Electronic studies of KH(2)PO(4)
MetadataShow full item record
The results of electrocaloric studies of the electrical equation of state of KH(2)PO(4) in the temperature region within 1 K of the ferroelectric transition are reported. Chief emphasis is given to determination of the spontaneous polarization. A discontinuous polarization jump of 1.87 ± 0.09 C/cm² is found at T(c). Several tests of the validity of the phenomenological theory of ferroelectricity, including a noncalorimetric determination of the heat capacity, are made. It is shown that the phenomenological theory provides a good and consistent description of the thermodynamic behavior of PH(2)PO(4). No major discrepancies which might be linked to behavior near a phase transition are found. Any possible discrepancies are minor and confined to the temperature region T(c) - T < 0.1 K. It is shown that a term proportional to P(8) dominates the behavior. Evidence is presented that a portion of the calorimetric anomaly near T(c) is not directly related to the temperature dependence of the polarization.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Ellison, K.H.; McNelley, T.R.; Fox, A.G. (1993);The elevated temperature deformation behavior of an Al-2. 0 wt pct Li alloy in the temperature range 300 °C to 500 °C was studied using constant extension-rate tension testing and constant true-stress creep testing under ...
Goodson, Earl F., Sr. (Monterey, California. Naval Postgraduate School, 1989-12);The effect of stress and temperature on the creep behavior of an Al-2.0wt%.Li alloy was investigated in the temperature range from 300 to 5000C. This temperature interval corresponds to a solid solution of Li in Al. ...
Electron paramagnetic resonance study of copper halide tetrazole complexes and the free radicals in irradiated strontium acetate hemihydrate Gisch, Robert Gary (Monterey, California. U.S. Naval Postgraduate School, 1969-06);An EPR study of copper halide tetrazole complexes and x-irradiated strontium acetate hemihydrate has been made. The powder spectra of some of the tetrazole complexes exhibited temperature dependent narrowing and broadening. ...