2010
DOI: 10.1080/10584587.2010.488579
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Investigation on Structure and Electrical Property of Perovskite Type Ba x Sr 1-x Co0.6Fe0.4O3-δ (x = 0.2–0.8) Oxides

Abstract: Ba x Sr 1-x Co 0.6 Fe 0.4 O 3-δ (0.2 ≤ x ≤ 0.8) synthesized by conventional solid state reaction method forms single phase solid solutions. The orthorhombic strontium cobaltite structure of host changes from orthorhombic to cubic with the increase in Ba mole fraction to x = 0.3, and again to orthorhombic for x = 0.4. For x ≥ 0.5, hexagonal barium cobaltite structure is obtained. All the samples with different compositions comprise of small particles and big agglomerates. The maximum electronic conductivity σ =… Show more

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Cited by 3 publications
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“…Rietveld Refinement results indicated that by incrementing the copper amount, the perovskite unit cell dimensions increased, as already observed in the literature with other perovskite oxides (Cowin et al, 2017): the unit cell length was slightly larger (3.8727 ± 0.0001 and 3.8747 ± 0.0003 Å for SCFCC10 and SCFCC20, respectively) and, accordingly, the cell volume expanded (from 58.08 ± 0.01 to 58.17 ± 0.01 Å 3 ). In fact, Cu 2+ , the most common oxidation state of copper, has an ionic radius of 0.73 Å under octahedral coordination (Nagrare and Bhoga, 2010;Renaudin et al, 2017), which is larger than Fe 3+ high spin (0.645 Å), Fe 4+ (0.585 Å), Co 3+ low spin (0.545 Å), and Co 4+ high spin (0.53 Å) in the same oxygen coordination. Thus, in a Sr 0.85 Ce 0.15 FeO 3 (whose volume is 58.5 Å 3 ), the substitution of iron with cobalt decreased the cell dimension (bringing the volume to 57.8 Å 3 ) (Tummino et al, 2017;Tummino et al, 2020), while copper addition enhanced it again.…”
Section: Powder Characterisationmentioning
confidence: 99%
“…Rietveld Refinement results indicated that by incrementing the copper amount, the perovskite unit cell dimensions increased, as already observed in the literature with other perovskite oxides (Cowin et al, 2017): the unit cell length was slightly larger (3.8727 ± 0.0001 and 3.8747 ± 0.0003 Å for SCFCC10 and SCFCC20, respectively) and, accordingly, the cell volume expanded (from 58.08 ± 0.01 to 58.17 ± 0.01 Å 3 ). In fact, Cu 2+ , the most common oxidation state of copper, has an ionic radius of 0.73 Å under octahedral coordination (Nagrare and Bhoga, 2010;Renaudin et al, 2017), which is larger than Fe 3+ high spin (0.645 Å), Fe 4+ (0.585 Å), Co 3+ low spin (0.545 Å), and Co 4+ high spin (0.53 Å) in the same oxygen coordination. Thus, in a Sr 0.85 Ce 0.15 FeO 3 (whose volume is 58.5 Å 3 ), the substitution of iron with cobalt decreased the cell dimension (bringing the volume to 57.8 Å 3 ) (Tummino et al, 2017;Tummino et al, 2020), while copper addition enhanced it again.…”
Section: Powder Characterisationmentioning
confidence: 99%