Thermal Stability And Microstructure Of Glasses And Glass-Ceramics In The System La2O3-Pbo-Mno-B2O3

Glasses have been synthesised in the system La2O3-PbO-MnO-B2O3 varying the MnO content in large compositional range between 10 and 70% mol. Glass ceramics containing La0,6Pb0,4MnO3 phase have been authorised directly by melt quenching method. Transition and crystallization temperatures have been determined by DTA. The increasing of the B2O3 content improves the thermal stability of the glasses. By TEM analysis, different type microheterogeneous structures have been observed in compositions rich in B2O3.