Crystal structure modeling, electrical and thermal characterization of triple molybdates RbCrTi0.5(MoO_4)_3 (R=Fe, Cr)

摘要

The new triple molybdates of RbRTi_(0.5)(MoO_4) _3 (R=Fe, Cr) were synthesized by a ceramic route at 580-600 °C. Their crystal structures have been refined by Rietveld analysis of powder X-ray diffraction data on the single crystal data of isostructural CsFeZr _(0.5)(MoO_4)_3 (trigonal symmetry, space group R-3). The structure refinement converged to satisfactory values of the Rietveld parameters, Rp and Rwp, and goodness of fit. The lattice parameters, bond lengths and bond angles have been calculated from Full Proff program. The maximum value of RbCrTi_(0.5)(MoO_4)_3 conductivity was 0.57×10~(-2) S cm~(-1) at 50 °C.