The synthesis and structural characterization of 15R-, 8H-, 6H‘-, and 10H-BaMnO3-x and 9R-Ba0.875Sr0.125MnO3 is described. Neutron powder diffraction data reveal a strong preference for the location of anion vacancies within the face-shared hexagonal layers of these phases. At high anion vacancy concentrations, Mn2O9-x dimer units become prevalent. Magnetic characterization indicates antiferromagnetic order in all phases. Ordering temperatures are in the range 250 K < T < 270 K and show a dependence on the fraction of cubic layers present in the stacking sequence.
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Adkin et al. (2007) studied this question.
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