Journal ArticleDOI
Fabrication of textured thermoelectric layered cobaltites with various rock salt-type layers by using β-Co(OH) 2 platelets as reactive templates
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TLDR
In this paper, textured bulk ceramics have been prepared of various cobaltites including the common CdI2-type CoO2 layer by using β-Co(OH)2 platelets as reactive templates, and their thermoelectric properties have been examined.Abstract:
Textured bulk ceramics have been prepared of various cobaltites including the common CdI2-type CoO2 layer (i.e., [Ca2(Co0.65Cu0.35)2O4]0.624[CoO2]: CCO-4-layer, [Bi2M2−xO4]p[CoO2]
(M2
= Sr2: BSCO, M2
= Ca1Sr1: B(SC)CO, M2
= Ca2: BCCO)) by using β-Co(OH)2
(CdI2-type) platelets as reactive templates, and their thermoelectric (TE) properties have been examined. All the specimens were found to be highly c-axis aligned ceramics. Especially for CCO-4-layer, B(SC)CO and BCCO, the present study is the first report on the fabrication of textured ceramics. Our textured ceramic specimens exhibited larger values of electrical conductivity (σ) than the ceramics prepared by a conventional solid-state reaction (SSR specimens): e.g., σab
= 0.46 × 104 S m−1 for the textured specimen and σSSR
=
∼0.26 × 104 S m−1 at 1060 K for the SSR specimen for BCCO. This study indicated that our preparation method using β-Co(OH)2 templates is a versatile and effective technique to fabricate cobaltites, including CoO2 layers, with a high degree of orientation and improved TE properties.read more
Citations
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Journal ArticleDOI
Thermoelectric Ceramics for Energy Harvesting
Kunihito Koumoto,Ryoji Funahashi,Emmanuel Guilmeau,Yuzuru Miyazaki,Anke Weidenkaff,Yifeng Wang,Yifeng Wang,Chunlei Wan +7 more
TL;DR: In this paper, the authors review previous studies in the field of thermoelectric materials development and make recommendations for each material regarding future research, and demonstrate the potential of TE modules composed of metal oxide materials and the prospect of their commercialization for energy harvesting.
Journal ArticleDOI
Comparison of the high temperature thermoelectric properties for Ag-doped and Ag-added Ca3Co4O9
TL;DR: Sui et al. as discussed by the authors proposed a method to solve the problem of Chinese Academia by using Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China.
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High thermoelectric performance of poly (2,5 -dimethoxyphenylenevinylene) and its derivatives
TL;DR: In this article, a series of copolymers consisting of both 2,5-dimethoxy-substituted phenylenevinylene units and unsubstitution units (P(MeOPV- co -PV)) were evaluated from the viewpoint of their thermoelectric properties.
Journal ArticleDOI
Reactive-templated grain growth processing for lead free piezoelectric ceramics
TL;DR: In this paper, texture engineering using reactive-templated grain growth (RTGG) is reviewed as a key processing technique for lead free piezoelectric ceramics.
Journal ArticleDOI
Texture engineering of electronic ceramics by the reactive-templated grain growth method
TL;DR: In this paper, a reactive-templated grain growth (RTGG) is applied to simple perovskite-type materials, yielding highly textured polycrystals with enhanced piezoelectric properties.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
Journal ArticleDOI
Large thermoelectric power in NaCo 2 O 4 single crystals
TL;DR: In this article, the authors measured and analyzed the transport properties of a single-crystal transition-metal oxide and found that the resistivity is highly anisotropic between in-and out-of-plane directions.
Journal ArticleDOI
Topotactical reactions with ferrimagnetic oxides having hexagonal crystal structures—I
TL;DR: In this article, a new method is described for the preparation of polycrystalline materials with oriented crystals by reaction of the oriented grains of a strongly anisotropic ferrimagnetic with non-oriented grains of usually non-magnetic components.
Journal ArticleDOI
Misfit-layered cobaltite with an anisotropic giant magnetoresistance: Ca 3 Co 4 O 9
A.C. Masset,Claude Michel,A. Maignan,M. Hervieu,Olivier Toulemonde,F. Studer,B. Raveau,Jiri Hejtmanek +7 more
TL;DR: In this article, a structural model for the cobaltite with three different oxidation states 2+, 3+, and 4+, in agreement with x-ray appearance near-edge structure spectra at the Co K edge was found.
Journal ArticleDOI
Electrical and thermal properties of single-crystalline (Ca2CoO3)0.7CoO2 with a Ca3Co4O9 structure
Masahiro Shikano,Ryoji Funahashi +1 more
TL;DR: In this paper, single crystals of (Ca2CoO3)0.7CoO2 were grown using a modified strontium chloride flux technique, and their electrical and thermal properties were determined.