Article

Optical properties of BiFeO3 ceramics in the frequency range 0.3–30.0 THz

Physics of the Solid State (impact factor: 0.71). 04/2012; 52(4):734-743. DOI:10.1134/S1063783410040104 pp.734-743

ABSTRACT Reflection and transmission infrared spectra of BiFeO3 ceramic samples have been measured using submillimeter spectroscopy (on a backward-wave tube spectrometer) and Fourier-transform
infrared spectroscopy in the frequency range from 5 to 1000 cm−1 at temperatures in the range from 10 to 500 K. New resonant modes (probably, magnetic in nature) with the eigenfrequencies
decreasing with an increase in the temperature have been recorded in the range 10–30 cm−1 by IR spectroscopy for the first time. An additional absorption with a fairly large dielectric contribution has been revealed
in the range 30–60 cm−1. It has been demonstrated that the corresponding oscillators couple with both the lowest frequency phonon mode and the magnetic
subsystem.

0 0
 · 
0 Bookmarks
 · 
34 Views
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

500 K. New resonant modes
 
additional absorption
 
backward-wave tube spectrometer
 
BiFeO3 ceramic samples
 
corresponding oscillators couple
 
frequency range
 
IR spectroscopy
 
large dielectric contribution
 
lowest frequency phonon mode
 
submillimeter spectroscopy
 
transmission infrared spectra