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Basic knowledge of a diamond, diamond is the three-dimensional reticular structure, the smallest carbon ring is a six membered ring, the smallest closed carbon ring is ten membered ring, the closed ten membered carbon rings is very important, it is making up the cell's main carbon ring, six carbon atoms in the unit cell the six surfaces of the heart, the remaining four cell located in the internal, their another carbon atom is the cell of the four vertices. Diagonal of the four vertices of the tetrahedron - which is another four vertices, the ten membered ring of the diagonal is cell edge length. 2. The diamond crystal structure is cubic. 金刚石的结构是面心立方格子，C原子分布于8个顶角和 6个面心，晶胞内部还有4个碳原子，故一个晶胞共有8个碳原子．（8×1/8+6×1/2+4） 3，金刚石晶胞棱长的计算： 碳碳键长＝0.154纳米 (这是已知的测定数据) 晶胞的体对角线L＝4倍碳碳键长 (这一结论不用自己再去推算, 详见晶体学中的有关计算，如：黄昆原著<固体物理学>第一章<晶体结构>) 设晶胞的棱长为X，由勾股定理不难证明晶胞的对角线L=√3X, 则√3X=L=4×0.154 =0.616(纳米)= 故X=0.616÷√3=0.616/1.73=0.356nm(纳米)=0.356×10-7 厘米 4，金刚石密度的计算： 一个晶胞的体积＝[0.36×10-7](厘米)3；，一摩晶胞的体积＝[0.356×10-7]3 ×6.02×1023(厘米)3 一摩晶胞的质量＝8×12=96(克)，则密度＝96克/[0.356×10-7]3 ×6.02×1023(厘米)3＝3.55克／(厘米)3