Abstract

By the use of a four-circle diffractometer with a solid- state detector, the integrated Bragg reflexion intensities from hemimorphite [Zn4Si2O7(OH)2.H2O] have been measured by energy-dispersive diffractometry at three energy values, including the region very near the Zn Kα absorption edge. The anomalous difference Patterson map obtained indicated Zn-Zn peaks. By the use of the anomalous-scattering effect to the maximum extent, the phases of one hundred reflexions have been deter- mined with a mean error of 15.4°

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