Thermoelectric properties of Sm1−xLaxBaCuFeO5 ceramics

Zeng, Chengcheng; Liu, Yaochun; Lan, Jinle; Ren, Guang-Kun; Lin, Yuanhua; Li, Ming; Nan, Ce‐Wen

doi:10.1016/j.materresbull.2014.10.046

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…Thus, in the present case, the decrease in the electrical conductivity of Gd 0.5 La 0.5 BaCuFeO 5+δ may be dominated by the transport properties of LaBaCuFeO 5+δ . Furthermore, we have investigated the same phenomenon in our previous work on Sm 0.5 La 0.5 BaCuFeO 5+δ . The same phenomenon can be observed in LaFeO 3 .…”

Section: Resultssupporting

confidence: 66%

“…As reported in the literature, GdBaCuFeO 5+δ , a member of A′A″B 2 O 5+δ family , exhibits a relatively higher Seebeck coefficient value of about 230 μV/K at high temperature and an appropriate low thermal conductivity of about 2.5 W·(m·K) −1 , but the issue pertains to its lower electrical conductivity. As reported in our previous work, La substitution can effectively improve the electrical conductivity in this type of material by decreasing the band gap. In this work, we report a systematic study on the thermoelectric properties of La‐substituted GdBaCuFeO 5+δ ceramics prepared by sol–gel method and traditional solid‐state sintering.…”

Section: Introductionsupporting

confidence: 73%

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Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO_5+δ Ceramics

et al. 2015

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Gd1−xLaxBaCuFeO5+δ polycrystalline ceramics have been prepared by a sol–gel method combined with the traditional ceramic processing. Analysis of the microstructure and phase composition reveals that the pure GdBaCuFeO5+δ phase can be obtained even after the substitution of 50% La at Gd‐site. The band gap can be tuned from 1.47 to 1.36 eV by La substitution, resulting in a significant increase in the electrical conductivity. In addition, the total thermal conductivity can also be suppressed by the substitution of La at Gd‐sites. A ZT value of 0.02 at 1023 K is achieved in the 50% La‐substituted samples, which is over 20 times higher than that of the pure GdBaCuFeO5+δ sample.

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Section: Resultssupporting

confidence: 66%

Section: Introductionsupporting

confidence: 73%

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO_5+δ Ceramics

et al. 2015

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“…Isovalent doping by rare earth element La has been previously reported to largely alter the band structure of both P ‐type double peroskite‐like oxides and layered BiCuSeO, thus inducing higher electrical conductivity. Moreover, according to Pauling's electronegativity scale, the electronegativity of Bi (2.02) is much higher than that of the isovalent La (1.10).…”

Section: Introductionmentioning

confidence: 99%

Boosting the thermoelectric performance of Bi₂O₂Se by isovalent doping

Tan

Lan

et al. 2018

J Am Ceram Soc

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N‐type Bi2O2Se has a bright prospect for mid‐temperature thermoelectric applications on account of the intrinsically low thermal conductivity. However, the low carrier concentration of Bi2O2Se (~1015 cm−3) severely limits its thermoelectric performance. Herein, the boosting of the carrier concentration to ~1019 cm−3 can be realized in our La‐doped Bi2O2Se ceramic samples, which could be ascribed to the formation of isoelectronic traps and the narrowing of band gap, and contribute to a marked increase in the electrical conductivity (from 0.03 S cm−1 to 182 S cm−1). Our X‐ray absorption near‐edge structure spectra results reveal that a local disordering of oxygen atoms could be an important reason for the intrinsically low thermal conductivity of Bi2O2Se, and the point defects can also suppress the lattice thermal conductivity in La‐doped Bi2O2Se. The ZT value can be enhanced by a factor of ~4.5 to 0.35 at 823 K for Bi1.98La0.02O2Se as compared to the pristine Bi2O2Se. The coordinated optimization of electrical and thermal properties demonstrates an effective method for the rational design of high‐performance thermoelectric materials.

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Perovskite‐Type Oxides

2019

Oxide Thermoelectric Materials

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Thermoelectric properties of Sm1−xLaxBaCuFeO5 ceramics

Cited by 6 publications

References 30 publications

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO_5+δ Ceramics

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO_5+δ Ceramics

Boosting the thermoelectric performance of Bi₂O₂Se by isovalent doping

Perovskite‐Type Oxides

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Thermoelectric properties of Sm1−xLaxBaCuFeO5 ceramics

Cited by 6 publications

References 30 publications

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO5+δ Ceramics

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO5+δ Ceramics

Boosting the thermoelectric performance of Bi2O2Se by isovalent doping

Perovskite‐Type Oxides

Contact Info

Product

Resources

About

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO_5+δ Ceramics

Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO_5+δ Ceramics

Boosting the thermoelectric performance of Bi₂O₂Se by isovalent doping