Property-processing relations in developing thermoelectric ceramics: Na1−x Co2O4

Yamakawa, Hiroo; Lee, Soonil; Takagi, Hiroshi; Randall, Clive A.

doi:10.1007/s10853-010-5039-6

Cited by 7 publications

(2 citation statements)

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“…The pure NN ceramics were prepared without use of any sintering additives using the low-pO 2 process, and the microstructure and dielectric and ferroelectric properties were investigated and compared to those of conventional calcination and firing process in air atmosphere. This example may then be of interest to a broader number of materials in the functional oxide family that involve processing difficulties with alkali volatility, such as the thermoelectric oxide NaCoO 4 , [24][25][26] and other ferroelectrics NaTaO 3 , KTaO 3 , and KNbO 3 . 1,[27][28][29][30][31][32]…”

Section: Introductionmentioning

confidence: 99%

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO₃

et al. 2014

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This work focused on the processing of low oxygen partial pressure (low‐pO2) calcination and sintering with respect to NaNbO3 (NN) of one key member in ferroelectric (Na,K)NbO3. The high‐density NN ceramics were successfully prepared without any sintering additives using the low‐pO2 process. Comparing conventional air process, the low‐pO2 calcined NN powders showed lower defect concentration and higher densification. The low‐pO2 sintered NN ceramics had dielectric constant and dielectric loss performance at high temperatures. Furthermore, the low‐pO2 sintered NN ceramics indicated ferroelectric behavior, and both maximum polarization and strain improved to two to three times that of conventional air‐sintered NN ceramics. From this relatively simple compound, NN, the advantage of low‐pO2 is unambiguously demonstrated and points to its consideration. It is hypotheses as a kinetically controlled process that limits the volatility under low‐pO2 condition.

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Section: Introductionmentioning

confidence: 99%

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO₃

et al. 2014

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“…In recent years, oxide materials have been focused on for the promising candidate for thermoelectric applications because they are stable, less toxic, and environment friendly at relatively high temperature. One of the promising oxide materials is based on non-stoichiometric sodium cobalt oxides [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Thermoelectric Properties of Highly Oriented NaxCo2O4 by Solution Combustion Synthesis Method

Zhang

Okinaka

Tosho³

et al. 2011

AMM

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NaxCo2O4 (x= 1.4~1.9) ceramics were synthesized by solution combustion synthesis (SCS) method and sintered by spark plasma sintering (SPS) method in this paper. The synthesized bulk samples showed a relatively high orientation degree analyzed by XRD. Thermoelectric properties of the as synthesized bulk samples were investigated in the direction parallel to the press direction of SPS from room temperature to 857 K. Among all the samples, the highest power factor 3.07 ´ 10-4 W×m-1×K-2 was obtained at 817 K when x = 1.6, and the highest ZT value of this sample was 0.064 at 817 K.

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Sol–gel synthesis of sodium and lithium based materials

Hildebrandt

Eva

Komissinskiy

et al. 2012

J Sol-Gel Sci Technol

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Property-processing relations in developing thermoelectric ceramics: Na1−x Co2O4

Cited by 7 publications

References 22 publications

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO₃

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO₃

Preparation and Thermoelectric Properties of Highly Oriented Na<sub>x</sub>Co<sub>2</sub>O<sub>4</sub> by Solution Combustion Synthesis Method

Sol–gel synthesis of sodium and lithium based materials

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Property-processing relations in developing thermoelectric ceramics: Na1−x Co2O4

Cited by 7 publications

References 22 publications

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO3

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO3

Preparation and Thermoelectric Properties of Highly Oriented Na<sub>x</sub>Co<sub>2</sub>O<sub>4</sub> by Solution Combustion Synthesis Method

Sol–gel synthesis of sodium and lithium based materials

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Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO₃

Advantages of Low Partial Pressure of Oxygen Processing of Alkali Niobate: NaNbO₃