INFLUENCE OF DEFECTS FORMATION WAY ON PROPERTIES OF PROTON CONDUCTORS BASED ON LANTHANUM SCANDATE

The structure and properties of proton conductors based on LaScO 3 synthesized by acceptor doping and the creation of a deficiency in La cation were studied. It has been shown that the number of intercalated protons in the oxide lattice increases with an increase in the degree of cationic doping and is higher when doped with strontium than calcium. It has been noted that in lanthanum scandate samples with cationic non-stoichiometry, the number of intercalated protons decreases with increasing lanthanum deficiency, which is probably due to the possibility of binding oxygen vacancies V O •• to (La La ''' - V O •• )' complexes and blocking their participation in the process of water dissolution. The activation energies of the conductivity of the volume and grain boundaries of lanthanum scandate synthesized by various methods are determined. It was shown that the conductivity and activation energy of conductivity of the volume of grains of samples doped with strontium are higher than when doped with calcium. It is noted that the activation energy of conductivity of samples with cationic non-stoichiometry is practically independent of the lanthanum deficiency.

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