Synthesis and Properties of the BaPrWO Double Perovskite.

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.

Correction to "Synthesis Attempt and Structural Studies of Novel ACeWO Double Perovskites (A = Ba, Ca) in and outside of Ambient Conditions".

[This corrects the article DOI: 10.1021/acsomega.2c00669.

Synthesis Attempt and Structural Studies of Novel ACeWO Double Perovskites (A = Ba, Ca) in and outside of Ambient Conditions.

This comprehensive work showcases two novel, rock-salt-type minerals in the form of amphoteric cerium-tungstate double perovskite and ilmenite powders created via a high-temperature solid-state reaction in inert gases. The presented studies have fundamental meaning and will mainly focus on a detailed synthesis description of undoped structures, researching their possible polymorphism in various conditions and hinting at some nontrivial physicochemical properties like charge transfer for upcoming optical studies after eventual doping with selectively chosen rare-earth ions. The formerly mentioned, targeted ABB'X group of compounds contains mainly divalent alkali cations in the form of A = Ba, Ca sharing, here, oxygen-arranged clusters (X = O) with purposely selected central ions from f-block B = Ce and d-block B' = W since together they often possess some exotic properties that could be tuned and implemented into futuristic equipment like sensors or energy converters.

Hole Trapping Process and Highly Sensitive Ratiometric Thermometry over a Wide Temperature Range in Pr-Doped NaLaTiO Layered Perovskite Microcrystals.

We demonstrate a potential optical thermometric material, Pr-doped triple-layered perovskite NaLaTiO microcrystals, which promises a remarkable performance in temperature sensing over a wide temperature range (125-533 K), with a maximum relative sensitivity of 2.43% K at 423 K. Both temperature and high-pressure dependent photoluminescence measurements were performed for this compound.

High-Pressure Low-Temperature Optical Studies of BaWO:Ce,Na Crystals.

We report detailed optical studies of BaWO:Ce and BaWO:Ce,Na single crystals. The material does not emit any luminescence at ambient pressure under near-UV (325 nm) excitation. Efficient green light is emitted only at high pressure (HP) and low temperature (LT).