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It is interesting to remind that the V-values in ref. [26] are based on the approximation [40] that V of a tilt-distorted ABO3 perovskite can be empirically expressed as a decoupled combination of changes of the B-O bond length (thermal expansion V,oct of regular octahedra) and the tilting angle of BO6 octahedral framework (thermal expansion according to V = V,oct + . The thermal expansion is thus calculated by considering only the BO6 octahedra while the A-O bond is taken into account indirectly via x. We parenthesize that such an approach is similar to the so-called polyhedral approach, based on comparative crystal chemistry and developed by Hazen and Finger which has been shown to be useful in predicting elastic properties of a large number of solids [41, 42]. |
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翻譯: 有趣的和需要注意的是,文獻[26]中傾角扭曲的ABO3鈣鈦礦的V值是基于這樣的假設,即鈣鈦礦的V值可以經驗地表達為B-O鍵鍵長(正八面體的熱膨脹系數(shù)V,oct)和BO6八面體骨架的傾角之和(括號內式子不詳)。因此,熱膨脹系數(shù)的計算只考慮到了BO6八面體,而A-O鍵則通過……被間接地考慮在內。我們想在此指出,這種方法與所謂的多面體法很相似,而這種基于比較晶體化學和由Hazen和Finger提出的多面體法在預測許多固體的彈性性能方面被證明是有用的[41,42]。 另,樓主是凝聚態(tài)物理專業(yè)的,請問四氧化三鐵為什么有磁性呢?我想知道具體的結構原因,有一同學問我,我不是很懂,外行,見笑了。 |
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