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The chemical bond parameters, that is ionicities and average energy gaps, for all types of chemical bonds in YBa 2 Cu 3 O 6+δ have been investigated with variation of oxygen content δ (δ = 0.0, 0.35, 0.45, 0.58, 0.64, 0.73, 0.78, 0.81, 0.95, 1.00). The theory used is the complex crystal chemical bond theory, which is the development of P-V-L theory. The two plateaus...
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