Ceramics-Silikáty 25, (2) 97 - 112 (1981)

Anomalous courses of properties are exhibited by germanate glasses (density, refractive index, activation energy of electrical conductivity, thermal expansion coefficient, and the number of oxygen atoms per 1 cm³ of glass). Tellurate glasses show anomalous courses of entropy of viscous flow, of thermal expansion and dielectric losses. These changes are ascribed to inversion of tellurates to polytellurates. A discussion is presented of the systems of anomalies involving a change in the "state" of oxygen atoms. The effect of combined ions is considered as one of conjunction of isovalent cations which is not primarily related to oxygen anomaly. The anomalies are suppressed by introduction of elements showing a high electronegativity.