Thermoelectric properties of the LaCoO3-LaCrO3 system using a high-throughput combinatorial approach

Abstract

A combinatorial film of the LaCo 1-x Cr x O 3 system was fabricated using the LaCoO 3 and LaCrO 3 targets at the NIST Pulsed Laser Deposition (PLD) facility. As the ionic size of Cr 3+ is greater than that of Co 3+ , the unit cell volume of the series increases with increasing x. Using a custom screening tool, the Seebeck coefficient of LaCo 1-x Cr x O 3 approaches a measured maximum of 286 μV/K, near to the cobalt-rich end of the film library (with x ≈ 0.49). The resistivity value increases continuously with increasing x. The measured power factor, PF, of this series, which is related to the efficiency of energy conversion, also exhibits a maximum at the composition of x ≈ 0.49, which corresponds to the maximum value of the Seebeck coefficient. Our results illustrate the efficiency of applying the high-throughput combinatorial technique to study thermoelectric materials.

The electrical modulus and other dielectric properties by the impedance spectroscopy of LaCrO3and LaCr0.90Ir0.10O3perovskites

“… 35–38 The doped transition metal type has significant impact on the LCO properties because it changes almost all LCO parameter including physical and chemical. Many doping studies have been conducted on the LCO with various transition metals including Sr, 39 Co, 40 Ni, 41 V, 41 Cu, 41 Mn, 42 Ca, 43 Pd 44 etc.…”

Anomalous Thermal Expansion of HoCo0.5Cr0.5O3 Probed by X-ray Synchrotron Powder Diffraction

“…Currently R CoO 3 and R CrO 3 compounds and solid solutions on their basis are attracting renewed research interest aroused by their potential application as multifunctional materials [10–13]. R CoO 3 -based materials are of particular interest, due to dependency of their transport, magnetic and other properties on spin state of Co 3+ ions, which can change with increasing of the temperature from low spin (LS, t 2 g 6 e g 0 , S  = 0), to intermediate (IS, t 2 g 5 e g 1 , S  = 1) and high spin (HS, t 2 g 4 e g 2 , S  = 2) configurations ([14–16] and references herein).…”

“…Rare earth ( R ) cobaltites R CoO 3 and chromites R CrO 3 with perovskite structure due to their high electrical conductivity, specific magnetic properties, as well as significant electrochemical and catalytic activity are considered as prospective electrode and interconnect materials for solid oxide fuel cells (SOFC) [ 1 – 3 ], thermoelectric and magnetocaloric materials [ 4 – 6 ], catalysts and humidity and gas sensors [ 7 – 9 ]. Currently R CoO 3 and R CrO 3 compounds and solid solutions on their basis are attracting renewed research interest aroused by their potential application as multifunctional materials [ 10 – 13 ]. R CoO 3 -based materials are of particular interest, due to dependency of their transport, magnetic and other properties on spin state of Co 3+ ions, which can change with increasing of the temperature from low spin (LS, t 2 g 6 e g 0 , S = 0), to intermediate (IS, t 2 g 5 e g 1 , S = 1) and high spin (HS, t 2 g 4 e g 2 , S = 2) configurations ([ 14 – 16 ] and references herein).…”

ABO3 and A1−xCxB1−yDy(O1−zEz)3: review of experimental optimisation of thin film perovskites by high-throughput evaporative physical vapour deposition

“…42 If not already necessary during the synthesis steps, most of these methods (apart from hydrothermal processing) will require elevated sintering conditions to finalise the synthesis step and produce high density materials. Thin film perovskites have been synthesised using CVD 11,13,43,44 , ALD 12,[45][46][47][48] , PLD [49][50][51][52][53][54][55][56][57] , CSD 58,59 sputtering 60,61 and evaporative PVD 10 . However, most of these studies focus on single compositions perovskites or a few discreet compositions.…”

“…In terms of using a high throughput approach, a number of studies refer to computational methods making use of a limited number of experimental points for comparison [62][63][64][65][66][67][68][69][70] . Approaches allowing the rapid synthesis and screening of perovskite materials with extended variation in the compositional space are limited by the synthesis method used 54,56,57,[59][60][61][71][72][73][74][75][76] . Where some control of the cationic concentrations can be achieved by combinatorial methods, the necessity to employ high temperatures to ensure crystallisation can lead to a difficulty in achieving stoichiometric anionic concentrations.…”