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commensurate和incommensurate的定義
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跟大家討論討論commensurate(公度)和incommensurate(非公度)的定義。 最近調研這方面的書和文章都沒有發(fā)現對這個概念的一個統(tǒng)一個定義。有文獻中說公度(不公度)相是一種在基本晶格上的附加某種公度(非公度)調制產生的,也有的說是由于存在兩個不同晶格標尺的相互競爭產生的,不知大家有什么見解? |
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Three types of hetero-phase interfaces are generally considered: coherent or commensurate, semi-coherent (or “dis-commensurate”) and incoherent or incommensurate. 應是共格、非共格。 A coherent interface arises when the two crystals match perfectly at the interface plane so that the two lattices are continuous across the interface. Whatever the chemical species, the interface plane has the same atomic configuration in the two phases, requiring the existence of a preferential orientation relationship between the two crystals. An incoherent interface generally results from a random orientation relationship between the nucleus and the matrix. But, it may also appear between crystals displaying a preferentialmisorientation if the interface plane is random (analogy with a grain boundary where, for a given coincidence, the plane may be symmetrical or not, constituted of dense planes or random planes of the crystals). |
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