Accession Number : AD0672281

Title :   RESEARCH ON DEFECT CONTROLLED ELECTRICAL PROPERTIES OF RUTILE.

Descriptive Note : Final technical documentary rept. 25 Nov 65-25 Nov 67,

Corporate Author : MARQUETTE UNIV MILWAUKEE WIS

Personal Author(s) : Hirthe,Walter M. ; Blumenthal,Robert N.

Report Date : APR 1968

Pagination or Media Count : 58

Abstract : The electrical conductivity of single crystals of rutile (TiO2) was measured in the 'c' and 'a' directions over a temperature range 1000 degrees -1500 degrees C and from 1 to 10 the the -15th power atm of oxygen. The non-stoichiometric defect structure was rationalized on the basis of quasi-free electrons, both triply and quadruply ionized titanium interstitials, and acceptor impurities. A model based on the electrode blocking of titanium interstitials is proposed to explain the electrical transients observed below 1000 degrees C. An electron mobility of about 0.1 cm sq/volt-sec has been calculated by combining thermogravimetric and conductivity data above 1100 degrees C. A calculation of the cohesive energy of TiO2 using the Born-Mayer model indicates that the bonding in rutile is predominantly ionic. (Author)

Descriptors :   (*SEMICONDUCTORS, RUTILE), (*RUTILE, ELECTRICAL PROPERTIES), CRYSTAL DEFECTS, IMPURITIES, TRANSPORT PROPERTIES, BAND THEORY OF SOLIDS, ENTHALPY, ELECTRICAL CONDUCTIVITY, TRANSIENTS, MOLECULAR ASSOCIATION, SINGLE CRYSTALS, HIGH TEMPERATURE

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE