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【求助】关于异质同构的问题 已有2人参与
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问大家一个低级的问题，异质同构的晶体其点群应该是一样的吧，比如都是正交晶系，那P222与Pc21n点群一样吗？非常迷糊。在线寻求帮助，谢谢！ [ Last edited by nicole525 on 2010-5-28 at 16:04 ] |
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huahua1216
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2楼2010-05-28 16:29:18
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小木虫(金币+0.5):给个红包，谢谢回帖交流
yanhualover(金币+1):谢谢交流 2010-05-28 23:35:22
小木虫(金币+0.5):给个红包，谢谢回帖交流
yanhualover(金币+1):谢谢交流 2010-05-28 23:35:22
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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. ---- 希望楼主用得着  |
3楼2010-05-28 22:55:57