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Published on: February 23, 2016
Proton dynamics in Rb(3)H(SO(4))(2) doped with Mn(2+) studied by EPR and impedance spectroscopy.
Electron paramagnetic resonance (EPR) studies reveal changes in Rb(3)H(SO(4))(2) crystals, including altered spin parameters and increased conductivity after heating above the superprotonic phase transition.
Area of Science:
- Solid State Physics
- Materials Science
- Crystallography
Background:
- Rubidium trihydrogen sulfate (Rb(3)H(SO(4))(2)) is a crystal exhibiting a superprotonic phase transition.
- Understanding the behavior of impurities within such crystals is crucial for their applications.
Purpose of the Study:
- To investigate the temperature dependence of spin Hamiltonian parameters and linewidth in Mn(2+)-doped Rb(3)H(SO(4))(2) crystals.
- To determine the coordination and zero-field-splitting tensor of Mn(2+) impurities.
- To study the effect of the superprotonic phase transition on crystal properties and electric conductivity.
Main Methods:
- X-band continuous-wave electron paramagnetic resonance (EPR) spectroscopy.
- Temperature-dependent EPR measurements from 20-450 K.
- Electric conductivity measurements.
Main Results:
- Determined temperature dependence of linewidth and spin Hamiltonian parameters.
- Established direction cosines of the zero-field-splitting tensor and Mn(2+) coordination.
- Observed irreversible changes in EPR spectra to pseudo-powder spectra above the phase transition.
- Noted a significant increase (approx. one order of magnitude) in electric conductivity for Mn(2+)-doped crystals after heating.
Conclusions:
- The study elucidates the impact of temperature and phase transitions on the EPR spectra and physical properties of Rb(3)H(SO(4))(2) crystals.
- Mn(2+) doping influences the crystal's conductivity, particularly after thermal treatment.
- EPR is a sensitive tool for probing structural and electronic changes in functional materials.
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