Internal bias field in glycine phosphite crystal

The distributions of internal bias field E-b have been investigated under the carbon-powder pattern and mercury electrode techniques in GPI ferroelectric crystals. Polarity and intensity of Eb are distributed depending on crystal growth sectors. Crystal symmetry 2/m is observed obviously in the distribution of E-b. The polarities of E-b are head-to-head manner in those growth sectors where a surface is growing parallel to the crystallographic alpha-axis and tail-to-tail manner in the other growth sectors in the crystal. The maximum intensity of E-b is found in the sectors {010} where the growing surfaces are perpendicular to the ferroelectric b-axis.