Low-temperature thermoelectric and magnetic characteristics of Ca 2.9Bi0.1Co4-xFexO 9+δ (0 ≤ x ≤ 0.10)

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effect of Fe ion doping on the low-temperature thermoelectric and magnetic properties of Ca2.9Bi0.1Co4-xFe xO9+δ (x = 0.00, 0.025, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis. The X-ray diffraction patterns revealed that all the samples are single phase. The electrical resistivity results indicated that all the samples obey the variable range hopping in the low temperature regime. The TO (transition temperature from Fermi liquid metal to incoherent metal) was increased and the slope of A value (Fermi-liquid transport coefficient) was decreased with increasing Fe content. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity, thermopower and total thermal conductivity were decreased with increasing Fe content. Among the doped samples, Ca2.95Bi0.10Co3.90Fe0.10O 9+δ had the highest dimensionless figure of merit of 0.056 at 300 K. Magnetic measurements indicated that all the samples exhibit a low-spin state of cobalt ion. The effective magnetic moments were decreased with increasing Fe content.

Original languageEnglish
Pages (from-to)778-784
Number of pages7
JournalJournal of Materials Science: Materials in Electronics
Volume25
Issue number2
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

Fermi liquids
Thermoelectric power
Ions
Magnetic variables measurement
Cobalt
Magnetic moments
Liquid metals
Temperature
Diffraction patterns
Superconducting transition temperature
Thermal conductivity
Magnetic properties
Metals
Doping (additives)
X ray diffraction
electrical resistivity
liquid metals
figure of merit
magnetic measurement
ions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

@article{e5aec72f3dca4c0cad0dfae7235966d1,
title = "Low-temperature thermoelectric and magnetic characteristics of Ca 2.9Bi0.1Co4-xFexO 9+δ (0 ≤ x ≤ 0.10)",
abstract = "The effect of Fe ion doping on the low-temperature thermoelectric and magnetic properties of Ca2.9Bi0.1Co4-xFe xO9+δ (x = 0.00, 0.025, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis. The X-ray diffraction patterns revealed that all the samples are single phase. The electrical resistivity results indicated that all the samples obey the variable range hopping in the low temperature regime. The TO (transition temperature from Fermi liquid metal to incoherent metal) was increased and the slope of A value (Fermi-liquid transport coefficient) was decreased with increasing Fe content. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity, thermopower and total thermal conductivity were decreased with increasing Fe content. Among the doped samples, Ca2.95Bi0.10Co3.90Fe0.10O 9+δ had the highest dimensionless figure of merit of 0.056 at 300 K. Magnetic measurements indicated that all the samples exhibit a low-spin state of cobalt ion. The effective magnetic moments were decreased with increasing Fe content.",
author = "Ankam Bhaskar and Lin, {Z. R.} and Liu, {Chia Jyi}",
year = "2014",
month = "2",
day = "1",
doi = "10.1007/s10854-013-1645-9",
language = "English",
volume = "25",
pages = "778--784",
journal = "Journal of Materials Science: Materials in Electronics",
issn = "0957-4522",
publisher = "Springer New York",
number = "2",

}

Low-temperature thermoelectric and magnetic characteristics of Ca 2.9Bi0.1Co4-xFexO 9+δ (0 ≤ x ≤ 0.10). / Bhaskar, Ankam; Lin, Z. R.; Liu, Chia Jyi.

In: Journal of Materials Science: Materials in Electronics, Vol. 25, No. 2, 01.02.2014, p. 778-784.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Low-temperature thermoelectric and magnetic characteristics of Ca 2.9Bi0.1Co4-xFexO 9+δ (0 ≤ x ≤ 0.10)

AU - Bhaskar, Ankam

AU - Lin, Z. R.

AU - Liu, Chia Jyi

PY - 2014/2/1

Y1 - 2014/2/1

N2 - The effect of Fe ion doping on the low-temperature thermoelectric and magnetic properties of Ca2.9Bi0.1Co4-xFe xO9+δ (x = 0.00, 0.025, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis. The X-ray diffraction patterns revealed that all the samples are single phase. The electrical resistivity results indicated that all the samples obey the variable range hopping in the low temperature regime. The TO (transition temperature from Fermi liquid metal to incoherent metal) was increased and the slope of A value (Fermi-liquid transport coefficient) was decreased with increasing Fe content. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity, thermopower and total thermal conductivity were decreased with increasing Fe content. Among the doped samples, Ca2.95Bi0.10Co3.90Fe0.10O 9+δ had the highest dimensionless figure of merit of 0.056 at 300 K. Magnetic measurements indicated that all the samples exhibit a low-spin state of cobalt ion. The effective magnetic moments were decreased with increasing Fe content.

AB - The effect of Fe ion doping on the low-temperature thermoelectric and magnetic properties of Ca2.9Bi0.1Co4-xFe xO9+δ (x = 0.00, 0.025, 0.05 and 0.10) have been investigated. The samples were prepared by conventional solid-state synthesis. The X-ray diffraction patterns revealed that all the samples are single phase. The electrical resistivity results indicated that all the samples obey the variable range hopping in the low temperature regime. The TO (transition temperature from Fermi liquid metal to incoherent metal) was increased and the slope of A value (Fermi-liquid transport coefficient) was decreased with increasing Fe content. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity, thermopower and total thermal conductivity were decreased with increasing Fe content. Among the doped samples, Ca2.95Bi0.10Co3.90Fe0.10O 9+δ had the highest dimensionless figure of merit of 0.056 at 300 K. Magnetic measurements indicated that all the samples exhibit a low-spin state of cobalt ion. The effective magnetic moments were decreased with increasing Fe content.

UR - http://www.scopus.com/inward/record.url?scp=84894073427&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894073427&partnerID=8YFLogxK

U2 - 10.1007/s10854-013-1645-9

DO - 10.1007/s10854-013-1645-9

M3 - Article

AN - SCOPUS:84894073427

VL - 25

SP - 778

EP - 784

JO - Journal of Materials Science: Materials in Electronics

JF - Journal of Materials Science: Materials in Electronics

SN - 0957-4522

IS - 2

ER -