Fabrication of grain-aligned bulks and thick films of misfit layered cobalt oxides by a magneto-scientific process

S. Horii, T. Okamoto, T. Kumagai, T. Uchikoshi, Tohru Suzuki, Y. Sakka, J. Shimoyama, K. Kishio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We report the preparation of grain-aligned [Ca2CoO 3-δ]0.62CoO2 (Ca349) thick films and the conversion of the easy axis of magnetization from the a-axis to the c-axis. The thick films were fabricated by a simultaneous usage of electrophoretic deposition and magnetic alignment methods (MEPD) at high deposition rate with the order of 10 μm/min. Moreover, a multi-layered thick film of Al 2O3/Ca349/Al2O3/Ca 0.9La0.1MnO3/ Al2O3 was also fabricated by the MEPD method by the optimization of condition of each suspension. The conversion of the easy axis was performed crystallochemically for a [Bi2Sr2O4]0.55CoO 2(BiSr222) compound with the easy axis parallel to the a-axis in order to fabricate c-axis grain-oriented bulks by the magnetic alignment method. The substitution of Ca for Sr in the [(Bi0.5Pb0.5)Sr 2O4] block layer induced the change of the easy axis into the c-axis direction, and the magnetic anisotropy was increased by the partial substitution of rare earth elements of Pr, Nd, Tb and Dy for Ca. Using a compound of [(Bi0.5Pb0.5)2Ca 0.8Pr0.2)2O4]0.55CoO 2, we have successfully prepared the c-axis grain-aligned bulk by the magneto-scientific method. Our present results indicate that the magneto-scientific method is one of the practical processes for production of thermoelectric modules.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages433-438
Number of pages6
Publication statusPublished - 2006 May 8
Externally publishedYes
Event2005 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: 2005 Nov 282005 Dec 1

Publication series

NameMaterials Research Society Symposium Proceedings
Volume886
ISSN (Print)0272-9172

Conference

Conference2005 Materials Research Society Fall Meeting
CountryUnited States
CityBoston, MA
Period05/11/2805/12/1

Fingerprint

cobalt oxides
Thick films
thick films
Cobalt
Fabrication
fabrication
Oxides
Substitution reactions
Magnetic anisotropy
Deposition rates
Rare earth elements
Magnetization
Suspensions
alignment
cobalt oxide
substitutes
rare earth elements
modules
magnetization
preparation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Horii, S., Okamoto, T., Kumagai, T., Uchikoshi, T., Suzuki, T., Sakka, Y., ... Kishio, K. (2006). Fabrication of grain-aligned bulks and thick films of misfit layered cobalt oxides by a magneto-scientific process. In Materials Research Society Symposium Proceedings (pp. 433-438). (Materials Research Society Symposium Proceedings; Vol. 886).

Fabrication of grain-aligned bulks and thick films of misfit layered cobalt oxides by a magneto-scientific process. / Horii, S.; Okamoto, T.; Kumagai, T.; Uchikoshi, T.; Suzuki, Tohru; Sakka, Y.; Shimoyama, J.; Kishio, K.

Materials Research Society Symposium Proceedings. 2006. p. 433-438 (Materials Research Society Symposium Proceedings; Vol. 886).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Horii, S, Okamoto, T, Kumagai, T, Uchikoshi, T, Suzuki, T, Sakka, Y, Shimoyama, J & Kishio, K 2006, Fabrication of grain-aligned bulks and thick films of misfit layered cobalt oxides by a magneto-scientific process. in Materials Research Society Symposium Proceedings. Materials Research Society Symposium Proceedings, vol. 886, pp. 433-438, 2005 Materials Research Society Fall Meeting, Boston, MA, United States, 05/11/28.
Horii S, Okamoto T, Kumagai T, Uchikoshi T, Suzuki T, Sakka Y et al. Fabrication of grain-aligned bulks and thick films of misfit layered cobalt oxides by a magneto-scientific process. In Materials Research Society Symposium Proceedings. 2006. p. 433-438. (Materials Research Society Symposium Proceedings).
Horii, S. ; Okamoto, T. ; Kumagai, T. ; Uchikoshi, T. ; Suzuki, Tohru ; Sakka, Y. ; Shimoyama, J. ; Kishio, K. / Fabrication of grain-aligned bulks and thick films of misfit layered cobalt oxides by a magneto-scientific process. Materials Research Society Symposium Proceedings. 2006. pp. 433-438 (Materials Research Society Symposium Proceedings).
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