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Optimization of sintering process and enhanced hybrid improper ferroelectricity of Ca3Ti2O7 ceramics fabricated by an acetic acid sol–gel method.
- Source :
- Journal of Materials Science: Materials in Electronics; Oct2021, Vol. 32 Issue 19, p24328-24341, 14p
- Publication Year :
- 2021
-
Abstract
- The Ca<subscript>3</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript> materials exhibit hybrid improper ferroelectricity due to the rotation and tilt coupling of TiO<subscript>6</subscript> octahedron. However, the lower remnant polarization of Ca<subscript>3</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript> ceramics obtained by conventional solid-state method limits its practical application. Herein, the single-phase Ca<subscript>3</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript> ceramics with enhanced ferroelectricity were synthesized using an acetic acid sol–gel method and two-stage sintering. The sintering process does not significantly change the distortion amplitude of TiO<subscript>6</subscript> octahedron in Ca<subscript>3</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript> ceramics but has a greater impact on the grain size and the concentration of oxygen vacancy. The synergistic effects of grain size and oxygen vacancy have been achieved in the Ca<subscript>3</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript> ceramics prepared by the optimal sintering process (1400 °C/12 h − 1550 °C/18 h), which leads to its enhanced hybrid ferroelectricity (P<subscript>r</subscript> = 1.34 μC/cm<superscript>2</superscript> and E<subscript>C</subscript> = 120 kV/cm). These findings demonstrate that the sol–gel method is an effective approach to obtain the Ca<subscript>3</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript> materials with enhanced hybrid improper ferroelectricity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 32
- Issue :
- 19
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 152744902
- Full Text :
- https://doi.org/10.1007/s10854-021-06902-6