Thermal Expansion of Delta and Epsilon Zirconium Hydrides

Abstract
The thermal expansion characteristics of polycrystalline delta (face‐centered‐cubic) zirconium hydride and epsilon (body‐centered‐tetragonal) zirconium hydride were determined between room temperature and 362°C and 300°C, respectively, by means of x‐ray diffraction techniques. The average linear thermal expansion coefficient for the delta phase is 2.98×10—6/°C for the range 24° to 362°C. For the epsilon phase, the average coefficients for the range 24° to 300°C are —1.4×10—6/°C and 30.6×10—6/°C for the a and c directions, respectively, and 9.3×10—6/°C for the randomly oriented polycrystalline material.

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