Synthesis, Structure and Electrical Properties of Donor Doped Barium Titanate Ceramics

Johannes Hofer

Research output: ThesisDoctoral Thesis

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In this work net-donor doped barium titanate ceramics were studied with impedance spectroscopy in the temperature range of 50 – 400 °C, SEM-EDX, XRD and TG-MS. A modified solid oxide route was applied to synthesize disk like ceramic samples showing a micro-scale microstructure and the PTCR-effect. PTCR-curves were measured with impedance spectroscopy, which led to a good separation of bulk-resistivities, grain boundary-resistivities and grain boundary capacitances. A variation of the DC-bias and the AC-amplitude showed the dependence of the electrical resistance of the samples on the applied electric field. Impedance spectroscopy was also applied on industrial PTCR ceramic samples. A variation of DC-bias, AC-amplitude, geometry, sinter-parameters, pO2 and reduction-oxidation experiments led to further insight to the characteristics of the material. The last part of the work dealt with the synthesis of submicron ceramic samples via a nanoscale precursor obtained by an oxalate precipitation route and low temperature calcination. This product was characterized in a temperature range of 50 – 400 °C. No PTCR-effect could be found in this oxalate-precursor product. However, the trapping energy for the Manganese dopant could be determined.
Translated title of the contributionSynthese, Struktur und Elektrische Eigenschaften von Donor Dotierten Bariumtitanat Keramiken
Original languageEnglish
  • Reichmann, Klaus, Assessor B (external), External person
  • Preis, Wolfgang, Assessor A (internal)
Publication statusPublished - 2016

Bibliographical note

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  • Donor doped barium titanate
  • Impedance spectroscopy
  • PTC-effect
  • Interfacially controlled electroceramics
  • Grain boundaries
  • Electrical properties
  • Nanosynthesis
  • Oxalate route
  • Solid oxid route

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