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Proceedings Paper

Electron plasma parameter ferroelectric TGS
Author(s): Nadezhda P. Netesova
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Paper Abstract

The crystal is represented in the form of individual molecule sublattices. Within oscillation electronic model, a superconducting phase transition in an ABCD crystal is possible when the square plasma energy Φ2 of the resulting molecular sublattices is equal (or larger) to the square plasma energy of the initial crystal.
Within the electron oscillation model, the parameters of the valence electron TGS crystal interaction — triglycine sulfate (NH2CH2COOH)3H2S04 were considered. For TGS, the parameters for phase transition temperatures at T1 <10 K, T2 = 110 K, T3 = 322.05 K were calculated.

The results of calculations using the electron plasma model for TGS: M is the molecular mass, ρ is the mass density, s is the number of valence electrons, G is the glycine molecule NH2CH2COOH, Φ2 = 830 ● ρ ● s / M ─ square plasma energy in eV2; q, v = z●β, β are interaction parameters, z is the number of formula units,
q = v●Φ2 (TGS)/ΣΦ2─1, Φ2 (TGS) ─ square plasma energy for TGS, ΣΦ2 is the total square energy of the resulting molecules when the valence bonds are broken.

Φ2 (TGS) = 830●1.69●122 / 323.3 = 529.32075471,
2●Φ2 (O) = 2●354.9456 = 709.89.
0.5●Φ2 (S) = 0.5●321.48069606 = 160.74034803,
Φ2 (GH) = 543.55343762, 0.5●Φ2 (G) = 533.02650859/2 = 266.513254295
Φ2 (GH) + 0.5●Φ2 (G) = 543.55343762 + 266.513254295 = 810.066691915

Energy balance criterion
Φ2 (TGS) = 529.32075471 < Φ2 (GH) + 0.5●Φ2 (G) = 810.066691915,
Φ2 (TGS) = 529.32075471 < 2●Φ2 (O) = 709.8912,
Φ2 (TGS) = 529.32075471 > 0.5●Φ2 (S) = 0.5●321.48069606 = 160.74034803.

ΣΦ2 = 709.8912 + 810.066691915 + 160.74034803 = 1680.698239945
q = 2●β●529.32075471 / 1680.698239945 ─ 1
From the equation Tc = 40.05687 q2 ─ 234.44056 q + 191.51842 we calculate the parameters q, β for several temperatures: 322.15, 110, 6, 2.872413475, 0.

It can be assumed that the phase transition in TGS crystal at T2 = 110 K is antiferroelectric. The coexistence or phase separation of the antiferroelectric and superconducting phases is possible. At T <150 K, the TGS crystal undergoes phase separation, leading to crystal destruction. Therefore, it is necessary to use a TGS crystal for detectors in the temperature range up to 200 K.

Paper Details

Date Published: 2 March 2020
PDF: 7 pages
Proc. SPIE 11274, Physics and Simulation of Optoelectronic Devices XXVIII, 112741O (2 March 2020); doi: 10.1117/12.2539257
Show Author Affiliations
Nadezhda P. Netesova, M.V. Lomonosov Moscow State Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 11274:
Physics and Simulation of Optoelectronic Devices XXVIII
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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