PHASE TRANSITION IN NEW OXYGEN-IONIC CONDUCTORS ON BASE OF LANTHANUM MOLIBDATE La_2Mo_2O_9

摘要

Oxygen-conducting ceramics of ion-substituted La_2(Mo_(1-x)M_x)_2O_9 (M = Nb, Ta, Zr, and Ti) lanthanum molibdates were synthesized. The phases obtained were identified by X-ray diffraction analysis (DRON-3M; CuK_α) and electron microscopy (JEOL-35CF). The effect of the substitution of Mo~(+6) with penta- and tetravalent cations on the parameters of α and β phases of lanthanum molibdate and the phase transition was studied using dilatometry and thermogravimetry.