Accession Number : AD0608624

Title :   SPIN-LATTICE RELAXATION OF TI(+3) IONS IN CORUNDUM: TEMPERATURE DEPENDENCE AT 9 GC FOR THETA = 0.

Descriptive Note : Scientific rept. no. 4,

Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA

Personal Author(s) : Feldman,D. W. ; Burnham,D. C. ; Castle,J. G. ,Jr.

Report Date : MAY 1964

Pagination or Media Count : 20

Abstract : Spin relaxation was measured at 9 Gc for several samples of titanium doped Al2O3, over the temperature range from 1.3K to 14K. The spin-lattice relaxation time, T sub1, for the portion of the paramagnetic resonance line at theta = 0 havine gsub// = 1.05 to 1.10, has values varying from 5 sec to 5 x 10 to the minus 9th power sec according to the expression 1/T sub 1 = B T + C T to the 9th power + D exp(- delta/T), where B = 0.13/sec K, C = 7 (10-4)/sec K to the minus 9th power, D = 2.5 (10to the 10th power)/sec, and delta = 52 = 1K. These results are discussed in terms of spin-lattice interactions for individual Ti(+3) ions. In particular, the value of delta is assigned to the spin-orbit splitting between the lowest pair of electronic doublets for the configuration which may be approximately described as 3d. Effects of covalency are mentioned. (Author)

Descriptors :   (*TITANIUM, CORUNDUM), (*CORUNDUM, PARAMAGNETIC RESONANCE), (*PARAMAGNETIC RESONANCE, RELAXATION TIME), NUCLEAR SPINS, IMPURITIES, ALUMINUM COMPOUNDS, OXIDES, CRYSTAL LATTICES, TEMPERATURE, ELECTRONS, ATOMIC ORBITALS, MICROWAVE SPECTROSCOPY, RESONANCE ABSORPTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE