Phase transitions of cesium azide at pressures up to 30 GPa studied using in situ Raman spectroscopy

Medvedev SA, Barkalov OI, Naumov P, Palasyuk T, Evers J, Klapoetke TM, Felser C (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Journal of Applied Physics AIP Publishing

Book Volume: 117

Article Number: 165901

Journal Issue: 16

DOI: 10.1063/1.4918911

Abstract

Cesium azide has been studied by Raman spectroscopy at pressures up to ?30 GPa at room temperature. The sequence of phase transitions to Phase III (at 0.5 GPa), Phase IV (at 4.3 GPa), and Phase V (at ?19 GPa) has been observed in agreement with recent X-ray diffraction studies. Phase III has been found to adopt a monoclinic C2/m structure with two azide anions in nonequivalent positions, where one set of azide anions appears to be orientationally disordered according to the observed Raman spectra. The transition to Phase IV has been associated with orientational ordering of azide anions, while the transition to Phase V has been shown to proceed with a lowering of crystal symmetry. Moreover, spectroscopic features indicate a possible change of bonding in CsN3 toward formation of covalent bonds at high pressures.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Polska Akademia Nauk (PAN) / Polish Academy of Sciences PL Poland (PL) Ludwig-Maximilians-Universität (LMU) DE Germany (DE)

How to cite

APA:

Medvedev, S.A., Barkalov, O.I., Naumov, P., Palasyuk, T., Evers, J., Klapoetke, T.M., & Felser, C. (2015). Phase transitions of cesium azide at pressures up to 30 GPa studied using in situ Raman spectroscopy. Journal of Applied Physics, 117(16). https://doi.org/10.1063/1.4918911

MLA:

Medvedev, S. A., et al. "Phase transitions of cesium azide at pressures up to 30 GPa studied using in situ Raman spectroscopy." Journal of Applied Physics 117.16 (2015).

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