873 K signified that there might be a change toward the lower symmetry SG below 200 K. Electron paramagnetic resonance spectra revealed the presence of interstitial oxygen which acts as a deep electron trap.
我们报告了钨酸钡镨（BaPrWO）的合成细节及性质，它是一种此前未被合成过的双钙钛矿。室温（RT）粉末X射线衍射确定最可能的空间群（SG）为单斜2/，但它仅略微偏离立方结构。X射线光电子能谱证实初始（合成后）材料中镨存在3+和4+两种电荷态。前者（Pr³⁺）在室温下暴露于紫外光后消失。对Pr的光致发光研究表明BaPrWO是一种带隙超过4.93 eV的绝缘体。压力依赖拉曼光谱排除了高达20 GPa时发生相变的可能性；然而，8至873 K之间的测量表明在低于200 K时可能会向较低对称性的空间群转变。电子顺磁共振光谱揭示了间隙氧的存在，其作为一个深电子陷阱。
