title: Thermoelectric performance of layered SrxTiSe2 above 300 K.
abstract: In this paper we report the thermoelectric performance of Sr intercalated TiSe(2) above 300 K. Refined x-ray diffraction, high resolution transmission electron microscopy and scanning electron microscopy images show well oriented polycrystalline grains along a (0 0 l) direction and layered growth of the sample. Intercalation of Sr in TiSe(2) shows an improved Seebeck coefficient (α) value without altering the polarity of the majority charge carrier. A drastic reduction in the thermal conductivity (κ) from 3.8 W m K(-1) to 1.2 W m K(-1) (at 650 K) was observed which is ascribed to the: (i) scattering of the phonon by natural layer interfaces, grain boundaries and lattice defects and (ii) rattling of intercalated Sr atoms among weakly bound TiSe(2) layers. This led to the maximum ZT of ~0.08 at 650 K for Sr(x)TiSe(2) (x > 0.1) which is almost twice as high as the parent TiSe(2).
authors.affiliation: Technical Physics Division, Bhabha Atomic Research Center, Mumbai-400 085, India.
authors.forename: Ranu
authors.initials: R
authors.lastname: Bhatt
authors.forename: Miral
authors.initials: M
authors.lastname: Patel
authors.forename: Shovit
authors.initials: S
authors.lastname: Bhattacharya
authors.forename: Ranita
authors.initials: R
authors.lastname: Basu
authors.forename: Sajid
authors.initials: S
authors.lastname: Ahmad
authors.forename: Pramod
authors.initials: P
authors.lastname: Bhatt
authors.forename: A K
authors.initials: AK
authors.lastname: Chauhan
authors.forename: M
authors.initials: M
authors.lastname: Navneethan
authors.forename: Y
authors.initials: Y
authors.lastname: Hayakawa
authors.forename: Ajay
authors.initials: A
authors.lastname: Singh
authors.forename: D K
authors.initials: DK
authors.lastname: Aswal
authors.forename: S K
authors.initials: SK
authors.lastname: Gupta