Electronic and ionic conductivity of glasses inside the Li2O–MoO3–P2O5 system
2000; Elsevier BV; Volume: 132; Issue: 1-2 Linguagem: Inglês
10.1016/s0167-2738(00)00697-4
ISSN1872-7689
Autores Tópico(s)Luminescence Properties of Advanced Materials
ResumoA wide range of coloured electronic or mixed electronic–ionic glasses has been shown in the alkali oxide poor-region of the Li2O–MoO3–P2O5 system, next to the colourless ionic glasses located in the alkali oxide rich-region. These coloured glasses have been studied by electron paramagnetic resonance (EPR) spectroscopy. The Mo5+ and Mo6+ cation percentages have been evaluated for several series of glasses corresponding to either a fixed Li2O rate or a constant Mo/P ratio. The electronic and the ionic contributions to the total conductivity of these glasses have been determined. The existence of a polaronic hopping conduction mechanism between Mo5+ and Mo6+ cations is suggested in the purely electronic conductor glasses. An ion–polaron soft coupling is proposed in the ionic–electronic conductor glasses.
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