EPR OF V4-CRYSTALS( IN LITHIUM (SODIUM) AND TITANIUM OXYPHOSPHATE ANDSUPERIONIC CONDUCTIVITY OF THESE SINGLE)

X-band EPR spectra of V4+ in NaTiOPO4 (NTP) and alpha- and beta-modifi cation of LiTiOPO4 (alpha-, beta-LTP respectively), dielectric charact eristics (epsilon and tg delta) and conductivity or in NTP and alpha-L TP were investigated within the wide temperature intervals. The consta nts of spin-Hamiltonian (at room temperature) and the directions of ma gnetic axes Z were determined. EPR and structural data were compared. Models of V4+ paramagnetic centers in these single crystals were const ructed. The anisotropy of epsilon, tg delta and a with maximum values in the direction of a-axis for NTP and b-axis for alpha-LTP is observe d. The high temperature superionic conductivity caused by the motion o f Li+ ions in LTP and Na+ in NTP through the interstitial ''windows'' are suggested.