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  1. Article

    Open Access

    Chemical expansion of CeO2−δ and Ce0.8Zr0.2O2−δ thin films determined by laser Doppler vibrometry at high temperatures and different oxygen partial pressures

    The chemical expansion of ceria (CeO2−δ) and ceria-zirconia (Ce0.8Zr0.2O2−δ, CZO80) thin films is investigated by high-temperature laser Doppler vibrometry (LDV) at temperatures from 600 to 950 °C. The films are ...

    Dhyan Kohlmann, Hendrik Wulfmeier, Marvin Schewe… in Journal of Materials Science (2023)

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  2. Article

    Open Access

    Comparison of the electrical conductivity of bulk and film Ce1–xZrxO2–δ in oxygen-depleted atmospheres at high temperatures

    Featuring high levels of achievable oxygen non-stoichiometry δ, Ce1−xZrxO2−δ solid solutions (CZO) are crucial for application as oxygen storage materials in, for example, automotive three-way catalytic converter...

    Iurii Kogut, Carsten Steiner, Hendrik Wulfmeier… in Journal of Materials Science (2021)

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  3. No Access

    Article

    Epitaxial Piezoelectric Langasite Thin Films for High-Temperature Application

    The homo- and heteroepitaxial deposition of LGS (langasite, La3Ga5SiO14) thin films on LGS single crystals, Si and SiO2 substrates by pulsed laser deposition (PLD) is demonstrated. PLD is performed at substrate t...

    Hendrik Wulfmeier, René Feder, Li Zhao, Holger Fritze in MRS Advances (2019)

  4. No Access

    Article

    Langasite-Type Resonant Sensors for Harsh Environments

    Operation of single crystalline Ca3TaGa3Si2O14 (CTGS) and La3Ga5SiO14 (LGS) bulk acoustic wave resonators is demonstrated up to 1270 °C and 1470 °C, respectively. The mass sensitivity of such devices is about 35 ...

    Yuriy Suhak, Michal Schulz, Hendrik Wulfmeier, Ward L. Johnson… in MRS Advances (2016)

  5. No Access

    Article

    Thermal Stability of Materials for Thin-Film Electrochemical Cells Investigated by Thin-Film Calorimetry

    Phase transformation enthalpies are determined using the recently developed measurement technique Thin-Film Calorimetry (TFC), which is based on piezoelectric resonators vibrating in thickness shear mode. They...

    Hendrik Wulfmeier, Alexander Omelcenko, Daniel Albrecht, Detlef Klimm… in MRS Advances (2016)

  6. No Access

    Article

    High-temperature thin-film calorimetry: a newly developed method applied to lithium ion battery materials

    A thin-film calorimeter has been developed to investigate the thermodynamic properties of thin films including battery layer sequences. A new approach, i.e., the application of high-temperature stable piezoele...

    Hendrik Wulfmeier, Daniel Albrecht, Svetlozar Ivanov… in Journal of Materials Science (2013)

  7. No Access

    Article

    Synthesis of Different Molybdenum Disulfide Nanostructures and their Applicability in Lithium Ion Batteries with Ionic Liquid Electrolytes

    Molybdenum disulfide (MoS2) nanostructures with three different morphologies are synthesized and tested with respect to their applicability in lithium ion batteries. Thereby, electrolytes based on ionic liquids a...

    Daniel Albrecht, Hendrik Wulfmeier, Svetlozar Ivanov… in MRS Online Proceedings Library (2013)

  8. No Access

    Article

    Thin Film Calorimetry - Device Development and Application to Lithium Ion Battery Materials

    The work takes advantage of a newly developed measurement system which enables to investigate the thermodynamic properties of thin films including battery layer sequences. This technique, Thin-Film Calorimetry...

    Hendrik Wulfmeier, Daniel Albrecht, Svetlozar Ivanov… in MRS Online Proceedings Library (2013)