Edwin A. Uehling

Absence of a Linewidth Transition for the Protons in KH2PO4‐Type Crystals

The linewidth and shape of the proton resonance in KH2PO4 is described, and the nonexistence of a linewidth transition in the range of 77° to 300°K is discussed. The calculated and experimental values of the second moment are about 1.5 G2.

Nuclear Magnetic Resonance of Arsenic and Antimony in Liquid AsF5 and SbCl5

Nuclear magnetic resonances of arsenic and antimony were observed in liquid AsF/sub 5/ and SbCl/sub 5/ at room temperature. The linewidth of the As/ sup 75/ NMR was approximately l5 gauss with no evidence of structure in the resonance. The NMR of both Sb/sup 121/ and Sb/sub 123/ were easily observed. The observed linewidth for Sb/sup 121/ resonance was approximately the same as As/ sup 75/. Searches were made at 11 Mc for the Sb/sup 121/ NMR in solid SbCl/sub 5/ at 0 deg C and also for pnre quadrupole reconances at 77 deg K with negative results in both cases. The frequency range covered was 6 to 190 Mc. (P.C.H.)

Ferroelectric Research at the University of Washington During the Period 1955-70

Major accomplishments in ferroelectric research during the period 1955-70 stimulated in whole or in part by work initiated at the UW include: (a) the first observation of a deuteron magnetic resonance in a hydrogen-bonded solid, thus opening up a new technique for studying hydrogen bond dynamics; (b) theoretical and experimental exploitation of a model of hydrogen bond dynamics which takes account of both interbond and intrabond motion; (c) a satisfactory resolution of major theoretical problems associated with phase changes in hydrogen bonded ferroelectrics; and (d) reinterpretation of phase transition phenomena through the successful application of experimental techniques different from nuclear magnetic resonance such as electrical conductivity, domain dynamics, and velocity of sound measurements.

Simultaneous phenomenon of ferro- and antiferroelectricity in KH2P04 type crystals

Abstract It is shown that the transition in KDP type crystals can be described as one which possesses the dual characteristics of both ferro- and antiferroelectric properties, depending on the direction of observation. The transverse susceptibility is calculated based on a well known model for KDP, and compared with experiment. The results are in excellent agreement with the data and provide further evidence that the numerical value for the tunnelling integral is much larger in KH2PO4 than in KH2ASO4.