Thermoelectric studies and magnetic behavior of the new dichalcogenides Rh1-xPdxTe2, Ir1-xPdxTe2 and Rh1-xIrxTe2 with (0 ≤ x ≤ 1)

FLORENCIA LURGO; RODOLFO SANCHEZ; RAÚL CARBONIO

Washington

Congreso; DXC- 69th Annual Denver X-Ray Conference; 2020

ICDD

We synthetized the three new dichalcogenides families Rh1-xPdxTe2, Pd1-xIrxTe2 and Rh1-xIrxTe2 in vacuum evacuated quartz ampoule and cooling by quenching. All the compounds show a P-3m1 (SG 164) hexagonal rearrangement. The compound IrTe2 show a reversible structural transition near to 200K (P-3m1 to P-1) [1-12] monitored by X-ray diffraction by light synchrotron. SEM images show ?small bubbles? in the crystals of the compounds that contain only Te, this can be interpreted as a small excess of Te not detected for X-ray techniques. We report thermoelectric properties for all the compounds. The electrical resistivity (ρ) for the compounds shows a Fermi liquid behavior in the temperature range (4-300K). Seebeck coefficient (S) data indicate hole-type carriers and 1022 carrier concentration. The electronic thermal conductivity (κₑ) was determined by Wiedemann-Franz law. The merit figure (ZT) determines regular thermoelectric materials and those are due to the fact that the carrier concentration is greater than the ideal to have a very good thermoelectric material. The magnetic measurements (χ vs T) show a Pauli paramagnetism behavior with strong interactions electron-phonon characteristic of metals.