title: Phase transitions and incommensurability in the layered semiconductor TlInS2--an NMR study.
abstract: We report on the first NMR study of powder and single crystal samples of thallium indium sulfide, TlInS(2). The crystal under study is a pure single-layer TlInS(2) polytype. Our findings show that transformation from the high temperature paraelectric phase to the low temperature ferroelectric phase occurs via an incommensurate phase that exists in the temperature range from T(c) = 192 K to T(i) = 205 K. On approaching the phase transition at T(i) from above, the crystal exhibits a soft mode behavior. A discrepancy in the literature data on the phase transitions in TlInS(2) is discussed and ascribed to polytypism of the TlInS(2) crystals.
authors.affiliation: Department of Physics, Ben-Gurion University of the Negev, PO Box 653, Be'er Sheva 84105, Israel. pan@bgu.ac.il
authors.forename: A M
authors.initials: AM
authors.lastname: Panich
authors.forename: D
authors.initials: D
authors.lastname: Mogilyansky
authors.forename: R M
authors.initials: RM
authors.lastname: Sardarly
mesh_terms: D018360:Crystallography, X-Ray; D007204:Indium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D044367:Phase Transition; D012666:Semiconductors; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D013793:Thallium / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D009942:Organometallic Compounds; D013440:Sulfides; D007204:Indium; D013793:Thallium