Improvement in electrical properties of thermoelectric CuAlO<sub>2</sub> ceramics aided by aluminosilicate glass

Ma, Bingchuang; Zhu, Mankang; Zheng, Mupeng; Hou, Yudong

doi:10.1111/ijac.12890

Cited by 8 publications

(5 citation statements)

References 24 publications

(52 reference statements)

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“…At the same time, SEM images shows that there exists a lot of pores among all the samples. It affirms poor sintering activity of CuAlO2 ceramic [23]. Grains with different sizes and poor compactness can be observed in all samples, these lead to a great difference in the electrical conductivity.…”

Section: Microstructuresupporting

confidence: 70%

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO₂ Ceramics

Liu

Wang²,

Ma³

2022

J. Phys.: Conf. Ser.

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To improve the properties of CuAlO2 thin films, the preparation of CuAlO2 ceramics with excellent properties is an important prerequisite, and the optimization of ceramic properties is often achieved by doping. Zn-doped CuAlO2 ceramics were prepared by the solid phase sintering method. The structural, electrical and magnetic properties of Zn-doped CuAlO2 ceramics were systematically studied. The results show that the crystal structure of the as-sintered Zn-doped CuAlO2 was rhombohedral, space group R3m. Grain size of samples grew with the amount of Zn increases, which is related to the enhancement of CuAl2O4 phases in the sample ceramics. The density of doped ceramics changed when increasing Zn-doping concentration compared to undoped ceramics. It reached a minimum 0.96 g/cm3. The resistivity of Zn-doped CuAlO2 ceramic samples climbed with the increase of Zn content, and it can reach 59.6 Ω•cm at 10 mol%. The ferromagnetic behavior was enhanced with increasing the Zn concentration.

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Section: Microstructuresupporting

confidence: 70%

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO₂ Ceramics

Liu

Wang²,

Ma³

2022

J. Phys.: Conf. Ser.

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“…The intercrystalline pores got smaller and smaller with the increase of sintering temperature, whereas the intragranular pores became more and more big, as shown in Figure 10D,E. It was well known that the electrical conductivity can be reinforced intensively by a denser and more uniform microstructure for the lower diffusion resistance of carriers through the samples 32 . When the sintering temperature increased from 1250 to 1300°C, the relative density increased from 95.12% to 97.35%, whereas the gain sizes grew from 9.83 ± .87 to 12.48 ± 1.24 μm.…”

Section: Resultsmentioning

confidence: 91%

“…It was well known that the electrical conductivity can be reinforced intensively by a denser and more uniform microstructure for the lower diffusion resistance of carriers through the samples. 32 When the sintering temperature increased from 1250 to 1300 • C, the relative density increased from 95.12% to 97.35%, whereas the gain sizes grew from 9.83 ± .87 to 12.48 ± 1.24 μm. The existence of gaseous pores as a second phase damaged the continuity of the solid phase.…”

Section: Electrical Conductivitymentioning

confidence: 93%

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Zhang

2022

Int J Applied Ceramic Tech

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Sintering kinetics of NiFe 2 O 4 -based ceramics inert anodes for aluminum electrolysis doped 7 wt% TiN nanoparticles were conducted to investigate densification and grain growth behaviors. The linear shrinkage increased gradually with the increasing sintering temperature between 1000 and 1450 • C, whereas the linear shrinkage rate exhibited a broad peak. The maximum linear shrinkage rate was obtained at 1189.4 • C, and the highest densification rate was achieved at the relative density of 75.20%. Based on the pressureless sintering kinetics window, the sintering process was divided into the initial stage, the intermediate stage, and the final stage. The grain growth exponent reduced with increased sintering temperature, whereas the grain growth activation energy decreased by increasing sintering temperature and shortening dwelling time. The grain growth was mainly controlled by atomic diffusion. NiFe 2 O 4 -based ceramics possessed hightemperature semiconductor essential characteristics. The electrical conductivity of NiFe 2 O 4 -based ceramics first increased and then decreased with increasing sintering temperature, reached their maximum value (960 • C) of 33.45 S/cm under 1300 • C, mainly attributed to the relatively dense and uniform microstructure. The thermal shock resistance of NiFe 2 O 4 -based ceramic was improved by a stronger grain boundary bonding strength and lower coefficient of linear thermal expansion.

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“…In addition, the porosity decreased with the increase of TiN nanoparticles content. A denser microstructure was beneficial to reduce the negative effect of electron scattering on the mobility of current carrier and shorten the conductive pathway of carriers 33 . Therefore, the electrical conductivity of NiFe 2 O 4 ‐based ceramics was enhanced notably with the increase of TiN nanoparticles content.…”

Section: Resultsmentioning

confidence: 99%

Effect of TiN content on properties of NiFe₂O₄‐based ceramic inert anode for aluminum electrolysis

Zhang

Wang

et al. 2021

Int J Applied Ceramic Tech

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There is an intense desire for the substitution of the consumable carbon anode by inert anode (also called non-consumable or oxygen-evolving anode) in the Hall-Héroult process, which would drastically reduce the substantial emission of greenhouse gases such as CO 2 and perfluorocarbons. 1−3 The upgrading of suitable non-carbon anode is highly challenged on account of the numerous restrictive requirements for inert anode materials in the rugged environment of Al electrolytic cell. 2 The basic requirements for an inert anode are as follows: prominent oxidation resistance at high temperature, remarkable corrosion resistance to electrolyte molten salt, high electric conductivity, excellent thermal shock resistance, mechanical robustness, and so on. Up to now, despite major research efforts from Al producers and academic laboratories, no acceptable inert anode material has yet been found for long-term use in industrial Al electrolytic cell.Among the possible inert anode materials (namely, metal, ceramic, and cermet) that have been explored, NiFe 2 O 4based cermet is ranked as the most appropriate candidate, largely owing to the accredited combination of the features of NiFe 2 O 4 ceramics and metals, namely, excellent oxidation resistance at high temperature and high corrosion resistance

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Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Cited by 8 publications

References 24 publications

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO₂ Ceramics

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO₂ Ceramics

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Effect of TiN content on properties of NiFe₂O₄‐based ceramic inert anode for aluminum electrolysis

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Improvement in electrical properties of thermoelectric CuAlO2 ceramics aided by aluminosilicate glass

Cited by 8 publications

References 24 publications

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO2 Ceramics

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO2 Ceramics

Sintering kinetics and properties of NiFe2O4‐based ceramics inert anodes doped with TiN nanoparticles

Effect of TiN content on properties of NiFe2O4‐based ceramic inert anode for aluminum electrolysis

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Product

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About

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO₂ Ceramics

Study on Structural, Electrical and Magnetical Properties of Zn Doped CuAlO₂ Ceramics

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Effect of TiN content on properties of NiFe₂O₄‐based ceramic inert anode for aluminum electrolysis