Abstract
The tri-axial grain alignment of thermoelectric Bi-based cobaltites with a misfit-layered structure by a modulated rotation magnetic field (MRF) of 10 tesla (T) was demonstrated. To maximize the degrees of tri-axial grain alignment in [(Bi2−xPbx)(AE2−yREy)O4]pCoO2 powder samples aligned under the MRF of 10 T, the following three crystallochemical approaches are important: doping of Pb into the Bi site, appropriate choice of an alkali earth (AE) ion, and doping of the appropriate rare earth (RE) ion into an AE site. Namely, simultaneous introduction of the relaxation effect of the misfit structure, creation of a domain structure with shear-type discontinuity, and single-ion magnetic anisotropy, which are induced by doping of Pb, Sr, and RE (Pr and Nd), respectively, into the Bi-based cobaltite achieved high degrees of tri-axial grain alignment below 4°. The present study provides a crystallochemical strategy for the fabrication of grain-aligned ceramics of misfit-layered Bi-based cobaltites with high thermoelectric performance by the magneto-scientific technique using MRF.
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