论文部分内容阅读
题目（1）中学教材上图示了NaCl晶体结构，它向三维空间延伸得到完美晶体。NiO（氧化镍）晶体的结构与NaCl相同，Ni2+与最邻近O2-的核间距离为a×10-8cm，计算NiO晶体的密度（已知NiO的摩尔质量为74．7g·mol－1）。（2）天然的和绝大部分人工制备的晶体都存在各种缺陷，例如在
Topics (1) The NaCl crystal structure is illustrated in the textbooks of high school. It extends to the three-dimensional space to obtain a perfect crystal. The crystal structure of NiO (nickel oxide) is the same as that of NaCl, and the distance between Ni2+ and the nearest neighbor of O2- is a×10-8cm. The density of NiO crystal is calculated (the molar mass of NiO is known as 74.7g·mol-1). . (2) Various defects exist in natural and most artificially prepared crystals, for example, in