Growth of yttria-doped zirconium oxide nitride single crystals by means of reactive skull melting

Berendts, Stefan; Lerch, Martin

doi:10.1016/j.jcrysgro.2011.09.048

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…The single crystals were grown in the group of Martin Lerch at the Berlin University of Technology using a skull melting technique as reported for zirconia-and ceria-based oxides. [22][23][24] For the electrode preparation the crystals, which were of sizes lower than 2 mm Â 2 mm, were cut into slices of 750 mm thickness. Due to the small size of the slices a further step of embedding was needed for handling reasons.…”

Section: Methodsmentioning

confidence: 99%

Platinum microelectrodes on gadolinia doped ceria single crystals – bulk properties and electrode kinetics

Neumeier

Elm

Luerßen

et al. 2018

Phys. Chem. Chem. Phys.

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To better understand the electrode kinetics of oxygen reduction and oxidation of gadolinia doped ceria (GDC), the electrochemical properties of platinum electrodes on GDC single crystals and polycrystalline samples were investigated with geometrically well-defined microelectrodes. For comparison measurements were also performed on polycrystalline samples using platinum interdigital electrodes in order to access the effect of the electrode geometry on the electrochemical properties. The transport properties were characterised using impedance spectroscopy, allowing to separate the transport processes of the electrode and the electrolyte. Evaluation of the temperature dependence shows activation energies of 0.77 eV for bulk transport and 1.03 eV for the electrode exchange. Oxygen partial pressure dependent measurements in a reducing atmosphere reveal a strong increase in activation energy due to electronic defect formation. A distinct chemical capacitance is observed in the electrode impedance for all sample types independent of the electrode geometry. While this chemical capacitance is only visible in the electrolyte contribution for the samples measured with interdigital electrodes, for the samples investigated with microelectrodes no chemical capacitance is observed in the electrolyte contribution of the impedance. As the chemical capacitance is related to stoichiometry changes in the electrolyte materials, the results confirm the non-uniform potential distribution occurring at a microelectrode, which results in a vanishing lateral potential gradient and therefore in a negligible stoichiometry gradient inside the electrolyte at a distance from the microelectrode.

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Section: Methodsmentioning

confidence: 99%

Platinum microelectrodes on gadolinia doped ceria single crystals – bulk properties and electrode kinetics

Neumeier

Elm

Luerßen

et al. 2018

Phys. Chem. Chem. Phys.

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“…A 10 mol% CGO single crystal (CGO20) was grown using the skull melting technique. Details are reported for zirconia and ceria in other papers [24][25][26][27] . The sample selected for the test was 4 x 4 x 0.7 mm thick, with gold electrodes sputtered on two opposite faces normal to the [111] direction.…”

Section: Experimental Single Crystal Synthesismentioning

confidence: 99%

Electromechanically active pair dynamics in a Gd-doped ceria single crystal

Santucci

Zhang

Kabir

et al. 2021

Phys. Chem. Chem. Phys.

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“…Cubic zirconia is an important semiconductor and crystalline material with high processing accuracy, high oxygen ion conductivity and other physicochemical properties leading to a wide range of applications in the field of optoelectronics, such as fuel cells, oxygen sensors and fibre optic connectors. [1][2][3][4][5] In nature, zirconia exists in the monoclinic phase. Zirconia undergoes a phase transition from monoclinic to tetragonal at 1170 °C and from tetragonal to cubic at 2370 °C.…”

Section: Introductionmentioning

confidence: 99%