Bidimensional sodium ionic conduction of oxyborates Na2M2(BO3)2O (M = Al, Ga) and Na2−2xCaxGa2(BO3)2O (x = 0.25, 0.50)
Résumé
Crystalline samples of Na2M2(BO3)2O (M = Al, Ga), Na1.5Ca0.25Ga2(BO3)2O and NaCa0.5Ga2(BO3)2O are prepared by conventional
high temperature solid state synthesis technique. Temperature dependent impedance spectroscopy measurements are performed. For
Na2Al2(BO3)2O and Na2Ga2(BO3)2O, high and low temperature regimes have to be distinguished. Only one regime is observed for the
calcium-substituted samples Na1.5Ca0.25Ga2(BO3)2O and NaCa0.5Ga2(BO3)2O.