Thermal expansion of the wurtzite phase of ZnS was measured using a back-reflection Debye-Scherrer x-ray camera. Experimental results indicate that retrograde behavior is exhibited both perpendicular and parallel to the c axis at 60°±5°K. The molar volume decreases approximately 0.30% from 300° to 60°K and then increases slightly upon further cooling. Lattice parameters obtained at 25°C are a0=3.8226±0.0003 Å and c0=6.2605±0.0015 Å.
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