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【求助】關(guān)于異質(zhì)同構(gòu)的問(wèn)題 已有2人參與
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問(wèn)大家一個(gè)低級(jí)的問(wèn)題,異質(zhì)同構(gòu)的晶體其點(diǎn)群應(yīng)該是一樣的吧,比如都是正交晶系,那P222與Pc21n點(diǎn)群一樣嗎?非常迷糊。在線尋求幫助,謝謝! [ Last edited by nicole525 on 2010-5-28 at 16:04 ] |
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1. Two crystals are said to be isomorphous if (a) both have the same space group and unit-cell dimensions and (b) the types and the positions of atoms in both are the same except for a replacement of one or more atoms in one structure with different types of atoms in the other (isomorphous replacement), such as heavy atoms, or the presence of one or more additional atoms in one of them (isomorphous addition). Isomorphous crystals can form solid solutions. 2. Two crystals are said to be isostructural if they have the same structure, but not necessarily the same cell dimensions nor the same chemical composition, and with a 'comparable' variability in the atomic coordinates to that of the cell dimensions and chemical composition. For instance, calcite CaCO3, sodium nitrate NaNO3 and iron borate FeBO3 are isostructural. One also speaks of isostructural series, or of isostructural polymorphs or isostructural phase transitions. ---- 希望樓主用得著 |
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