Abstract
We used X-ray powder diffraction and differential thermal analysis (DTA) to study the effects of temperature on the cell parameters and phase transitions in RbTi1-xNbxOPO4 (x = 0−0.9) crystals. The linear thermal expansion coefficients were calculated from the results of X-ray diffraction. We determined their Curie temperature (Tc) by the change in the slope of the evolution of the c parameter of the crystals with the temperature, which is a function of the Nb content in the crystals. The transition temperature from RTP orthorhombic to RbTiPO5 cubic phase and the decomposition temperature of this cubic phase, which are also functions of the Nb concentration in the crystals, were determined by DTA and X-ray diffraction. Finally, we also studied how the cell parameters of the RTP phase changed as the concentration of Nb in the crystals was increased at room temperature.
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