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Using a back-reflection, flat-film camera and an extrapolation technique, precision determination of the lattice constant of sodium chlorate has been made at different temperatures between the range 30-232 °C. From these, by a graphical treatment, the coefficients of thermal expansion at various temperatures have been evaluated. An equation is also given for evaluating the coefficient of expansion at any temperature.These coefficients of expansion show a temperature rate of variation higher than the one reported by Sharma (1950a) from macroscopic measurements. An explanation for this difference is attempted in terms of imperfections in a single crystal. IntroductionSodium chlorate has been the subject of numerous studies because of its simple structure and many of its interesting properties. Zachariasen (1929) gave the length of the unit cell as 6.570 _+ 0.006 kX. (6.583 /~). Htiber (1940) studied the mixed crystals of sodium chlorate and sodium bromate and gave the lattice constant of sodium chlorate as 6.568*_+ 0.001 •. Solhelm, Konrad & Vegard (1947) report a value of 6.5722* (converted from kX. to /~ units). In view of the discrepancies in these values an accurate redetermination of the lattice constant was thought to be worthwhile.Data on the thermal expansion of this salt have been reported by Mason (1946) and Sharma (1950a