Accession Number : AD0669631

Title :   DELAYED COINCIDENCE-MOSSBAUER STUDIES OF SOLID STATE PHENOMENA.

Descriptive Note : Final rept. 1 Apr 66-30 Apr 68,

Corporate Author : BOSTON UNIV MASS

Personal Author(s) : Hoy,Gilbert R.

Report Date : 17 MAY 1968

Pagination or Media Count : 7

Abstract : The research group has developed a suitable system for performing delayed-coincidence Mossbauer studies of solid state phenomena. The essential feature of effective electric field gradients and magnetic fields in ferrous compounds has been the development of techniques for obtaining the values of the effective fields at iron nuclei in solids from the corresponding Mossbauer spectrum. It was shown that a measurement of the discontinuity in the electric field gradient at the iron nuclei as a function of temperature is closely related to the ferroelectric transition. The effective field parameters at Fe57 nuclei in the cubic normal spinel FeCr2S4 have been investigated in the temperature range from 60 degrees K to 298 degrees K, using the Mossbauer effect. Single crystals of sodium nitroprusside were grown from solution and cut in various orientations with respect to the crystalline axes. (Author)

Descriptors :   (*MOSSBAUER EFFECT, IRON COMPOUNDS), (*FERROELECTRIC CRYSTALS, TRANSITION TEMPERATURE), CRYSTAL GROWTH, SINGLE CRYSTALS, ANISOTROPY, ELECTRIC FIELDS, MAGNETIC FIELDS, CRYOGENICS, LOW TEMPERATURE, SPINEL, CHROMIUM COMPOUNDS, SULFIDES, SODIUM COMPOUNDS

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE