Abstract
Single crystals of phosphoric-acid-doped triglycine sulfate (TGSP) were grown from solutions with various concentrations of H3PO4. The concentration of dopant in the crystal and the P–E hysteresis loop have been investigated. The concentration in the crystal is much lower than that in solution. The incorporation of H3PO4 molecule is highly inhomogeneous in the crystal and depends on the crystal growth sector. The doping generates no internal bias field and has no influence on the spontaneous polarization. Since the incorporated H3PO4 molecules act as obstacles to polarization switching, doping results in an the increase in coercive field E c. There is a distinct correlation between the intensity of E c and the concentration of H3PO4 in the crystal.
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