The ferroelectric phase transition temperature was significantly raised by 5 K in partially deuterated K H2 P O4 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 P31 NMR measurements of the chemical shift tensor revealed phosphorous displacement in the hydrogen-bonded direction and the P O4 tetrahedral distortion. Increase of the phase transition temperature can be closely related to the structural modification involving the hydrogen-bond geometry.
Bibliographical noteFunding Information:
This work was supported by the User Program of PEFP (Proton Engineering Frontier Project), as a part of the 21C Frontier R&D Program supported by the Ministry of Science and Technology. The measurements at the Korean Basic Science Institute (KBSI) are acknowledged.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)