Structural and proton-dynamical effects in a proton-irradiated KH{sub 2}PO{sub 4} single crystal

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788040

Kim, S H; Oh, B H; Lee, K W; Lee, Cheol Eui; Hong, K S ^[1]

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1. Department of Physics and Institute for Nano Science, Korea University, Seoul 136-713 (Korea, Republic of)

A KH{sub 2}PO{sub 4} (KDP) crystal, irradiated by a 1 MeV hydrogen ion beam to a dose of 10{sup 15} ions/cm{sup 2}, was studied by means of x-ray diffraction (XRD), {sup 1}H nuclear magnetic resonance (NMR), and dielectric constant measurements. The XRD pattern for the a-cut KDP crystal revealed a decrease in the lattice constant along the a axis after the proton irradiation. According to the {sup 1}H NMR spin-lattice relaxation rate measurements, the proton irradiation gave rise to reduction in the activation energy in the paraelectric phase, from 0.42 to 0.28 eV, in agreement with the temperature dependent second moment measurements indicating the proton motion is more activated after the proton irradiation. Besides, analysis of the temperature-dependent dielectric constants using a mean-field approximation revealed a change in the hydrogen bond induced by the proton irradiation.

• OSTI ID: 20788040
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 13; Other Information: DOI: 10.1103/PhysRevB.73.134114; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
APPROXIMATIONS
EV RANGE
FERROELECTRIC MATERIALS
HYDROGEN
HYDROGEN 1
HYDROGEN COMPOUNDS
HYDROGEN IONS
IRRADIATION
LATTICE PARAMETERS
MEAN-FIELD THEORY
MEV RANGE
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
PERMITTIVITY
PHYSICAL RADIATION EFFECTS
POTASSIUM PHOSPHATES
PROTONS
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION