论文标题
casio $ _3 $ perovskite在较低地幔条件下的导热率
Thermal Conductivity of CaSiO$_3$ Perovskite at Lower Mantle Conditions
论文作者
论文摘要
地幔矿物的热导率（$κ$）是地球动力学建模的基本特性。它控制着地幔对流的样式以及地幔和核心冷却的时间尺度。立方casio $ _3 $ perovskite（CAPV）是下地幔（LM）（7 vol％）中第三大矿物。但是，尽管它很重要，但尚无对CAPV $κ$的理论或实验估计。由于其强大的非谐调性，对其性质的理论研究变得具有挑战性。相关的高压和温度下的实验测量同样具有挑战性。在这里，我们提出了使用已建立的声子准粒子方法获得的CAPV $κ$的$ ab $ $ $ INITIO $结果，该方法可以解决其强大的非harm谐。我们还提供$κ$的实验尺寸。预测和测量非常吻合，并且显示出令人惊讶的Cutic CAPV $κ$。尽管CAPV的$κ$相对较低，但如果考虑到较低的地幔$κ$，则可能会增加约10％。富含硬皮材料的地幔区域的$κ$将受到更大的影响。
Thermal conductivity ($κ$) of mantle minerals is a fundamental property in geodynamic modeling. It controls the style of mantle convection and the time scale of the mantle and core cooling. Cubic CaSiO$_3$ perovskite (CaPv) is the third most abundant mineral in the lower mantle (LM) (7 vol%). However, despite its importance, no theoretical or experimental estimate of CaPv's $κ$ exists. Theoretical investigations of its properties are challenging because of its strong anharmonicity. Experimental measurements at relevant high pressures and temperatures are equally challenging. Here we present $ab$ $initio$ results for CaPv's $κ$ obtained using an established phonon quasiparticle approach that can address its strong anharmonicity. We also offer experimental measurements of $κ$. Predictions and measurements are in good agreement and reveal a surprisingly large $κ$ for cubic CaPv. Despite its relatively low abundance, CaPv's $κ$ might increase the lower mantle $κ$ by approximately 10%, if accounted for. $κ$ of mantle regions enriched in crust material will be more strongly impacted.
