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Elastic properties of single crystal Bi12SiO20 as afunction of pressure and temperature and acousticattenuation effects in Bi12MO20 (M = Si, Ge and Ti)

Haussuehl, Eiken and Reichmann, Hans Josef and Schreuer, Jürgen and Friedrich, Alexandra and Hirschle, Christian and Bayarjargal, Lkhamsuren and Winkler, Björn and Alencar, Igor and Wiehl, Leonore and Ganschow, Steffen (2020):
Elastic properties of single crystal Bi12SiO20 as afunction of pressure and temperature and acousticattenuation effects in Bi12MO20 (M = Si, Ge and Ti).
In: Materials Research Express, 7 (2), pp. 025701. IOP Publishing, ISSN 2053-1591, e-ISSN 2053-1591,
DOI: 10.1088/2053-1591/ab6ad6,
[Article]

Abstract

A comprehensive study of sillenite Bi12SiO20 single-crystal properties, including elastic stiffness and piezoelectric coefficients, dielectric permittivity, thermal expansion and molar heat capacity, is presented. Brillouin-interferometry measurements (up to 27 GPa), which were performed at high pressures for the first time, and ab initio calculations based on density functional theory (up to 50 GPa) show the stability of the sillenite structure in the investigated pressure range, in agreement with previous studies. Elastic stiffness coefficients c(11) and c(12) are found to increase continuously with pressure while c(44) increases slightly for lower pressures and remains nearly constant above 15 GPa. Heat-capacity measurements were performed with a quasi-adiabatic calorimeter employing the relaxation method between 2 K and 395 K. No phase transition could be observed in this temperature interval. Standard molar entropy, enthalpy change and Debye temperature are extracted from the data. The results are found to be roughly half of the previous values reported in the literature. The discrepancy is attributed to the overestimation of the Debye temperature which was extracted from high-temperature data. Additionally, Debye temperatures obtained from mean sound velocities derived by Voigt-Reuss averaging are in agreement with our heat-capacity results. Finally, a complete set of electromechanical coefficients was deduced from the application of resonant ultrasound spectroscopy between 103 K and 733 K. No discontinuities in the temperature dependence of the coefficients are observed. High-temperature (up to 1100 K) resonant ultrasound spectra recorded for Bi12MO20 crystals revealed strong and reversible acoustic dissipation effects at 870 K, 960 Kand 550 K for M = Si, Ge and Ti, respectively. Resonances with small contributions from the elastic shear stiffness c(44) and the piezoelectric stress coefficient e(123) are almost unaffected by this dissipation.

Item Type: Article
Erschienen: 2020
Creators: Haussuehl, Eiken and Reichmann, Hans Josef and Schreuer, Jürgen and Friedrich, Alexandra and Hirschle, Christian and Bayarjargal, Lkhamsuren and Winkler, Björn and Alencar, Igor and Wiehl, Leonore and Ganschow, Steffen
Title: Elastic properties of single crystal Bi12SiO20 as afunction of pressure and temperature and acousticattenuation effects in Bi12MO20 (M = Si, Ge and Ti)
Language: English
Abstract:

A comprehensive study of sillenite Bi12SiO20 single-crystal properties, including elastic stiffness and piezoelectric coefficients, dielectric permittivity, thermal expansion and molar heat capacity, is presented. Brillouin-interferometry measurements (up to 27 GPa), which were performed at high pressures for the first time, and ab initio calculations based on density functional theory (up to 50 GPa) show the stability of the sillenite structure in the investigated pressure range, in agreement with previous studies. Elastic stiffness coefficients c(11) and c(12) are found to increase continuously with pressure while c(44) increases slightly for lower pressures and remains nearly constant above 15 GPa. Heat-capacity measurements were performed with a quasi-adiabatic calorimeter employing the relaxation method between 2 K and 395 K. No phase transition could be observed in this temperature interval. Standard molar entropy, enthalpy change and Debye temperature are extracted from the data. The results are found to be roughly half of the previous values reported in the literature. The discrepancy is attributed to the overestimation of the Debye temperature which was extracted from high-temperature data. Additionally, Debye temperatures obtained from mean sound velocities derived by Voigt-Reuss averaging are in agreement with our heat-capacity results. Finally, a complete set of electromechanical coefficients was deduced from the application of resonant ultrasound spectroscopy between 103 K and 733 K. No discontinuities in the temperature dependence of the coefficients are observed. High-temperature (up to 1100 K) resonant ultrasound spectra recorded for Bi12MO20 crystals revealed strong and reversible acoustic dissipation effects at 870 K, 960 Kand 550 K for M = Si, Ge and Ti, respectively. Resonances with small contributions from the elastic shear stiffness c(44) and the piezoelectric stress coefficient e(123) are almost unaffected by this dissipation.

Journal or Publication Title: Materials Research Express
Journal volume: 7
Number: 2
Publisher: IOP Publishing
Uncontrolled Keywords: sillenites; elasticity; piezoelectricity; ultrasound damping; resonant ultrasound spectroscopy; Brillouin spectroscopy; high pressure and temperature HEAT-CAPACITY MEASUREMENTS; CLOSED-FORM EXPRESSIONS; PHOTOREFRACTIVE CRYSTALS; BRILLOUIN-SCATTERING; BISMUTH; BI12TIO20; WAVES
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 06 Jul 2020 06:15
DOI: 10.1088/2053-1591/ab6ad6
Official URL: https://iopscience.iop.org/article/10.1088/2053-1591/ab6ad6
Projects: German Research Foundation (DFG), Grant Numbers HA5137/3, HA5137/5, German Research Foundation (DFG), Grant Number SPP-1236 (FR 2491/2-1)
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