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An electron paramagnetic resonance (EPR) study of Er3+ ions in single crystals of RbTiOPO4 (RTP) is presented. The EPR spectra show the existence of six different Er3+ centres. The g-matrix has been determined for these centres from the analysis of the angular dependences of the spectrum in three planes of the crystal. The study supports that erbium can enter the Rb+ and Ti4+ low-symmetry sites of RTP. This conclusion differs from those for KTP:Er3+ and RTP codoped with Nb and Er. The different occupancies found for Er in these various crystals is suggested to be due to the differences in Er concentration. [ABSTRACT FROM AUTHOR]

We measured the ionic conductivity for two single crystals of RbTiOPO4 grown in self-fluxes with different chemical composition. Ionic conductivity depended on the composition of the self-flux solution in which the crystal was grown. One of the samples showed an anisotropic behavior along the three crystallographic axes while the other showed a nearly isotropic behavior of the ac conductivity. [ABSTRACT FROM AUTHOR]