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Internal Friction in ZrO2 Containing CaO.

J B Wachtman, W C Corwin

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    This summary is machine-generated.

    Internal friction in calcia stabilized zirconia (CSZ) reveals distinct peaks related to CaO content. Oxygen vacancy mobility is key, with annealing affecting peak height and composition dependence.

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    Area of Science:

    • Materials Science
    • Solid State Physics
    • Ceramic Engineering

    Background:

    • Zirconium dioxide (ZrO2) stabilized with calcium oxide (CaO) is a crucial ceramic material.
    • Understanding internal friction in calcia stabilized zirconia (CSZ) is vital for its mechanical and electrical applications.
    • Previous studies have linked electrical resistivity to oxygen vacancy behavior in CSZ.

    Purpose of the Study:

    • To investigate the effect of varying CaO content on the internal friction of polycrystalline ZrO2.
    • To characterize the nature of internal friction peaks and their relationship to microstructural features and oxygen vacancies.
    • To examine the impact of high-temperature annealing on internal friction properties.

    Main Methods:

    • Internal friction measurements were performed on CSZ samples with CaO concentrations ranging from 4 to 20 mole percent.
    • Experiments were conducted at a frequency of 1 kHz, with temperature scans to identify friction peaks.
    • Samples were subjected to annealing at 1000 °C for 1000 hours to study microstructural evolution effects.

    Main Results:

    • A symmetrical internal friction peak was observed between 10-20% CaO, peaking around 300 °C at 1 kHz.
    • Below 10% CaO, a non-symmetrical peak appeared at higher temperatures, possibly indicating a two-phase structure.
    • Annealing reduced peak height, showing a different composition dependence compared to electrical resistivity annealing results.

    Conclusions:

    • Oxygen vacancies in CSZ likely exist in multiple binding states, influencing internal friction.
    • The symmetrical peak is attributed to oxygen vacancy motion, correlating with electrical resistivity data.
    • Complex models are needed to fully describe the behavior of oxygen vacancies in CSZ.