The optimal chemical compositions have been chosen for the development of heating elements based on ferroelectricsemiconducting ceramics. The processes, which take place during the synthesis of the PTCR yttrium-doped barium titanate ceramics, have been analysed. The factors affecting ceramics electrophysical properties have been studied. In V.I. Vernadskii Institute of General and Inorganic Chemistry of NAS of Ukraine various doped by barium titanate thermos-stabilized ceramic heating elements with working temperature automatic control have been developed. These heating elements have been used by State Enterprise "Kharkiv design office for engine building" as a basis of oil heating devices which have been developed for the utilization in oil tanks of "ЕА-10М" power units. This allowed a significant (by 10-20^oС) reduction of the starting temperature of a diesel engine in a cold season.

1. Makovec D., Drofenik M. Microstructural Changes during the Reduction. Reoxidation Process in Donor-Doped BaTiO3 Ceramics. J. Am. Ceram. Soc. 2008. 3(10):2593-2599.
2. Belous A.G., V'yunov O.I., Yanchevskii O.Z., Kovalenko L.L. Thermodynamic and Experimental Investigation of the Effect of Rare-earth Ions (Ln3+) Nature on the Posistor Properties of Ba1–xLn3+xTiO3. Key Engineering Materials. 1997. 132-136, Part 1. P. 1313-1316.
https://doi.org/10.4028/www.scientific.net/KEM.132-136.1313
3. Evans H.T. An X-Ray Diffraction Study of Tetragonal Barium Titanate. Acta Cryst. 1961. no 14: 1019-1026.
https://doi.org/10.1107/S0365110X61002989
4. Kato M., Kubo T. Solid State Reaction in the System of Y2O3 — TiO2. J. Chem. Soc. Jpn. 1967. 70(6): 840-843.
https://doi.org/10.1246/nikkashi1898.70.6_840
5. Negas T., Roth R.S., Parker H.S., Minor D. Subsolidus Phase Relations in the BaTiO3 — TiO2 System. J. Solid Stale Chem. 1981, no 9: 287-307.
6. Makovec D., Kolar D. Internal Oxidation of Ce3+ — BaTiO3 Solid Solutions. J. Am. Ceram. Soc. 1997, 80 [1]. P. 45-52.
https://doi.org/10.1111/j.1151-2916.1997.tb02789.x
7. Borodin Ju.S., Gricjuk A.V., Dorozhenko A.N., Demidenko D.V., Kondratenko V.G. Ustrojstvo lokal'nogo predpuskovogo podogreva korennyh podshipnikov kolenchatogo vala dizelja na osnove pozistornoj keramiki. Dvigateli vnutrennego sgoranija. 2003, no 1-2: 15-19 [in Russian].
8. Grycjuk O.V., Demydenko D.V., Bilous O.G., Stupin Ju.D. Dosvid zastosuvannja pozystornoi' keramiky v prystrojah lokal'nogo peredpuskovogo pidigrivu vuzliv i system avtotraktornogo dyzelja. Aviacijno-kosmichna tehnika i tehnologija. 2006, no 7(33): 109-113 [in Ukrainian].
9. Gricjuk A.V., Kondratenko V.G., Shherbakov G.A. Sovershenstvovanie konstrukcii toplivnoj sistemy avtotraktornogo dizelja dlja uluchshenija ejo raboty v uslovijah zimnej jekspluatacii. Dvigateli vnutrennego sgoranija. 2006, no 1: 109-114 [in Russian].