Classification and analysis of the non stoichiometry features in the layered lead and thallium cuprates

Hervieu, M.; Michel, C.; Raveau, B.

doi:10.1051/mmm:0199000105-6032700

Cited by 2 publications

(1 citation statement)

References 42 publications

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“…[49][50][51] The [Bi 2 LnO 4 ] + layers could be described as [M 3 O 4 ] + , the double of fluorite-like [La 2 O 2 ] 2+ layers which also exist in La 2 O 2 S, or described as Ln 3+ sandwiched between two BiO fluorite layers by square prismatic coordination, which is commonly observed in copper oxide superconductors such as Tl 2 Ba 2 Ca 2 Cu 3 O 10 . [52,53] Interestingly, Bi 2 LnO 4 Cu 2 Se 2 could be regarded as two units of BiCuSeO connected each other along c axis by [Bi 2 LnO 4 ] + layers.…”

Section: Introductionmentioning

confidence: 99%

Seeking New Layered Oxyselenides with Promising Thermoelectric Performance

Yang

Han

Zhou

et al. 2022

Adv Funct Materials

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Layered oxyselenides have been widely investigated as promising thermoelectric materials due to their unique merits such as super‐lattice structural features and intrinsic complexity, which contributes to low thermal conductivity and easily controllable electrical properties. Newly developed Bi2LnO4Cu2Se2 (Ln stands for lanthanide) oxyselenides are found to be potential thermoelectric systems since they have excellent electrical conductivity over 103 S cm−1. In this work, unique energy and time‐saving method combined self‐propagating high‐temperature synthesis (SHS) with spark plasma sintering (SPS) is adopted to successfully prepare a highly pure Bi2LnO4Cu2Se2 instead of a traditional solid‐state reaction. To explore the most suitable lanthanide for Bi2LnO4Cu2Se2, thermoelectric performance in a wide temperature range (300 to 923 K) of Bi2LnO4Cu2Se2 (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, and Er) is deeply evaluated and studied. Ultimately, with a relatively high electrical conductivity, moderate Seebeck coefficient, and extremely low thermal conductivity, a maximum ZT value of ≈0.27 at 923K is achieved in Bi2DyO4Cu2Se2, which is 4 times larger than that of the ever‐reported Bi2YO4Cu2Se2 and proves a potential thermoelectric system for further investigation. This work may provide some enlightenment and broaden the horizon in finding new thermoelectric materials, especially for complex layered compounds.

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