Synthesis and Properties of the Ba<sub>2</sub>PrWO<sub>6</sub> Double Perovskite
Damian Włodarczyk, Mikolaj Amilusik, K.M. Kosyl, M. Chrunik, Krystyna Lawniczak-Jablonska, H. Przybylińska, Paulina Kosmela, Michał Strankowski, Lev-Ivan Bulyk, Volodymyr Tsiumra, Rajibul Islam, Carmine Autieri, Fei Xue, Marcin Zając, Anastasiia Lysak, R. Minikayev, Michał Boćkowski, A. Suchocki
Abstract
High Resolution Image Download MS PowerPoint Slide We report details on the synthesis and properties of barium praseodymium tungstate, Ba 2 PrWO 6, 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 I 2/ m, 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 3+ ) disappeared after exposure to UV light at RT. Photoluminescence studies of Pr 3+ revealed that Ba 2 PrWO 6 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.