Thermoelectric and magnetic properties of Ca3Co 4-xCuxO9 + δ with x = 0.00, 0.05, 0.07, 0.10 and 0.15

Ankam Bhaskar; Z. R. Lin; Chia Jyi Liu

doi:10.1016/j.materresbull.2013.07.004

Thermoelectric and magnetic properties of Ca₃Co ₄-_xCu_xO₉ ₊ δ with x = 0.00, 0.05, 0.07, 0.10 and 0.15

Ankam Bhaskar, Z. R. Lin, Chia Jyi Liu

Department of Physics

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Ca₃Co₄-_xCu_xO₉ + a(x = 0.00, 0.05, 0.07, 0.10 and 0.15) samples were prepared by conventional solid-state synthesis and their thermoelectric properties were systematically investigated. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. Ca ₃Co_3.85Cu_0.15O₉ ₊ δ had the highest power factor of 2.17 μW cm¹ K² at 141 K, representing an improvement of about 64.4% compared to undoped Ca ₃Co₄O₉₊ δ. Magnetization measurements indicated that all the samples exhibit a low-spin state of cobalt ions. The observed effective magnetic moments decreased with increasing copper content.

Original language	English
Pages (from-to)	4884-4888
Number of pages	5
Journal	Materials Research Bulletin
Volume	48
Issue number	11
DOIs	https://doi.org/10.1016/j.materresbull.2013.07.004
Publication status	Published - 2013 Nov

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.materresbull.2013.07.004

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title = "Thermoelectric and magnetic properties of Ca3Co 4-xCuxO9 + δ with x = 0.00, 0.05, 0.07, 0.10 and 0.15",

abstract = "Ca3Co4-xCuxO9 + a(x = 0.00, 0.05, 0.07, 0.10 and 0.15) samples were prepared by conventional solid-state synthesis and their thermoelectric properties were systematically investigated. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. Ca 3Co3.85Cu0.15O9 + δ had the highest power factor of 2.17 μW cm1 K2 at 141 K, representing an improvement of about 64.4% compared to undoped Ca 3Co4O9+ δ. Magnetization measurements indicated that all the samples exhibit a low-spin state of cobalt ions. The observed effective magnetic moments decreased with increasing copper content.",

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T1 - Thermoelectric and magnetic properties of Ca3Co 4-xCuxO9 + δ with x = 0.00, 0.05, 0.07, 0.10 and 0.15

AU - Bhaskar, Ankam

AU - Lin, Z. R.

AU - Liu, Chia Jyi

PY - 2013/11

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N2 - Ca3Co4-xCuxO9 + a(x = 0.00, 0.05, 0.07, 0.10 and 0.15) samples were prepared by conventional solid-state synthesis and their thermoelectric properties were systematically investigated. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. Ca 3Co3.85Cu0.15O9 + δ had the highest power factor of 2.17 μW cm1 K2 at 141 K, representing an improvement of about 64.4% compared to undoped Ca 3Co4O9+ δ. Magnetization measurements indicated that all the samples exhibit a low-spin state of cobalt ions. The observed effective magnetic moments decreased with increasing copper content.

AB - Ca3Co4-xCuxO9 + a(x = 0.00, 0.05, 0.07, 0.10 and 0.15) samples were prepared by conventional solid-state synthesis and their thermoelectric properties were systematically investigated. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. Ca 3Co3.85Cu0.15O9 + δ had the highest power factor of 2.17 μW cm1 K2 at 141 K, representing an improvement of about 64.4% compared to undoped Ca 3Co4O9+ δ. Magnetization measurements indicated that all the samples exhibit a low-spin state of cobalt ions. The observed effective magnetic moments decreased with increasing copper content.

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