Synthesis and properties of disubstituted derivatives of layered calcium cobaltite
Source abstract
Abstract
Disubstituted solid solutions Ca2.8Ln0.1Bi0.1Co4O9 + δ, Ca3Co3.85Fe0.075Bi0.075O9 + δ, and Ca2.8Ln0.2Co3.85M0.15O9 + δ (Ln = Tb, Er; M = Fe, Bi) are synthesized based on layered calcium cobaltite by the citrate method; the parameters of their crystalline structures are defined, and their thermal, electrophysical, and thermoelectric properties are studied. It is shown that the resulting oxides are p-type semiconductors whose thermal conductivity and linear thermal expansion coefficient decline and the apparent electroconductivity activation energy increases upon substitution of the calcium and cobalt ions for the heavier metal ions. It is established that the highest power factor is demonstrated by the Ca2.8Tb0.2Co3.85Bi0.15O9 + δ solid solution (P 1100 = 0.140 mW/(m K2)), and the highest thermoelectric merit index is manifested by Ca2.8Er0.2Co3.85Bi0.15O9 + δ (ZT 423 = 0.009), which are higher than the corresponding values of the basic phase Ca3Co4O9 + δ at the same temperatures by 40 and 50%, respectively.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal Expansion and Ionic Conductivity · Thermodynamic and Structural Properties of Metals and Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (18)
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