Thermoelectric properties of light-element-containing zintl compounds CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2)

V. Ponnambalam, Donald T. Morelli

Research output: Contribution to journalArticle

  • 6 Citations

Abstract

Light-element-containing CaAl2Si2-type Zintl phases CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2) have been synthesized by solid-state reaction. Electrical resistivity (ρ), Seebeck coefficient (α), and thermal conductivity (κ) were measured over a wide temperature (T) range (80-1000 K) to evaluate the thermoelectric potential of these materials. Below 300 K, the power factor (PF; α 2/ρ) is very small. Above 600 K, however, PF increases rapidly for all compositions because of a rapid increase of α and a simultaneous decrease of ρ. The measured large α is consistent with the wider band gap expected for these compositions. Compared with the pure compounds, larger PF values are observed for the Cu-substituted compounds; the largest observed PF is ∼0.5 mW/m K 2. The thermal conductivity is found to be rather low, despite the presence of light elements, and is in the range 1.0-1.5 W/m K at 1000 K. Because of the combination of low κ and moderate PF values, the dimensionless figure of merit ZT = α 2 T/ρκ reaches a maximum of 0.4 for CaZn1.9Cu0.1P2.

LanguageEnglish (US)
Pages1875-1880
Number of pages6
JournalJournal of Electronic Materials
Volume43
Issue number6
DOIs
StatePublished - 2014

Profile

light elements
Thermal conductivity
thermal conductivity
Seebeck coefficient
Seebeck effect
Chemical analysis
Solid state reactions
figure of merit
Energy gap
broadband
solid state
electrical resistivity
Temperature
temperature

Keywords

  • Seebeck coefficient
  • thermal conductivity
  • Thermoelectrics
  • Zintl phosphides

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

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abstract = "Light-element-containing CaAl2Si2-type Zintl phases CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2) have been synthesized by solid-state reaction. Electrical resistivity (ρ), Seebeck coefficient (α), and thermal conductivity (κ) were measured over a wide temperature (T) range (80-1000 K) to evaluate the thermoelectric potential of these materials. Below 300 K, the power factor (PF; α 2/ρ) is very small. Above 600 K, however, PF increases rapidly for all compositions because of a rapid increase of α and a simultaneous decrease of ρ. The measured large α is consistent with the wider band gap expected for these compositions. Compared with the pure compounds, larger PF values are observed for the Cu-substituted compounds; the largest observed PF is ∼0.5 mW/m K 2. The thermal conductivity is found to be rather low, despite the presence of light elements, and is in the range 1.0-1.5 W/m K at 1000 K. Because of the combination of low κ and moderate PF values, the dimensionless figure of merit ZT = α 2 T/ρκ reaches a maximum of 0.4 for CaZn1.9Cu0.1P2.",
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T1 - Thermoelectric properties of light-element-containing zintl compounds CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2)

AU - Ponnambalam,V.

AU - Morelli,Donald T.

PY - 2014

Y1 - 2014

N2 - Light-element-containing CaAl2Si2-type Zintl phases CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2) have been synthesized by solid-state reaction. Electrical resistivity (ρ), Seebeck coefficient (α), and thermal conductivity (κ) were measured over a wide temperature (T) range (80-1000 K) to evaluate the thermoelectric potential of these materials. Below 300 K, the power factor (PF; α 2/ρ) is very small. Above 600 K, however, PF increases rapidly for all compositions because of a rapid increase of α and a simultaneous decrease of ρ. The measured large α is consistent with the wider band gap expected for these compositions. Compared with the pure compounds, larger PF values are observed for the Cu-substituted compounds; the largest observed PF is ∼0.5 mW/m K 2. The thermal conductivity is found to be rather low, despite the presence of light elements, and is in the range 1.0-1.5 W/m K at 1000 K. Because of the combination of low κ and moderate PF values, the dimensionless figure of merit ZT = α 2 T/ρκ reaches a maximum of 0.4 for CaZn1.9Cu0.1P2.

AB - Light-element-containing CaAl2Si2-type Zintl phases CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2) have been synthesized by solid-state reaction. Electrical resistivity (ρ), Seebeck coefficient (α), and thermal conductivity (κ) were measured over a wide temperature (T) range (80-1000 K) to evaluate the thermoelectric potential of these materials. Below 300 K, the power factor (PF; α 2/ρ) is very small. Above 600 K, however, PF increases rapidly for all compositions because of a rapid increase of α and a simultaneous decrease of ρ. The measured large α is consistent with the wider band gap expected for these compositions. Compared with the pure compounds, larger PF values are observed for the Cu-substituted compounds; the largest observed PF is ∼0.5 mW/m K 2. The thermal conductivity is found to be rather low, despite the presence of light elements, and is in the range 1.0-1.5 W/m K at 1000 K. Because of the combination of low κ and moderate PF values, the dimensionless figure of merit ZT = α 2 T/ρκ reaches a maximum of 0.4 for CaZn1.9Cu0.1P2.

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