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Influence of solid-state-synthesis conditions on properties of oxide thermoelectric materials

  • Calcium cobaltite and calcium manganate are promising oxide thermoelectric materials for applications between 600 °C and 900 °C in air to convert waste heat directly into electrical power. The solid state reaction, well known for large scale powder synthesis of functional materials, is used for the production of thermoelectric oxides. As a high temperature process, the powder synthesis consumes a lot of energy. In different studies, different synthesis conditions were used for the preparation of calcium cobaltite and calcium manganate powder. To the author’s knowledge, a systematic study of the synthesis conditions of calcium cobaltite and calcium manganate has not yet been published. Therefore, the synthesis conditions for calcium cobaltite (temperature, dwell time, and particle size of raw materials) were studied with a statistical design of experiments (2³) and investigated regarding phase composition (XRD), densification and thermoelectric properties. The gained knowledge was usedCalcium cobaltite and calcium manganate are promising oxide thermoelectric materials for applications between 600 °C and 900 °C in air to convert waste heat directly into electrical power. The solid state reaction, well known for large scale powder synthesis of functional materials, is used for the production of thermoelectric oxides. As a high temperature process, the powder synthesis consumes a lot of energy. In different studies, different synthesis conditions were used for the preparation of calcium cobaltite and calcium manganate powder. To the author’s knowledge, a systematic study of the synthesis conditions of calcium cobaltite and calcium manganate has not yet been published. Therefore, the synthesis conditions for calcium cobaltite (temperature, dwell time, and particle size of raw materials) were studied with a statistical design of experiments (2³) and investigated regarding phase composition (XRD), densification and thermoelectric properties. The gained knowledge was used to optimize the solid state reaction of calcium manganate. This study showed that a higher energy input (elevated temperatures, longer dwell times, or repeated calcinations) during powder synthesis does not improve but deteriorate the thermoelectric properties of calcium cobaltite. The same correlation was determined for the densification. As a higher energy input during powder synthesis leads to a larger grain size and therefore to a reduced sinter activity the densification at a given sinter profile is minimize as well as the thermoelectric properties. These results can be used to minimize the energy demand for the powder synthesis of oxide thermoelectric materials.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Sophie Bresch
Koautoren/innen:Björn Mieller, Torsten Rabe
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
Organisationseinheit der BAM:5 Werkstofftechnik
5 Werkstofftechnik / 5.5 Technische Keramik
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Calcium cobaltite; Calcium maganate; Solid-state-reaction; Thermoelectrics
Themenfelder/Aktivitätsfelder der BAM:Energie
Material
Material / Materialien und Stoffe
Veranstaltung:92. DKG Jahrestagung & Symposium Hochleistungskeramik 2017
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:19.03.2017
Enddatum der Veranstaltung:22.03.2017
Verfügbarkeit des Volltexts:Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:24.03.2017
Referierte Publikation:Nein