The Colour Problem of Mercuric Oxide X-Ray Studies
The Colour Problem of Mercuric Oxide X-Ray Studies
复制标题
氧化汞X射线研究的颜色问题
DOI：
10.1524/zpch.1973.86.1_2.001
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
F. Ismail
中科院分区：
文献类型：
--
作者：
M. S. Farag;Z. Hanafi;F. Ismail
通过电子计数器记录淡黄色、黄色、橙色和红橙色形式的氧化汞的粉末X射线衍射图。他们揭示了这四种形式具有斜方结构。没有观察到斜方晶系中存在砖红色六方晶系的迹象。随着颜色从浅黄色变为红橙色，平均微应变逐渐减小。观察到的和计算出的结构因子之间的比较表明晶格缺陷的存在。密度的相对变化和晶胞尺寸的相对变化表明，这些缺陷是由于肖特基缺陷造成的，这种缺陷在浅黄色样品中普遍存在，并且比其他形式的缺陷更大。
Powder x-ray diffraction patterns of pale yellow, yellow, orange, and red orange forms of mercuric oxide are recorded by an electronic counter. They reveal that the four forms have an orthorhombic structure. No indication of the presence of a brick red hexagonal form in the orthorhombic form is observed. The average micro-strains decrease progressively as the colour passes from pale yellow to red orange. A comparison between the observed and calculated structure factors indicates the presence of lattice imperfections. The relative variation of density and that of the unit cell dimensions shows that these imperfections are due to Schottky defects, which are prevailing and are greater in the pale yellow sample than in the other forms.