Abstract
The atomic scattering factors of manganese and oxygen atoms in manganous oxide (MnO) were determined by measuring the integrated x-ray intensities of reflections from powder sample at room temperature. The intensities measured on a relative scale for five differently colored samples within an experimental error of ±0.4 to 4% were transformed to the absolute values by experimental scaling factors. The atomic scattering factors obtained were compared with those calculated by Watson and Freeman and by Suzuki and proved that the atoms were in the state of divalent ions. The tabulated anomalous dispersion terms were found to be reliable for Cu and Cr Kα radiations.
The effect of non-spherical charge distributions was discussed by a comparison between the experimental and the theoretical factors.
The lattice constant at room temperature was determined to be 4.444±0.001 A and thermal expansion coefficient above the Néel point, 1.1×10−5 deg−1. The root mean square amplitudes of thermal vibration were determined to be 0.12±0.03 A (BMn=0.38 A2) and 0.13±0.03 A (Bo=0.45 A2), respectively fir Mn and O ions.
