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Author Hewitt, R. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ CRYSTALS ♦ ELECTRIC FIELDS ♦ ELECTRIC MOMENTS ♦ LATTICES ♦ MEASURED VALUES ♦ NIOBIUM 93 ♦ NIOBIUM OXIDES ♦ NUCLEI ♦ POTASSIUM OXIDES ♦ QUADRUPOLES ♦ SPECTRA ♦ TEMPERATURE ♦ VARIATIONS
Abstract The nuclear electric quadrupole interaction of Nb/sup 93/ in ferroelectric KNbO/sub 3/ was measured as a function of temperature in the tetragonal, orthorhombic. and rhombohedral phases. The values of (1/ nu )(d nu / d UPSILON ) for these three phases are approximately -10/sup -3/, -lO/sup -3/, and -10/sup -4/ per degree cen tigrade, respectively. In the tetragonal phase at 220 deg C, e/sup 2/qQ/h was measured as 24 Mc/sec and the asymmetry parameter n is zero. An ionic calculation of field gradients in the tetragonal phase was made including point charge and induced dipole contributions. The results give the Sternheimer antishielding factor (l- gamma ,) as 15 in good agreement with its estimated value of +16. The temperature dependence of the electric field gradient at the Nb/sup 93/ site as calculated from the ionic model is in agreement with the measured temperature dependence in the tetragonal phase. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1961-01-01
Publisher Department Univ. of California, Riverside
Journal Physical Review
Volume Number 121
Organization Univ. of California, Riverside


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