Heterogeneous Structures In The Systems B₂O₃–MoO₃–Coo and B₂0₃–Mo0₃–Fe₂O₃

The phase separation regions of the systems B₀₃—Mo0₃—CoO and B₂0₃—Mo0₃-Fe₂O₃ were determined. The presence of different types of heterogeneous structures composed of glassy and crystalline phases was proven. In compositions located on the immiscibility-crystallization boundaries, complex micro-aggregates were observed by TEM. The crystalline phases were identified by XRD analysis. IR spectra of homogeneous glasses outside the immiscibility gap possess an intensive band at about 1100 cm−1 and bands with lower intensities around 860–680 and 470 cm−1. It is suggested that the amorphous network is build up by non-associated B0₃ and B0₄ groups together with Mo0₆ and Co0₆ units.