FIELD: materials for electrochemical devices. SUBSTANCE: invention relates to production of materials for electrochemical devices, namely, solid oxide electrolyte materials with proton conductivity based on calcium zirconate (CaZrO3), which can be used as an electrolyte material in proton-conducting solid oxide fuel cells used to obtain electricity. The material is calcium zirconate doped with phosphorus and has the following composition: CaZr0.95P0.05O3.025. EFFECT: high values of proton conductivity at pH2O = 2⋅10-2 atm. 1 cl, 4 dwg.