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: Research - peer-reviewArticle

    • 4 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
    Chemical analysis
    Seebeck effect
    figure of merit
    broadband
    solid state
    electrical resistivity
    temperature
    Seebeck coefficient
    Solid state reactions
    Energy gap
    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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    title = "Thermoelectric properties of light-element-containing zintl compounds CaZn2-x Cu x P2 and CaMnZn1-x Cu x P2 (x = 0.0-0.2)",
    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.",
    keywords = "Seebeck coefficient, thermal conductivity, Thermoelectrics, Zintl phosphides",
    author = "V. Ponnambalam and Morelli, {Donald T.}",
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    TY - JOUR

    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.

    KW - Seebeck coefficient

    KW - thermal conductivity

    KW - Thermoelectrics

    KW - Zintl phosphides

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