Shrinkage Mechanism and Phase Evolution of Fine-Grain BaTiO3 Powder Compacts Containing 10 Mol% BeO3 Prepared Via a Precursor Route

Materials Chemistry and Physics 112 (2008) 531–535

17 Pages Posted: 24 Jul 2018

See all articles by Roberto Köferstein

Roberto Köferstein

Martin Luther Universitat Halle Wittenberg

Lothar Jäger

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Mandy Zenkner

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Thomas Müller

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Hans-Peter Abicht

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Date Written: august 2, 2008

Abstract

The shrinkage mechanism of BaTiO3 powder compacts containing 10 mol% BaGeO3, synthesized by a precursor route and a conventional mixed-oxide method, are described herein. The calcination of a barium titanium germanium 1,2-ethanediolato complex precursor - [Ba(HOC2H4OH)4][Ti0.9Ge0.1(OC2H4O)3] (1) - at 730 °C leads to a nm-sized Ba(Ti0.9/Ge0.1)O3 powder (1a) (SBET = 16.9 m2/g) consisting of BaTiO3 and BaGeO3. Whereas the conventional mixed-oxide method yields a powder (2) with a specific surface area of SBET = 2.0 m2/g. Powder compacts of 1a start to shrink at 790 °C and the shrinkage rate reaches a maximum at 908 °C. Dense ceramic bodies can be obtained below the appearance of the liquid melt (1120 °C), therefore the shrinkage of 1a can be described by a solid-state sintering mechanism. Otherwise the beginning of the shrinkage of powder 2 is shifted to higher temperatures and the formation of the liquid melt is necessary to obtain dense ceramic bodies. Isothermal dilatometric investigations indicate that the initial stage of sintering is dominated by sliding processes. XRD investigations show that below a sintering temperature of 1200 °C ceramic bodies of 1a consist of tetragonal BaTiO3 and hexagonal BaGeO3, whereas temperatures above 1200 °C lead to ceramics containing orthorhombic BaGeO3, and a temperature of 1350 °C causes the formation of a Ba2TiGe2O8 phase. The phase evolution of ceramic bodies of 2 is similar to 1a, however a Ba2GeO4 phase is observed below a temperature of 1100 °C.

Suggested Citation

Köferstein, Roberto and Jäger, Lothar and Zenkner, Mandy and Müller, Thomas and Abicht, Hans-Peter, Shrinkage Mechanism and Phase Evolution of Fine-Grain BaTiO3 Powder Compacts Containing 10 Mol% BeO3 Prepared Via a Precursor Route (august 2, 2008). Materials Chemistry and Physics 112 (2008) 531–535 , Available at SSRN: https://ssrn.com/abstract=3206738

Roberto Köferstein (Contact Author)

Martin Luther Universitat Halle Wittenberg ( email )

Universitätsplatz 10
Halle (Saale), Saxony-Anhalt 06108
Germany

Lothar Jäger

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Halle (Saale), Saxony-Anhalt 06108
Germany

Mandy Zenkner

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Halle (Saale), Saxony-Anhalt 06108
Germany

Thomas Müller

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry

Emil-Abderhalden-Str. 7
Halle an der Saale
06099 Halle (Saale), DE Sachsen-Anhalt 06099
Germany

Hans-Peter Abicht

Martin Luther University of Halle-Wittenberg - Institute of Chemistry, Inorganic Chemistry ( email )

Halle (Saale), Saxony-Anhalt 06108
Germany

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