Abnormal Elasticity of Single-Crystal Magnesiosiderite across the Spin Transition in Earth’s Lower Mantle

Fu, Suyu; Yang, Jing; Lin, Jung‐Fu

doi:10.1103/physrevlett.118.036402

Cited by 41 publications

(30 citation statements)

References 58 publications

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“…Liu et al, 2019), which results in a reduction in the unit-cell volume and significant changes in vibrational properties (Cerantola et al, 2015;Lin et al, 2012;Spivak et al, 2014;Weis et al, 2017). Thus far, the Fe 2+ spin transition in (Mg,Fe)CO 3 has been diagnosed based on the abrupt reduction of the unit-cell volume in XRD measurements (Farfan et al, 2012;Lavina et al, 2009;Lin et al, 2012;Liu et al, 2014Liu et al, , 2015Nagai et al, 2010) and significant changes in the Raman shifts of vibrational modes in both optical and X-ray Raman spectroscopic studies (Cerantola et al, 2015;Fu et al, 2017;Lin et al, 2012;Spivak et al, 2014;Weis et al, 2017). Across the Fe 2+ spin transition, the reduction of total spin momentum in Fe 2+ can be captured by X-ray emission spectroscopy (Mattila et al, 2007).…”

Section: Characterizations Of the Fe 2+ Spin Transition In (Mgfe)co mentioning

confidence: 99%

“…The concentration, valence, and spin states of Fe in mantle minerals could significantly influence the mantle seismic velocities, which could help explain some seismically observed heterogeneities (Fu et al, 2017;Liu et al, 2018;Wu & Wentzcovitch, 2014). The definitions of V P and V S splitting anisotropies are as follows:…”

Section: Anomalous Elastic Properties Across the Spin Transitionmentioning

confidence: 99%

“…where S ij is the elastic compliance; σ i and σ j are the ith and jth stress components, respectively, in the Voigt notation; and G HS , G LS are the Gibbs free energies of the HS and LS states, respectively (Wu et al, 2013;Fu et al, 2017). The corresponding elastic constants C ij can be calculated based on the relationship between C ij and S ij (Fu et al, 2017). The third term on the right-hand side of equation (12 This is because n LS is an even function of the shear stress components (Fu et al, 2017).…”

Section: Anomalous Elastic Properties Across the Spin Transitionmentioning

confidence: 99%

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Spin Transition of Iron in Deep‐Mantle Ferromagnesite

Liu

Lin

2020

Geophysical Monograph Series

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Carbonates are believed to be major deep-mantle carbon carriers that transport carbon stored in deep-sea sediments and oceanic mantle lithosphere (serpentinized and carbonated depleted peridotite) to the Earth's deep interior through subduction. The subduction of slabs with carbon-rich materials thus serves as a major influx source for the deep-Earth carbon cycle (e.g. Dasgupta & Hirschmann, 2010; Kelemen & Manning, 2015). At the same time, reduced carbon species such as diamond, Fe-C alloys, and carbon-bearing melts can return back to shallower depths along mantle upwellings and be oxidized to carbonates or carbonatite melts (Rohrbach & Schmidt, 2011). The presence of carbonates in subducting slabs may trigger deep-focus earthquakes and could be manifested in strong V S radial anisotropy (ξ= [V SH / V SV ] 2 , where V SH and V SV are horizontally and vertically polarized shear waves, respectively) (J. Li et al., 2018). Therefore, studying the physical and chemical properties of carbonates under mantle pressure-temperature (P-T) conditions is critical for a better understanding of the deep carbon storage and cycling as well as its role in mantle geophysics and geochemistry. Carbonates in the magnesite-siderite-calcite (MgCO 3-FeCO 3-CaCO 3) ternary system are the major forms of crustal and mantle carbonates. In most parts of the mantle, magnesite (MgCO 3) is the most abundant carbonate among these end members because of its

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Section: Characterizations Of the Fe 2+ Spin Transition In (Mgfe)co mentioning

confidence: 99%

Section: Anomalous Elastic Properties Across the Spin Transitionmentioning

confidence: 99%

Section: Anomalous Elastic Properties Across the Spin Transitionmentioning

confidence: 99%

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Spin Transition of Iron in Deep‐Mantle Ferromagnesite

Liu

Lin

2020

Geophysical Monograph Series

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“…The P-T derivatives of the shear modulus (Table IV) were evaluated using the following equations: In general, the shear moduli C44 and G pressure dependence adheres to a well-known pattern [39][40][41] of the elastic constants behavior under pressure approaching phase transition.…”

Section: Co2 Single Crystal Brillouin Scattering and Thermoelastimentioning

confidence: 99%

Elastic stability of CO2 phase I under high temperature and pressure

et al. 2018

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Carbon dioxide exhibits a richness of high pressure polymorphs ranging from typical molecular solids to fully extended covalent solids, which, in turn, makes it a very appealing topic of fundamental research in condensed matter physics and simultaneously provides with valuable insights into the routes of developing possibly novel materials with advanced properties. This marked for the first time that the single crystal X-ray diffraction (XRD) and Brillouin scattering spectroscopy of CO2-I had been performed under high temperature and pressure. Densities, acoustic velocities and elastic moduli of CO2-I were obtained along 300 K, 400 K and 580 K isotherms up to the phase transition boundaries. CO2-I transforms to phase III and phase IV at room temperature (at 12.19 GPa) and 580 K (at 10.83 GPa), respectively. It was observed that high temperature suppresses pressure-induced stress in single crystal CO2-I. All elastic constants and thermal elasticity parameters of CO2-I were obtained and analyzed using finite-strain theory and thermal equation of state modeling. The C11, C12 and KS increase almost linearly with pressure, while shear moduli C44 and G exhibit a downward trend with pressure, showing a noticeable reduction at higher temperature. Elastic anisotropy A is practically independent of pressure along each isotherms and increases from 1.75 to 1.9.

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“…In the scientific context, interest in the T -dependence of elastic properties has revived in a variety of fields. Those range from observations of abnormal elastic properties in Earth’s lower mantel 6 to the investigation of magnetic field dependence of phonons in diamagnetic materials 7 . They further include magnetocaloric, elastocaloric, and barocaloric phenomena with modern cooling applications, and encompass new frontiers in the design of artificial materials 8–18 .…”

Section: Introductionmentioning

confidence: 99%

Elastic properties of superconductors and materials with weakly correlated spins

Binek

2017

Sci Rep

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It is shown that in the ergodic regime, the temperature dependence of Young’s modulus is solely determined by the magnetic properties of a material. For the large class of materials with paramagnetic or diamagnetic response, simple functional forms of the temperature derivative of Young’s modulus are derived and compared with experimental data and empirical results. Superconducting materials in the Meissner phase are ideal diamagnets. As such, they display remarkable elastic properties. Constant diamagnetic susceptibility gives rise to a temperature independent elastic modulus for ceramic and single crystalline superconductors alike. The thermodynamic approach established in this report, paves the way to tailor elastic material parameters through the design of magnetic properties.

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Abnormal Elasticity of Single-Crystal Magnesiosiderite across the Spin Transition in Earth’s Lower Mantle

Cited by 41 publications

References 58 publications

Spin Transition of Iron in Deep‐Mantle Ferromagnesite

Spin Transition of Iron in Deep‐Mantle Ferromagnesite

Elastic stability of CO2 phase I under high temperature and pressure

Elastic properties of superconductors and materials with weakly correlated spins

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