Electrical Properties of Transition Metal Oxides Up to 1800 C.
Final rept. 1 Aug 64-30 Apr 70,
TECHNION - ISRAEL INST OF TECH HAIFA
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Properties of atomic defects and of charge carriers in the following materials were determined MnO, FeO, CoO, and NiO. Most of the measurements were made on undoped material under high temperature equilibrium conditions with the lower limit of temperature being 900C, and the upper limit being 1500C or even 1700C in the case of MnO. The oxygen pressure extended from pure oxygen to 10 to the minus 20th power atm of oxygen. Properties measured or calculated from the measurements were deviation from stoichiometry, conductivity, thermopower, Hall mobility and drift mobility of electrons and holes, concentrations of ionized and non-ionized defects. Additional results include parts of the phase diagram of the above compounds. For CoO measurements were also made on chemically doped materials. In the case of FeO and CoO the author has made measurements of electrical properties in the vicinity of room temperature and down to liquid air temperature. In NiO the author has measured the photoconductive response in the near infrared, the visible and the ultraviolet. Materials used were single crystals and polycrystals, depending on availability and on the experimental conditions. Single crystals of NiO and FeO were grown in this laboratory by an epitaxial method. Author
- Solid State Physics