X-ray emission studies of some REGaO3 single crystals

Measurements were made on some X-ray emission spectra of gallium and rare earths in LaGaO3, PrGaO3 and NdGaO3. The single crystals investigated were grown from high temperature solutions by slow cooling. A weak overlap of 5d electrons of lanthanum with 2p electrons of oxygen was confirmed in LaGaO3, similar to the situation for an La2 − xSrxCuO4 superconducting material and BaLaGa3O7. A strong influence of the Ga-O orbital overlap on the 3d shells of gallium was revealed in PrGaO3. Participation of the 4f electrons in the valence band in NdGaO3 is also compared with the situation in an Nd1.1Ba1.9Cu3Ox super-conducting material.