Journal Article

PUBDB-2025-04343

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structural transition and emission enhancement in vacancy-ordered halide double perovskite Cs$_2$TeCl$_6$ under pressure

Mukherjee, S.Extern* ; Samanta, D.Extern* ; Mukherjee, B.Extern* ; Glazyrin, K.XFEL.EU*DESY* ; Mukherjee, G. D. (Corresponding author)Extern*

2025
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: doi:10.1063/5.0258183  doi:10.3204/PUBDB-2025-04343

Abstract: The effect of pressure on the structural evolution, the enhancement of the photoluminescence intensity, and the optical bandgap of a vacancy-ordered double halide perovskite, Cs2TeCl6, is investigated systematically. We use synchrotron x-ray diffraction, Raman spectroscopy, optical bandgap, and photoluminescence measurements to explore the structural and optical properties of Cs2TeCl6 under pressure up to 30.0 GPa. We find that Cs2TeCl6 undergoes a structural transition from cubic Fm m to monoclinic P21/n at very low pressure below 1.0 GPa. A significant increase in photoluminescence intensity and a rapid decrease in optical bandgap are observed, which are related to the octahedral distortion and structural transition. Interestingly, with increasing pressure, the sample regains its ambient Fm m structure at around 3.4 GPa, maintaining the cubic phase up to 30.0 GPa. The sample undergoes an iso-structural transition at around 14.1 GPa pressure with a slight decrease in compressibility.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. INDIA-DESY - INDIA-DESY Collaboration (2020_Join2-INDIA-DESY) (2020_Join2-INDIA-DESY)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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