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Title: TEMPERATURE DEPENDENCE OF THE NUCLEAR QUADRUPOLE SPECTRUM OF Nb$sup 93$ IN FERRO-ELECTRIC KNbO$sub 3$

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)

Authors:
Publication Date:
Research Org.:
Univ. of California, Riverside
OSTI Identifier:
4125132
NSA Number:
NSA-15-006844
Resource Type:
Journal Article
Journal Name:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Additional Journal Information:
Journal Volume: Vol: 121; Other Information: Orig. Receipt Date: 31-DEC-61
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
PHYSICS; CRYSTALS; ELECTRIC FIELDS; ELECTRIC MOMENTS; LATTICES; MEASURED VALUES; NIOBIUM 93; NIOBIUM OXIDES; NUCLEI; POTASSIUM OXIDES; QUADRUPOLES; SPECTRA; TEMPERATURE; VARIATIONS

Citation Formats

Hewitt, R R. TEMPERATURE DEPENDENCE OF THE NUCLEAR QUADRUPOLE SPECTRUM OF Nb$sup 93$ IN FERRO-ELECTRIC KNbO$sub 3$. Country unknown/Code not available: N. p., 1961. Web. doi:10.1103/PhysRev.121.45.
Hewitt, R R. TEMPERATURE DEPENDENCE OF THE NUCLEAR QUADRUPOLE SPECTRUM OF Nb$sup 93$ IN FERRO-ELECTRIC KNbO$sub 3$. Country unknown/Code not available. doi:10.1103/PhysRev.121.45.
Hewitt, R R. Sun . "TEMPERATURE DEPENDENCE OF THE NUCLEAR QUADRUPOLE SPECTRUM OF Nb$sup 93$ IN FERRO-ELECTRIC KNbO$sub 3$". Country unknown/Code not available. doi:10.1103/PhysRev.121.45.
@article{osti_4125132,
title = {TEMPERATURE DEPENDENCE OF THE NUCLEAR QUADRUPOLE SPECTRUM OF Nb$sup 93$ IN FERRO-ELECTRIC KNbO$sub 3$},
author = {Hewitt, R R},
abstractNote = {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)},
doi = {10.1103/PhysRev.121.45},
journal = {Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D},
number = ,
volume = Vol: 121,
place = {Country unknown/Code not available},
year = {1961},
month = {1}
}