Metastable conduction states inMo2S3: Pulse conductivity and th

Abstract

Mo2S3 is a linear-chain-structure compound which has two inequivalent zig-zag Mo chains parallel to the b axis. It undergoes at least two phase transitions below room temperature {at 182 and 145 K upon cooling). X-ray-diffraction measurements show that both incommensurate and commensurate structural distortions are associated with the phase transitions. %'e report here the results of electrical-conductivity and thermoelectric-power measurements on MozS3. By using pulsed electric currents to rapidly heat and cool the sample while electrical-resistivity or thermoelectric-power measurements are being made, we are able to show that below the lower-temperature phase transition, the carriers in Mo2S3 can be either in a poorly conducting ground state or in a relatively highly conducting metastable state. The lifetime of a carrier in the metastable state is strongly dependent on the temperature and is more than 200 s at 77 K. The temperature dependence of the conductivity and all of the pulse conductivity measurements are consistent with a phenomenological doublewell-potential model for the carrier in MozS3. Three possible models which can give rise to such a double-well potential are discussed: (1) a defect-trapping model, (2) an acoustic-polaron model, and (3) a charge-density-wave model.

The Effect of Reactive Electric Field-Assisted Sintering of MoS2/Bi2Te3 Heterostructure on the Phase Integrity of Bi2Te3 Matrix and the Thermoelectric Properties

“…Contrary to the electrical transport tendency moving to a ‘semiconductor-like’ behavior with increasing MoS 2 molar ratio, the decreasing of | S | suggests a more ‘metal-like’ behavior that is not representative of the tetradymite main phase, which will be represented by a higher | S | (≈−190 μV K −1 at 300 K) [ 43 , 44 ]. However, this Seebeck value appears consistent with the report of the MoS 2 /Mo 2 S 3 nanocomposite [ 45 ], which gives us an insight into the non-negligible role of the S-deficient MoS 2 phases observed in the EDS mapping analysis ( Figures S4 and S5 ). Therefore, further investigations with higher accuracy than PXRD and EDS are required to fully confirm the presence of this latter phase and its contribution to the nanocomposites’ transport properties.…”

Surface reconstruction of MoS2 to Mo2S3

“…Though the bulk structure of Mo 2 S 3 has been relatively well studied [6][7][8], to our knowledge, its surface structure has not been reported. In this work, we present a combined theoretical and experimental investigation of the Mo 2 S 3 surface structure, obtained after phase transformation of MoS 2 to Mo 2 S 3 .…”

A DFT study and experimental evidence of the sonication-induced cleavage of molybdenum sulfide Mo2S3 in liquids

“…One such example is molybdenum sesquisulfide Mo 2 S 3 . [21][22][23][24][25] Bulk Mo 2 S 3 shows unusual electron transport properties at low temperatures due to the metal cluster formation, [26][27][28][29][30] and it has been suggested for use as an element for memory devices. 31 More recently, Mo 2 S 3 was investigated as a cathode material.…”