X-ray determination of thermal expansion of zinc oxide

Lattice parameters of zinc oxide have been determined accurately at different temperatures between 27°C and 619°C. These data have been processed to evaluate the temperature variation of the coefficients of thermal expansion αa and αc and the results could be represented as follows: αa = 6.05 × 10−6 + 2.20 × 10−9t + 2.29 × 10−12t2°C−1 // αc = 3.53 × 10−6 + 2.38 × 10−9t + 9.24 × 10−14t2°C−1 where t is the temperature in °C.