Appearance of internal bias field in ferroelectric growth process

Abstract

The growth regularities of the internal bias field E_b formation have been investigated in pure triglycine sulphate crystals, as well as in crystals doped with chromium or α-alanine. All crystals were grown in the ferrophase from the seed of the pivot form oriented by its axis along the non-polar crystal axis Z. It was found that the bias field had different signs in the samples lying on opposite sides of the seed along the polar axis Y in the crystals with chromium impurity and pure crystals and the same sign in α-alanine doped ones. The probable mechanism of E_b field formation is suggested for both cases.

Key Words:

• TGS
• bias fields
• unipolarity
• doping