Abstract
The dependence of bulk moduli on compositions has been studied for chalcogenide glasses and a-Si:H films. The modulus is nearly constant when the average coordination number ( Z) is smaller than 2.7, and increases drastically when Z ⪆ 2.7. This dependence differs from the theoretical result, which predicts the elastic phase transition at Z = 2.4. Origins of this disagreement are discussed.
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