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Significant increase of the ferroelectric phase transition temperature in partially deuterated KH2PO4 by proton irradiation

Authors
Lee, Kyu WonOh, B. H.Kweon, J. J.Lee, Cheol Eui
Issue Date
17-Sep-2007
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.91, no.12
Indexed
SCIE
SCOPUS
Journal Title
APPLIED PHYSICS LETTERS
Volume
91
Number
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/125707
DOI
10.1063/1.2784178
ISSN
0003-6951
Abstract
The ferroelectric phase transition temperature was significantly raised by 5 K in partially deuterated KH2PO4 irradiated by a proton beam. Increase in the hydrogen bond length was indicated by the dielectric constant analysis. Deuteron nuclear magnetic resonance (NMR) measurements of the electric field gradient tensor showed atomic displacement after the proton irradiation, and P-31 NMR measurements of the chemical shift tensor revealed phosphorous displacement in the hydrogen-bonded direction and the PO4 tetrahedral distortion. Increase of the phase transition temperature can be closely related to the structural modification involving the hydrogen-bond geometry.
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