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张怀研究团队发现硅酸钙钙钛矿前驱软化现象
孙涛-张怀研究团队采用机器学习势方法,对CaPv的波速进行了深入研究。机器学习势方法保持了第一性原理的精度,同时大大提高了模拟效率和规模,从而得以观察到前人未能发现的新现象。研究表明,在通常地幔温压条件下,CaPv的波速与地幔PREM模型十分接近,难以通过地震学观测识别。 但在对应冷俯冲板片在下地幔底部的温压条件,CaPv将处于四方-立方相转变的边缘,此时立方相CaPv会显示出强烈的前驱软化 ...
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