Single-crystal elasticity of SrCO<sub>3</sub> by Brillouin spectroscopy

Biedermann, Nicole; Winkler, Björn; Speziale, S.; Reichmann, Hans-Josef; Koch‐Müller, Monika

doi:10.1080/08957959.2017.1289193

Cited by 19 publications

(18 citation statements)

References 32 publications

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“…Accordingly, we expected lower Sr/Ca and higher Mg/Ca to correspond with greater Young's modulus and hardness, based on established relationships with SST (Smith et al 1979;Mitsuguchi et al 1996). Differences in substitution energetics also support this, as smaller (larger) atoms should correspond with greater (lower) mechanical properties (Menadakis et al 2008;Biedermann et al 2017). In contrast, when data from all cores were combined, greater Young's moduli and hardness were associated with increased Sr/Ca, whereas increased Mg/Ca and Ba/Ca were found in samples with lower moduli and hardness (Fig.…”

Section: Trace Elements and Coral Skeletal Propertiesmentioning

confidence: 79%

“…Such defects can have a strengthening, weakening, or minimal impact on the mechanical properties, depending on their size and concentration (Ma et al 2008;Kim et al 2016;Melbourne et al 2018). In bulk minerals, Young's modulus decreases with increasing cation radius, from 69 GPa (Aragonite, CaCO 3 ) to 64 GPa (Strontianite, SrCO 3 ) to 48 GPa (Witherite, BaCO 3 ) (Biedermann et al 2017). Computer simulations of Sr doping in calcite (0.8 atom% Sr, $ 8300 ppm) and aragonite (0.6 atom% Sr, $ 6250 ppm) found considerable changes in calcite, but no effect of Sr substitution on the aragonite lattice (Stashans et al 2007).…”

Section: Trace Elements and Coral Skeletal Propertiesmentioning

confidence: 99%

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Environmental impact on the mechanical properties of Porites spp. corals

et al. 2021

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Despite the economic and ecological importance of corals’ skeletal structure, as well as their predicted vulnerability to future climate change, few studies have examined the skeletal mechanical properties at the nanoscale. As climate change is predicted to alter coral growth and physiology, as well as increase mechanical stress events (e.g., bioerosion, storm frequency), it is crucial to understand how skeletal mechanical properties change with environmental conditions. Moreover, while material properties are intimately linked to the chemical composition of the skeleton, no previous study has examined mechanical properties alongside carbonate geochemical composition. Using Porites coral cores from a wide range of reef environments (Thailand, Singapore, Taiwan), we correlated coral’s micro-mechanical properties with chemical composition. In contrast to previous mechanical measurements of reef-building corals, we document unprecedented variability in the hardness, stiffness, and micro-cracking stress of Porites corals across reef environments, which may significantly decrease the structural integrity of reef substrate. Corals from environments with low salinity and high sedimentation had higher organic content and fractured at lower loads, suggesting that skeletal organic content caused enhanced embrittlement. Within individual coral cores, we observed seasonal variability in skeletal stiffness, and a relationship between high sea surface temperature, increased stiffness, and high-density. Regionally, lower Sr/Ca and higher Mg/Ca coincided with decreased stiffness and hardness, which is likely driven by increased amorphous calcium carbonate and skeletal organic content. If the coral is significantly embrittled, as measured here in samples from Singapore, faster erosion is expected. A decrease in skeletal stiffness will decrease the quality of reef substrate, enhance the rate of bioerosion by predators and borers, and increase colony dislodgement, resulting in widespread loss of structural complexity.

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Section: Trace Elements and Coral Skeletal Propertiesmentioning

confidence: 79%

Section: Trace Elements and Coral Skeletal Propertiesmentioning

confidence: 99%

Environmental impact on the mechanical properties of Porites spp. corals

et al. 2021

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“…A plot of the Eulerian strain against the normalized pressure (f-F plot) (Fig. 7b) indicates that a third-order Birch-Murnaghan equation of state is necessary to fit the pressure-volume (P-V) data of SrCO 3 , which is expressed as follows (Birch, 1947;Angel et al, 2014):…”

Section: Compressibility Of Srco 3 -I and Srco 3 -Iimentioning

confidence: 99%

Equation of state and high-pressure phase behaviour of SrCO<sub>3</sub>

et al. 2020

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Abstract. The high-pressure phase transition of strontianite (SrCO3) was investigated at ambient temperature by means of powder and single-crystal X-ray diffraction. The samples were compressed in a diamond anvil cell to a maximum pressure of 49 GPa. Structure refinements confirm the existence of SrCO3 in the low pressure aragonite-type phase Pmcn (62) up to about 26 GPa. Above this pressure, SrCO3 transforms into a high-pressure phase with post-aragonite crystal structure Pmmn (59). Fitting the volume extracted from the compression data to the third-order Birch–Murnaghan equation of state for the low-pressure phase of SrCO3 yields K0=62.7(6) GPa and K0′=3.2(1), and for the high-pressure phase this yields K0=103(10) GPa and K0′=2.3(6). The unit cell parameters change non-uniformly, with the c axis being 4 times more compressible than the a and b axes. Our results unequivocally show the existence of a Pmmn structure in SrCO3 above 26 GPa and provide important structural parameters for this phase.

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“…In contrast to ultrasound measurements, where samples with well defined faces and minimum size of a few hundreds of µm are required [19], crystals of arbitrary shape as small as a few µm can be investigated with TDS measurements. Furthermore, the new method is suitable for opaque systems as well, which are difficult to measure with Brillouin scattering [24]. Finally, the data collection in a TDS experiment is much faster than typically required for Inelastic X-ray (IXS) or neutron (INS) scattering [25,26].…”

Section: Introductionmentioning

confidence: 99%

Structural, elastic and vibrational properties of celestite, SrSO₄, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

Girard¹,

Stękiel²,

Spahr³

et al. 2018

J. Phys.: Condens. Matter

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In order to resolve inconsistencies encountered in published data for SrSO4, the elasticity and the phase stability of celestite has been studied using thermal diffuse scattering, high pressure powder synchrotron X-ray diffraction, Raman scattering and DFT calculations. The structure of SrSO4 is found to be stable up to 62 GPa at ambient temperature. The preferred values for the components of the elastic stiffness tensor have been determined using X-ray thermal diffuse scattering and are (in GPa): c11 = 105, c22 = 92, c33 = 114, c44 = 16, c55 = 31, c66 = 26, c12 = 40, c13 = 52, c23 = 37. The preferred value for the bulk modulus is K=62(2) GPa. This work shows that thermal diffuse scattering collected at two temperatures allows the determination of the full elastic tensor of crystals with low space group symmetry.

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Single-crystal elasticity of SrCO₃ by Brillouin spectroscopy

Abstract: The elastic stiffness tensor c ij of synthetic strontianite (SrCO 3 ) was determined by Brillouin spectroscopy at ambient conditions. An inversion procedure based on Christoffel's equation was used to determine the 9 independent elastic coefficients of

Cited by 19 publications

References 32 publications

Environmental impact on the mechanical properties of Porites spp. corals

Environmental impact on the mechanical properties of Porites spp. corals

Equation of state and high-pressure phase behaviour of SrCO<sub>3</sub>

Structural, elastic and vibrational properties of celestite, SrSO₄, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

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Single-crystal elasticity of SrCO3 by Brillouin spectroscopy

Abstract: The elastic stiffness tensor c ij of synthetic strontianite (SrCO 3 ) was determined by Brillouin spectroscopy at ambient conditions. An inversion procedure based on Christoffel's equation was used to determine the 9 independent elastic coefficients of

Cited by 19 publications

References 32 publications

Environmental impact on the mechanical properties of Porites spp. corals

Environmental impact on the mechanical properties of Porites spp. corals

Equation of state and high-pressure phase behaviour of SrCO&lt;sub&gt;3&lt;/sub&gt;

Structural, elastic and vibrational properties of celestite, SrSO4, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

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Single-crystal elasticity of SrCO₃ by Brillouin spectroscopy

Equation of state and high-pressure phase behaviour of SrCO<sub>3</sub>

Structural, elastic and vibrational properties of celestite, SrSO₄, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering