“Film Synthesis of Cerium and Bismuth Oxides’ Solid Solutions by Ions and Plasma Activated Deposition” Doctoral Thesis

Author, institution: Vytautas Adomonis, Kaunas University of Technology

Science area, field: Physical sciences, Physics

The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas).

Scientific Supervisor: Prof., Dr. Habil. Julius DUDONIS (Kaunas University of Technology, Physical Sciences, Physics 02P).

Dissertation defence board of Physics Science Field:
Prof., Dr. Diana ADLIENĖ (Kaunas University of Technology, Physical Sciences, Physics 02P); – chairman
Prof., Dr. Habil. Arvaidas GALDIKAS (Kaunas University of Technology, Physical Sciences, Physics 02P);
Prof., Dr. Liutauras MARCINAUSKAS (Kaunas University of Technology, Physical Sciences, Physics 02P);
Assoc. Prof. Dr. Saulius MICKEVIČIUS (Vytautas Magnus University, Physical Sciences, Physics 02P);
Assoc. Prof. Dr. Bonifacas VENGALIS (Center for Physical Sciences and Technology, Physical Sciences, Physics 02P).

Official Opponents:
Dr. Šarūnas MEŠKINIS (Kaunas University of Technology, Physical Sciences, Physics 02P);
Prof., Dr. Habil. Feliksas Antanas ORLIUKAS (Vilnius University,Physical Sciences, Physics 02P).

Annotation:

In this work bismuth and cerium oxide doped with additives coating synthesis was investigated. Cerium oxide is used in optical and electronic devices, temperature and humidity sensors and dosimeters.
Bismuth oxide is interesting in that its allotropic varieties has many different properties: oxygen ion conductivity (1S/m) at low temperatures, piezoelectric and semiconducting properties. Bismuth oxide has six allotropic varieties: α phase (monoclinic), b phase (tetragonal), g fazė (body centered cubic), d phase (face centered cubic), e fazė (orthorombic), w fazė (triclinic). Cerium and bismuth oxides doped with additives are used for practical purposes.
This work was aimed to stabilize cerium and bismuth oxide allotropic varieties with additives. Coatings were formed using reactive magnetron deposition method and the reactive ions activated evaporation method. Coatings were formed layer by layer and simultaneous method. The samples were annealed to activate additives and to mix the film layers.
Cerium oxide coating, stabilized with additives (Gd) were formed by reactive magnetron layer by layer deposition method. Bismuth oxide coating was stabilized with additives (Gd and Mo) by reactive magnetron layer by layer deposition method. As well as bismuth oxide coatings was stabilized with lead by simultaneous reactive ions activated evaporation method. X ray diffraction spectroscopy was performed to all samples. It was also made the surface morphology of the SEM image and the elemental composition, calculated band gap width and film thickness.