Abstract
A modified alanine doped triglycine sulphate (ATGS) crystal has been grown with partial substitution of H2SO4 with H3PO4. Growth of the ATGSP crystal from a unipolar ATGS seed in the temperature range 30-40°C gives a unipolar bulk crystal with lower permittivity (εr ∼ 30) and higher pyroelectric coefficient (6.5·10-4 c/k.m2) than pure TGS. In the doping range used, the higher pyroelectric coefficient is traced to a significantly larger spontaneous polarization Ps (∼5 μc/cm2 at room temperature). Tangent δ is below 0.01 over the whole frequency range from 100 Hz to 100 KHz.
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