Abstract
The conditions for equivalent positions on the (hkl) face of growing crystal are derived using symmetry elements of the space group. It is shown by the example of the sp. gr. D 162h that the conditions of equivalent position formation coincide with conditions of the reflection of diffracted beams by crystal. It is established that electron spin resonance (ESR) centers in barite, SO −4 (I) and SO −4 (II), with only two conjugate spectra with equal intensity out of four, and SO −4 (III), with a different intensity of conjugate spectra K αM = 2, are localized into the growth pyramid of the (001) face with a [010] step. SO −2 , SO −3 ,, and SO −4 (IV) centers, having an identical intensity of the conjugate ESR spectra with K αM = 2, are localized into the growth pyramid of the (210) face with a growth step [001].
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Original Russian Text © R.A. Khasanov, N.M. Nizamutdinov, N.M. Khasanova, V. M. Vinokurov, G.S. Morozov, A.O. Krivtsov, 2012, published in Kristallografiya, 2012, Vol. 57, No. 5, pp. 834–840.
On the 100th anniversary of the discovery of X-ray diffraction
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Khasanov, R.A., Nizamutdinov, N.M., Khasanova, N.M. et al. Derivation of the conditions for equivalent positions in crystals: The dissymmetrization of barite by electron spin resonance spectra. Crystallogr. Rep. 57, 751–757 (2012). https://doi.org/10.1134/S1063774512050070
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DOI: https://doi.org/10.1134/S1063774512050070