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Single Crystals Of TGS and ATGS Groups
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ATGSTGS
Water-soluble Triglycine Sulfate crystals have technological importance for room-temperature infrared detectors, earth exploration, radiation monitoring and astronomical telescopes. TGS is the best material applied as a sensitive element in pyroelectric sensors due to its high pyroelectric coefficient, reasonably low dielectric constant, and the best quality factor. Pyroelectric sensors based on TGS are uniformly sensitive to radiation in the wavelength range from ultraviolet to far infrared and do not require cryogen cooling for operation. The use of deuterated DTGS crystals allows to extend temperature range of sensing due to their higher Curie temperature.
Triglycine Sulphate TGS (NH2CH2COOH)3 H2SO4
Deuterated Triglycine Sulphate DTGS (ND2CD2COOD)3 D2SO4
L-α-Alanine Doped TGS ATGS L-α-Ala (NH2CH2COOH)3 H2SO4
L-α-Alanine Doped DTGS ADTGS L-α-Ala (ND2CD2COOD)3 D2SO4
Doping with La -Alanine significantly improves and orders domain structure and turns the material to a hard ferroelectric.
MAIN PROPERTIES:

Material TGS DTGS ATGS ADTG
Curie temperature Tc, °C 49 57 - 59 49 56 - 58
Dielectric constant ε22v at T=25°C (f=1 kHz, Ebias =5 kV/cm) 20 - 40 17 - 19 20 - 40 17-19
Dielectric loss tg δ at T=25°C (f=1 kHz, Ebias = 5 kV/cm) (3 - 4) x 10-3 (2 - 3) x 10-3 (3 - 4) x 10-3 (2 - 3) x 10-3
Internal bias E0 (T=25°C), V/cm < 25 < 25 1000 - 1500 900
Pyroelectric constant γ2(dPS /dT), Goul x cm-2 x K-1 (3 - 4) x 10-8 (2.7 - 3) x 10-8 (2 - 4) x 10-8 3 x 10-8
Figures of Merit M1 at T=25°C (dPS/dT) x ε22-1 11 - 12 15 - 16 11 - 12 15 - 16
L-α-Alanine concentration in solution, % wt. - - 10, 20, 30 10, 20, 30

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