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 language | English |
|---|---|
| Pages (from-to) | 778-784 |
| Number of pages | 7 |
| Journal | Journal of Materials Science: Materials in Electronics |
| Volume | 25 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2014 Feb 1 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering
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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 journal › Article
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 -