Polytypes of monoclinic TlInS2

Dielectric properties and phase transitions in crystals of TlInS x Se2 − x solid solutions

“…ferences between the PT temperatures in crystals of this family reported by different authors could possibly be attributed to these layered crystals being susceptible to polytypism [10,11]. In TlInS 2 crystals, one observed in some cases pure polytypes with cell parameters c 1 ≈ 15 Å, c 2 ≈ 60 Å, and c 3 ≈ 120 Å, with the temperatures of the PT from the incommensurate to commensurate phase being, respectively, T c1 ≈ 204 K, T c2 ≈ 215 K and T c3 ≈ 201 K. Sometimes a mixture of polytypes can be formed in the crystal; in this case, several anomalies will be observed in the PT region.…”

Radiation resistance of photodiodes based on indium monoselenides under γ-irradiation

“…The role of photosensitivity centres is played by chalcogenide vacancies in these semiconductors. Indeed, defects induced by c-irradiation of GaSe contain selenium vacancies V Se as explained by the specific features of the GaSe layered structure, which provides for weak coupling of selenium in the lattice [9].…”

“…Only a few studies have been conducted on the radiation resistance of layered III-VI semiconductor crystals and those that have are restricted to c-irradiation [7][8][9][10]. Similarly, only a few publications have examined the influence of c-irradiation on the properties of InSe-based photodiodes [3,4,11].…”

Ferroelectric phases in the polytypes of TlInS2 ternary compound

“…The polytypes differ one from another by the quantity of such packages, i.e. by elementary cell parameter c: c, 2c, 3c, 4c… It has been shown, that changing of packages quantity, included in an elementary cell, substantially influences the temperature dependences of the real part of the TlInS 2 crystals dielectric constant ε [8]. It had been established that polytypes of TlInS 2 crystals differ in their acoustic properties also.…”

“…As a result the layered packages, that are perpendicular to the C axes, can be easily moved in relation to each other. One packages structure is characterized by a parameter с ≈ 15 Å (C-polytype) [8]. The polytypes differ one from another by the quantity of such packages, i.e.…”