Lattice parameters are the important crystal structural parameters of polycrystalline materials. 晶胞參數是多晶材料晶體結構的重要參數。
In generally, there were some crystal defects in the polycrystal materials, and was namely the inperfect crystal structure. 多晶材料中通常存在一些晶體缺陷，稱(chēng)之為晶體結構的不完整性。
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