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:

1968-04-01

Pagination or Media Count:

58.0

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 sqvolt-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