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

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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.

    Original languageEnglish (US)
    Pages (from-to)1875-1880
    Number of pages6
    JournalJournal of Electronic Materials
    Volume43
    Issue number6
    DOIs
    StatePublished - 2014

    Profile

    light elements
    thermal conductivity
    Joint Loose Bodies
    African horse sickness virus
    Thermal conductivity
    Chemical analysis
    Seebeck effect
    figure of merit
    broadband
    solid state
    electrical resistivity
    temperature
    Acetanilides
    Fetal Proteins
    Seebeck coefficient
    Traffic Accidents
    Energy gap
    Solid state reactions
    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.}",
    year = "2014",
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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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