The conductivity of the La-containing oxyapatite, Ca10-xLax(VO4)6O1+x/2□1-x/2, where x was between 0 and 2, was measured by using complex impedance methods at 350 to 900C (figure 7). The frequency-resolved spectra of the conductivity revealed the temperature-dependence of conduction regimes such as hopping, relaxation hopping and vibrational movements for mobile ions.

Electrical Properties of Lanthanum Containing Vanadocalcic Oxyapatite. H.Benmoussa, M.Mikou, A.Bensaoud, A.Bouhaouss, R.Morineaux: Materials Research Bulletin, 2000, 35[3], 369-75