Electric transport properties of rare earth doped YbxCa1-xMnO3 ceramics (part I: Optimization of ceramic processing) |
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Authors: | Meimanat Rahmani Christian Pithan Rainer Waser |
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Affiliation: | 1. Institut für Werkstoffe der Elektrotechnike II (IWE II), RWTH Aachen University, 52056 Aachen, Germany;2. Institut für elektronische Materialien, Peter Grünberg Institut (PGI 7), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany |
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Abstract: | A comprehensive study was performed in order to find the effect of different calcination and sintering conditions on the physical properties of calcium manganite ceramics in dependence of temperature T and partial pressure of oxygen p(O2). The eventual formation of oxygen vacancies during sintering was investigated and the results were confirmed by monitoring the release of oxygen using a ZrO2 oxygen sensor. The phase transition behavior was studied using thermogravimetric analysis (TGA) in a wide range of p(O2) ≈ 10?1 MPa down to 10-19 MPa at high temperatures accompanied by dilatometry- and XRD-measurements. Furthermore, the present study reveals for the first time a way for reducing and preventing crack formation that may occur during sintering. The present systematic research provides essential fundamental information before performing electrical measurements necessary in order to understand important factors about charge carriers and electrical transport mechanism. |
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Keywords: | Corresponding author at: Meimanat Rahmani / Institut für elektronische Materialien Peter Grünberg Institut (PGI 7) Forschungszentrum Jülich GmbH 52425 Jülich Germany Calcium manganite ceramics Solid state synthesis Vacancies Thermal analysis Crystallization |
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