Anomalous shift of the absorption edge in ferroelectric BaTiO(3), under an electric field.
A study was made of the shift of the absorption edge in BaTiO(3) caused by an applied electric field near the phase transition from the tetragonal phase to the cubic one. The absorption edge shifted to shorter wavelengths is independent of the direction of the field. This shift was measured as a function of temperature and field strength and shows a sharp maximum at the Curie temperature theta, a linear field dependence below theta, and a quadratic field dependence above theta.
Fridkin
V M
VM
Institute of Crystallography of theU.S.S.R. Academy of Sciences, Moscow, USSR.
Verkhovskaya
K A
KA