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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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2楼2011-03-25 11:45:47
3楼2011-03-25 23:13:08
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ll921(金币+19): 谢谢你 2011-03-26 07:21:15
ringzhu(金币+2, 翻译EPI+1): 欢迎常来~~ 2011-03-26 13:14:04
ll921(金币+19): 谢谢你 2011-03-26 07:21:15
ringzhu(金币+2, 翻译EPI+1): 欢迎常来~~ 2011-03-26 13:14:04
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翻译: 有趣的和需要注意的是,文献[26]中倾角扭曲的ABO3钙钛矿的V值是基于这样的假设,即钙钛矿的V值可以经验地表达为B-O键键长(正八面体的热膨胀系数V,oct)和BO6八面体骨架的倾角之和(括号内式子不详)。因此,热膨胀系数的计算只考虑到了BO6八面体,而A-O键则通过……被间接地考虑在内。我们想在此指出,这种方法与所谓的多面体法很相似,而这种基于比较晶体化学和由Hazen和Finger提出的多面体法在预测许多固体的弹性性能方面被证明是有用的[41,42]。 另,楼主是凝聚态物理专业的,请问四氧化三铁为什么有磁性呢?我想知道具体的结构原因,有一同学问我,我不是很懂,外行,见笑了。 |
4楼2011-03-26 00:49:14
5楼2011-03-26 07:49:54










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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