Pyroelectric properties of a new alanine- and phosphate-substituted triglycine sulphate (ATGSP) crystal

Abstract

Phosphorous- and alanine-doped triglycine sulphate (ATGSP) crystals have been grown with partial substitution of H 2SO 4 with H 3PO 4. ATGSP crystals have lower permittivity ( ϵ r ≈ 30) and higher pyroelectric coefficient (6.5 × 10 −4 C/K m 2) compared to those of pure TGS. In the doping range used, the higher pyroelectric coefficient is traced to a significantly larger spontaneous polarization P s (≈ 5 μC/cm 2 at room temperature). Tangent δ is below 0.01 over the whole frequency range from 100 Hz to 100 kHz.