Growth and Domain Structure of TGS Crystals Doped with Various Amino Acids

Abstract

Single crystals of triglycine sulfate (TGS) doped with various L-form amino acids have been prepared. Doping effects on the crystal morphology and the ferroelectric domain structure, and the generation of internal bias field E _b were investigated. For crystals grown from solutions with L-valine, L-leucine, and L-isoleucine, both the morphology and the domain structures were resemble to pure TGS and the generation of E _b was not realized. Doping of L-threonine, L-cysteine, L-asparagine, L-aspartic acid, and L-methionine caused obvious effect on the morphology. The effect on the domain structure and the generation of E _b in these crystals were considerably different from those in L-alanine doped crystals.

Keywords:

• TGS
• doping of amino acids
• crystal growth
• morphology
• domain
• internal bias field

Notes

*Formula weight.

**The three letter abbreviation.

***The number in the parenthesis is the mol % of solution.

*The variation in each sector was 20–30 %.