THE EFFECT OF Nb:Ta RATIO ON THE LUMINESCENT PROPERTIES, STRUCTURAL AND MECHANICAL CHARACTERISTICS OF ERBIUM ORTHONIOBATES-TANTALATES CERAMICS

The study of the dependence of luminescent properties, structural and mechanical characteristics of ErNbхTa1–хO4 ceramics on the Nb:Ta ratio was conducted. It was found that single phase ErNbхTa1-хO4 ceramics (x = 0.7 and 1), where their structure was described in monoclinic symmetry with the spatial symmetry group I2/a, showed the best mechanical characteristics relative to other compositions. The maximum intensity of photoluminescence was observed in ErNbхTa1–хO4 ceramics. For the first time, Er absorption lines were on the photoluminescence spectrum of the host luminescence.