The temperature dependence of the lattice parameters of ZnO was measured by x-ray powder-diffraction methods. Retrograde behavior was found to occur perpendicular to the c axis at 93°K. Lattice parameters at 4.2°K were a0=3.24826±0.00015Å, c0=5.2033±0.0018 Å. These results are compared with those for some other II-VI compounds.
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Robert R. Reeber (1970) studied this question.
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