High temperature and composition induced phase transitions in LiZnV<inf>1-x</inf>As<inf>x</inf>O<inf>4</inf> phenacites

Crystal structure and Raman spectroscopy studies

B. Manoun, M. Azrour, P. Lazor, M. Azdouz, L. Bih, S. Benmokhtar, Rachid Essehli, L. El Ammari

Research output: Contribution to journalArticle

Abstract

Abstract In this work, using techniques of X-ray diffraction and Raman spectroscopy, we report the composition and high-temperature induced phase transition in the system LiZnV<inf>1-</inf><inf>x</inf>As<inf>x</inf>O<inf>4</inf> (0 ≤ x ≤ 1). Both techniques showed that the increase of arsenic amount induced a structural transition from R-3 LiZnVO<inf>4</inf> type to LiZnAsO<inf>4</inf> type belonging to R3 space group, the transition occurring between x = 0.7 and x = 0.8. Furthermore, increasing temperature for the compositions (0.8 ≤ x ≤ 1) manifests a transition from the LiZnAsO<inf>4</inf> structural type with R3 space group to the R-3 LiZnVO<inf>4</inf> structural type. For this series, the transition from the space group R3 to the centro-symmetric space group R-3 shows considerable changes in the compositional and temperature dependencies of the bands: spectral positions of all the observed Raman bands exhibit shifts linearly proportional to the temperature increase, with points of shift-rate changes revealing a symmetry change. The Raman-spectra based temperature-composition phase diagram confirms the results obtained using the method of Rietveld refinements, thus showing the R-3 to R3 transition occurring between x = 0.7 and 0.8.

Original languageEnglish
Article number13919
Pages (from-to)956-964
Number of pages9
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume151
DOIs
Publication statusPublished - 16 Jul 2015

Fingerprint

Raman spectroscopy
Crystal structure
Phase transitions
crystal structure
Chemical analysis
spectroscopy
Temperature
Rietveld refinement
Arsenic
temperature
shift
Phase diagrams
spectral bands
Raman scattering
arsenic
X ray diffraction
phase diagrams
Raman spectra
symmetry
diffraction

Keywords

  • High temperature Raman spectroscopy
  • LiZnV<inf>1-</inf><inf>x</inf>As<inf>x</inf>O<inf>4</inf>
  • Phase transition
  • Phenacite structure
  • Rietveld refinements
  • X-ray diffraction

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Spectroscopy

Cite this

High temperature and composition induced phase transitions in LiZnV<inf>1-x</inf>As<inf>x</inf>O<inf>4</inf> phenacites : Crystal structure and Raman spectroscopy studies. / Manoun, B.; Azrour, M.; Lazor, P.; Azdouz, M.; Bih, L.; Benmokhtar, S.; Essehli, Rachid; El Ammari, L.

In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 151, 13919, 16.07.2015, p. 956-964.

Research output: Contribution to journalArticle

@article{ebb04ec4405848efaf3f63d6ae92175c,
title = "High temperature and composition induced phase transitions in LiZnV1-xAsxO4 phenacites: Crystal structure and Raman spectroscopy studies",
abstract = "Abstract In this work, using techniques of X-ray diffraction and Raman spectroscopy, we report the composition and high-temperature induced phase transition in the system LiZnV1-xAsxO4 (0 ≤ x ≤ 1). Both techniques showed that the increase of arsenic amount induced a structural transition from R-3 LiZnVO4 type to LiZnAsO4 type belonging to R3 space group, the transition occurring between x = 0.7 and x = 0.8. Furthermore, increasing temperature for the compositions (0.8 ≤ x ≤ 1) manifests a transition from the LiZnAsO4 structural type with R3 space group to the R-3 LiZnVO4 structural type. For this series, the transition from the space group R3 to the centro-symmetric space group R-3 shows considerable changes in the compositional and temperature dependencies of the bands: spectral positions of all the observed Raman bands exhibit shifts linearly proportional to the temperature increase, with points of shift-rate changes revealing a symmetry change. The Raman-spectra based temperature-composition phase diagram confirms the results obtained using the method of Rietveld refinements, thus showing the R-3 to R3 transition occurring between x = 0.7 and 0.8.",
keywords = "High temperature Raman spectroscopy, LiZnV<inf>1-</inf><inf>x</inf>As<inf>x</inf>O<inf>4</inf>, Phase transition, Phenacite structure, Rietveld refinements, X-ray diffraction",
author = "B. Manoun and M. Azrour and P. Lazor and M. Azdouz and L. Bih and S. Benmokhtar and Rachid Essehli and {El Ammari}, L.",
year = "2015",
month = "7",
day = "16",
doi = "10.1016/j.saa.2015.07.025",
language = "English",
volume = "151",
pages = "956--964",
journal = "Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy",
issn = "1386-1425",
publisher = "Elsevier",

}

TY - JOUR

T1 - High temperature and composition induced phase transitions in LiZnV1-xAsxO4 phenacites

T2 - Crystal structure and Raman spectroscopy studies

AU - Manoun, B.

AU - Azrour, M.

AU - Lazor, P.

AU - Azdouz, M.

AU - Bih, L.

AU - Benmokhtar, S.

AU - Essehli, Rachid

AU - El Ammari, L.

PY - 2015/7/16

Y1 - 2015/7/16

N2 - Abstract In this work, using techniques of X-ray diffraction and Raman spectroscopy, we report the composition and high-temperature induced phase transition in the system LiZnV1-xAsxO4 (0 ≤ x ≤ 1). Both techniques showed that the increase of arsenic amount induced a structural transition from R-3 LiZnVO4 type to LiZnAsO4 type belonging to R3 space group, the transition occurring between x = 0.7 and x = 0.8. Furthermore, increasing temperature for the compositions (0.8 ≤ x ≤ 1) manifests a transition from the LiZnAsO4 structural type with R3 space group to the R-3 LiZnVO4 structural type. For this series, the transition from the space group R3 to the centro-symmetric space group R-3 shows considerable changes in the compositional and temperature dependencies of the bands: spectral positions of all the observed Raman bands exhibit shifts linearly proportional to the temperature increase, with points of shift-rate changes revealing a symmetry change. The Raman-spectra based temperature-composition phase diagram confirms the results obtained using the method of Rietveld refinements, thus showing the R-3 to R3 transition occurring between x = 0.7 and 0.8.

AB - Abstract In this work, using techniques of X-ray diffraction and Raman spectroscopy, we report the composition and high-temperature induced phase transition in the system LiZnV1-xAsxO4 (0 ≤ x ≤ 1). Both techniques showed that the increase of arsenic amount induced a structural transition from R-3 LiZnVO4 type to LiZnAsO4 type belonging to R3 space group, the transition occurring between x = 0.7 and x = 0.8. Furthermore, increasing temperature for the compositions (0.8 ≤ x ≤ 1) manifests a transition from the LiZnAsO4 structural type with R3 space group to the R-3 LiZnVO4 structural type. For this series, the transition from the space group R3 to the centro-symmetric space group R-3 shows considerable changes in the compositional and temperature dependencies of the bands: spectral positions of all the observed Raman bands exhibit shifts linearly proportional to the temperature increase, with points of shift-rate changes revealing a symmetry change. The Raman-spectra based temperature-composition phase diagram confirms the results obtained using the method of Rietveld refinements, thus showing the R-3 to R3 transition occurring between x = 0.7 and 0.8.

KW - High temperature Raman spectroscopy

KW - LiZnV<inf>1-</inf><inf>x</inf>As<inf>x</inf>O<inf>4</inf>

KW - Phase transition

KW - Phenacite structure

KW - Rietveld refinements

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=84937211047&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84937211047&partnerID=8YFLogxK

U2 - 10.1016/j.saa.2015.07.025

DO - 10.1016/j.saa.2015.07.025

M3 - Article

VL - 151

SP - 956

EP - 964

JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

SN - 1386-1425

M1 - 13919

ER -