Crystal and electronic structures, and photoluminescence and photocatalytic properties of α-EuZrS₃

Abstract

Novel crystalline α-EuZrS3 shows Eu2+ photoluminescence and is photocatalytically active towards the decomposition of methylene blue under visible light or simulated sunlight irradiation.

Chalcogenide Perovskites: Tantalizing Prospects, Challenging Materials

“…[ 92 ] Most studies report the GdFeO 3 ‐type modification for SrZrS 3 , due to using synthesis temperatures above the transition. [ 23,24,32,70,92 ] EuZrS 3 seems to have similar behavior considering that the low‐temperature NH 4 CdCl 3 ‐type [ 93 ] and the higher‐temperature GdFeO 3 ‐type [ 23 ] phases were reported in different works. The related compounds, SrHfS 3 [ 23–25 ] and EuHfS 3 , [ 23 ] have only been grown in the GdFeO 3 ‐type structure (owing to higher temperature synthesis), but considering the chemical similarity of Zr and Hf, they may have low‐temperature NH 4 CdCl 3 ‐type modifications as well.…”

“…A good deal of the literature of chalcogenide perovskites concerns materials prepared by bulk solid‐state synthesis. [ 23–25,42,68,70,72,74,92,93,127,137,141,142,152,178,180–184 ] The typical growth conditions, including temperatures in excess of 1000 °C and reaction periods of many hours to days, are designed to facilitate complete interdiffusion of reactant materials over large length scales (µm to mm), to yield homogeneous and crystalline bulk material. These conditions are totally different to those that will be used for PV devices, and this can lead to some potentially misleading conclusions.…”

“…One such example is the observation of perovskite structures for SrZrS 3 [ 24,92 ] and EuZrS 3 . [ 93 ] In fact, while these materials do happen to crystallize in this structure at the temperature of solid‐state synthesis, at the temperatures commonly used for thin film synthesis (<700 °C), they would preferably adopt the NH 4 CdCl 3 ‐type structure (see Section 2), unless stabilized by some external factors. In the same vein, some materials may change their physicochemical properties and exhibit incipient structural degradation, due to, e.g., anion deficiency, when grown at high temperatures.…”

The size effect to O2−–Ce4+ charge transfer emission and band gap structure of Sr2CeO4

“…The band structure together with density of states (DOS) computations based on density functional theory (DFT) theory were performed using Materials Studio software . The DOS and band structure diagrams for Sr 2 CeO 4 were calculated using the CASTEP code within the plane‐wave pseudopotential approach.…”

Syntheses, crystal structures and applications of novel crystalline metal chalcogenides

“…[104][105][106][107][108][109][110] Additionally, the photocatalytic activities of tellurides as catalysts were also explored under UV light irradiation. [118][119][120] 127 in which R is the reflectance, α represents the absorption coefficient, and S means the scattering coefficient that is independent of wavelength when the particle size of samples is bigger than 5 µm. The studies of thermal stability were conducted on TGA TA Instruments Q500 under flowing pure N2 with the temperature rate of 10 °C/min up to 900 °C.…”