Thermoelectric properties of Fe doped SiC ceramics.

Inai, Hiroshi; Satoh, Yóichi; Morimoto, Jun

doi:10.2978/jsas.11.3_188

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…I N ADDITION to interest in its properties for structural applications, silicon carbide has more recently been the focus of many investigations for its electronic properties. [1][2][3][4][5] As a wide-gap semiconductor, it has received considerable attention as a material for high-power device applications, including radar and microwave applications under extreme conditions. It has a high critical field strength, good carrier mobility, and excellent thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Consolidation of Nanostructured β‐SiC by Spark Plasma Sintering

Yamamoto

Kitaura

Kodera

et al. 2004

Journal of the American Ceramic Society

111

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Nanostructured ␤-SiC, with crystallite size in the range of 5-20 nm in agglomerates of 50 -150 nm, was formed by reactive high-energy ball milling and consolidated to a relative density of 98% by sintering at 1700°C without the use of additives. X-ray line broadening analysis gave a crystallite size of 25 nm, while transmission electron microscopy observations showed the crystallite size to be in the range of 30 -50 nm. Evidence demonstrating the role of a disorder-order transformation in the densification process is provided by changes in the diffraction peak patterns and in the integral width with temperature. R. Riedel-contributing editorManuscript No. 10245.

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Section: Introductionmentioning

confidence: 99%

Consolidation of Nanostructured β‐SiC by Spark Plasma Sintering

Yamamoto

Kitaura

Kodera

et al. 2004

Journal of the American Ceramic Society

111

View full text Add to dashboard Cite

show abstract

“…The thermal conductivity monotonically increased from 117 Wm −1 K −1 in A0 to 154 Wm −1 K −1 in A100 sample due to (1) an increased 6H-SiC content, which has a higher intrinsic thermal conductivity compared with that of 4H-SiC, 23 (2) the lower soluble impurity content of the α-SiC starting powders (Table 1), and (3) an increased relative density with increasing initial α-phase content (Table 2). 23 Soluble impurities, such as Fe and V, 40,41 act as phonon scattering sites in the SiC lattice and deteriorate the thermal conductivity. The reported thermal conductivities of solid-state sintered SiC ceramics varies from 107 to 192 Wm −1 K −1 depending on the composition and processing conditions (Table 3).…”

Section: Electrical and Thermal Propertiesmentioning

confidence: 99%

Effects of initial α‐phase content on properties of pressureless solid‐state sintered SiC ceramics

Malik

Kim

2021

Int J Applied Ceramic Tech

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α‐ and β‐SiC starting powders of similar particle sizes were used to investigate the effect of initial α‐phase content on the electrical, thermal, and mechanical properties of pressureless solid‐state sintered (PSS) SiC ceramics with B4C and C additives. For β‐SiC starting powders, a coarse‐grained microstructure with elongated platelet grains was formed by the transformation of 3C to 6H and finally to 4H‐SiC phase. In contrast, materials prepared from α‐SiC powders exhibited a fine‐grained microstructure with platelet grains. This study revealed the beneficial effect of α‐SiC starting powders in achieving low electrical resistivity and high thermal conductivity in PSS SiC ceramics, which was attributable to their higher sinterability, lower impurity content, and lower 6H to 4H‐SiC phase transformation rate compared with β‐SiC powders. The electrical resistivity decreased by an order of magnitude and the thermal conductivity increased by 32% with an increase in initial α‐phase content from 0 to 100%. The flexural strength increased by approximately 16% with increasing initial α‐phase content due to a decreased flaw size with decreasing grain size. However, the fracture toughness and hardness were insensitive to the change in initial α‐phase content.

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“…The thermal conductivity monotonically increased from 117.1 Wm − 1 K − 1 in A0 to 154.2 Wm − 1 K − 1 in A100 due to (1) an increased 6H-SiC content, which has a higher intrinsic thermal conductivity compared to that of 4H-SiC [38] and (2) the low soluble impurity content of the α-SiC starting powders (refer to Table1). Soluble impurities, such as Fe and V[55, 56], act as phonon scattering sites in the SiC lattice and deteriorate the thermal conductivity. As shown in Table…”

mentioning

confidence: 99%

Effects of initial α-phase content on the electrical, thermal, and mechanical properties of pressureless solid-state sintered SiC ceramics

Malik¹,

Kim²

2021

Preprint

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αand β-SiC starting powders of similar particle sizes were used to investigate the effect of initial α-phase content on the electrical, thermal, and mechanical properties of pressureless solid-state sintered (PSS) SiC ceramics with B4C and C. For β-SiC starting powders, a coarse-grained microstructure with elongated platelet grains formed by the 3C to 6H to 4H-SiC phase transformation was obtained. In contrast, α-SiC powders exhibited a fine-grained microstructure with platelet grains. The electrical resistivity decreased by an order of magnitude with increasing initial α-phase content presumably due to (1) an increased 6H-SiC content causing a decrease in bandgap energy and (2) the low soluble impurity content (Fe and V) of the α-SiC powders. The thermal conductivity increased by approximately 32% with increasing initial α-phase content due to (1) an increased 6H-SiC content, which has a higher intrinsic thermal conductivity compared to 4H and (2) the low impurity content of the α-SiC powders. The flexural strength increased by approximately 16% with increasing initial α-phase content due to a decreased flaw size with decreasing grain size. However, the fracture toughness and hardness were insensitive to the change in initial α-phase content.

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Thermoelectric properties of Fe doped SiC ceramics.

Cited by 7 publications

References 7 publications

Consolidation of Nanostructured β‐SiC by Spark Plasma Sintering

Consolidation of Nanostructured β‐SiC by Spark Plasma Sintering

Effects of initial α‐phase content on properties of pressureless solid‐state sintered SiC ceramics

Effects of initial α-phase content on the electrical, thermal, and mechanical properties of pressureless solid-state sintered SiC ceramics

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