Enhanced thermoelectric properties at x∼0.1 in La/sub 1-x/Sr/sub x/CoO/sub 3/ and La/sub 1-x/Sr/sub x/(Co/sub 1-y/M/sub y/)O/sub 3/ (M=Cr, Cu)

Synergistic effect of lattice, electronic and magnetic modulations on the thermoelectric behaviour of Cr-substituted La0.65Bi0.20Sr0.15CoO3

“…36 In 2004, H. Fujishiro et al showed that the 5% Cr doped La 0.85 Sr 0.15 Co 0.95 Cr 0.05 O 3 (LSCCr x O) sample shows a comparatively high figure of merit ( Z value) relative to the pristine undoped La 0.85 Sr 0.15 CoO 3 sample. 25 Later in 2016, I. O. Troyanchuk et al demonstrated a large negative magnetoresistance (∼40%) at low temperatures (≲50 K) in Cr-doped La 0.5 Sr 0.5 Co 0.8 Cr 0.2 O 3 . 26 These two works in the literature motivate us to study the magneto-thermoelectric properties of the Cr doped La 0.65 Bi 0.20 Sr 0.15 Co 1− x Cr x O 3 system and explore the possibility of tailoring the thermoelectric properties at lower temperatures (≲50 K) using magnetic field.…”

“…[18][19][20] The transport phenomena of LaCoO 3 have been intensively investigated for various di/tri-valent ion substitutions (Ca 2+ , Sr 2+ , Ba 2+ , Gd 3+ , Y 3+ , Mg 2+ , Al 3+ , Mn 3+ , Ni 2+ , Fe 3+ ) on both A and B sites. 19,[21][22][23][24][25] Among these, Sr 2+ substitution at the La 3+ site (i.e., La 1−x Sr x CoO 3 or LSCO) has shown spin glass insulating to ferromagnetic (FM) metallic state transition along with the thermoelectric properties at room temperature. [26][27][28][29][30] Thermoelectric efficiency of the La 1−x Sr x CoO 3 is observed to be maximum for 5% Sr substitution i.e., La 0.95 -Sr 0.05 CoO 3 , having a room temperature (RT) value of ZT ∼ 0.06.…”

“…18–20 The transport phenomena of LaCoO 3 have been intensively investigated for various di/tri-valent ion substitutions (Ca 2+ , Sr 2+ , Ba 2+ , Gd 3+ , Y 3+ , Mg 2+ , Al 3+ , Mn 3+ , Ni 2+ , Fe 3+ ) on both A and B sites. 19,21–25 Among these, Sr 2+ substitution at the La 3+ site ( i.e. , La 1− x Sr x CoO 3 or LSCO) has shown spin glass insulating to ferromagnetic (FM) metallic state transition along with the thermoelectric properties at room temperature.…”