The crystal structures of CaMoO., SrMoO., SrWO., and BaWO, have been refined from neutron diffraction data taken in the (hOl) and (hhl) zones. Oxygen position refinement is started from the parameters proposed by SilIen and Nylander and results in an improvement of over an order of magnitude in the oxygen coordinates. A comparison of coordinates for the different compounds shows several systematic differences.
The specific heats of the pyrochlore compounds Y2Mo2O7 were measured below 20 K. The Y2Ru2O7 data were found to be well described by the expression C=γT+αT3 below 7 K with a γ value of 2.92±0.1 mJ/mole K2 and an α value of 0.236±0.015 mJ/mole K4. A correct description for the Y2Mo2O7 data was not obvious since there was, in addition to γT+αT3 contributions, a Schottky-like term with a maximum near 12 K plus a smaller contribution near 3.5 K of unknown origin. The γ and α values of 1.33±1 mJ/mole K2 and 0.973±0.06 mJ/mole K4, respectively, should be used with caution. Neutron diffraction data were taken at 300, 77, 13, and 4.2 K on Y2Mo2O7. The results indicated that no transition to an antiferromagnetically ordered state occurred down to 4.2 K.
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