THERMAL EXPANSION OF STRONTIUM TUNGSTATE

Accurate lattice parameters of strontium tungstate, an isotype of scheelite, have been determined as a function of temperature by the X-ray powder method in the temperature range 28 to 355° C. Both the lattice parameters are found to increase with temperature. Using these data, the two coefficients of thermal expansion, αa along the a-axis and αa along the c-axis, have been calculated. The temperature dependence of the coefficients could be expressed by the following equations: αa=5.88×10-6-25.63×10-10T + 59.49×10-12T2αc=13.20×10-6-18.18×10-10T+71.45×10-12T2. Here T is the temperature in °C. © 1969 Chapman and Hall.