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NMR and impedance study of H+-ion irradiated TlH2PO4

Published online by Cambridge University Press:  01 February 2011

Se Hun Kim ,
Kyu Won Lee ,
Jae Won Jang ,
Cheol Eui Lee  and
S. J. Noh
Se Hun Kim
Affiliation:
Department of Physics, Korea University, Seoul 136–713, Korea
Kyu Won Lee
Affiliation:
Department of Physics, Korea University, Seoul 136–713, Korea
Jae Won Jang
Affiliation:
Department of Physics, Korea University, Seoul 136–713, Korea
Cheol Eui Lee
Affiliation:
Department of Physics, Korea University, Seoul 136–713, Korea
S. J. Noh
Affiliation:
Department of Applied Physics, Dankook University, Seoul 140–714, Korea
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Abstract

The H+-ion treatment effect on TlH2PO4, a KH2PO4 (KDP)-type ferroelectrics, was studied by nuclear magnetic resonance (NMR) and AC dielectric measurements. A sample of TlH2PO4 was irradiated by 1-MeV H+ ion beams to a dose of 1015 ions/cm2. The irradiation changed the hydrogen-bond geometry, presumably affecting the order-disorder proton dynamics. The deformation of the PO4 tetrahedra was identified by the isotropic chemical shift and the full width at half maximum (FWHM) of the high-resolution 31P NMR spectra. A prominent decrease in the dielectric constant was also observed after the irradiation. The macroscopic and microscopic changes due to the irradiation are discussed in the light of the proton dynamics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K3.4
Copyright
Copyright © Materials Research Society 2005

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References

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