The Crystal Structure of Orpiment
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概要
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The structure of orpiment (As<SUB>2</SUB>S<SUB>3</SUB>) has been analysed using X-ray methods (Weissenl erg and oscillation photographs, Co <I>Ka</I>, λ=1.79A) . The unit cell has the dimensions, <I>a</I>=11.46A, <I>b</I>=9.66A, <I>c</I>=4.21A, β=90°, containing four molecules of As<SUB>2</SUB>S<SUB>3</SUB>. The space groap is <I>C</I><SUP>5</SUP><SUB>2A</SUB>-<I>P2</I><SUB>1</SUB>/n, with reflexions (<I>hOl</I>) and (<I>OkO</I>) being absent respectively when <I>h+l</I>. and <I>k</I> are odd. The structure is comnosed of As<SUB>2</SUB>S<SUB>3</SUB> layers held together by the weak van der Waals force. In the layer Asa toms are surrounded by three S atoms. S atoms are always shared by two As atoms. The interatomic distances and bond angles agree with ones in other compounds containing S and As.
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