105.
Phenomena and processes either new or not studied in-depth occurring in perovskite oxides and in systems which contain these
compounds are reported and summarized. The materials under consideration are well-known for specific properties, e.g., cerates
of alkaline earths are high-temperature proton conductors, manganates are electrode materials of SOFCs and show the effect
of colossal magnetoresistance or YBa
2Cu
3O
7 cuprates YBa
2Cu
3O
7 are “high-temperature” superconductors. The presented nontraditional approach consists of considering physical and chemical
phenomena and processes, which do not relate to the indicated main properties of the compounds. For instance, BaCeO
3 undoped and slightly doped has partially cerium in the form of Ce
+3, which provides the effect of blue luminescence which is controlled by thermochemical treatment; H
2YBa
2Cu
3O
7 manifests mixed proton-electron conduction at 400–550 K under water vapor of 100–300 Pa; La
0.67Ca
0,33MnO
2.84 can dissolve some part of water vapor as this occurs in traditional HTPC. The electrochemical cells Pd | HTPC | hydrocuprate
| HTPC | Pd and the more simple one Pd | HTPC | Pd show e.m.f. values near 1 V under certain conditions after polarization
by d.c. currents at 420–520 K under different atmospheres. The system water vapor — membrane of undoped BaCeO
3-hydride is described. Defect chemistry equations are used to describe some of the phenomena which are employed for the production
and storage of pure hydrogen.
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