Microstructure and mechanical properties of Li0.33La0.567TiO3
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Mechanical properties of conventional sintered Li0.33La0.567TiO3 (LLTO) are presented with focus on the correlation with the microstructural appearance. Variation in density, grain size, and second phase are achieved by changing the lithium to lanthanum ratio and sintering conditions. All samples show varying amounts of a second phase which is identified as TiO2. These inert particles have no effect on the measured mechanical properties. In contrast, a high sensitivity to changes in the microstructural evolution is found. Therefore, density and grain size are the important microstructural features to control both electrical and mechanical properties. For stoichiometric, a dense LLTO a Young’s modulus of 200 GPa, K IC of 1.2 MPam0.5, and a Vickers hardness of 8.4 GPa are measured. For all dense samples, the characteristic bending strength shows values around 150 MPa and Weibull modulus of m = 7–9. Deviations from these results are explained by microstructural events like second phases, density, or grain size.
The authors thank Mr. Jakob Rohmer for his assistance in processing and characterization of the materials.
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Conflict of interest
The authors declare that they have no conflict of interest.
- 11.Chiang Y, Birnie DP, Kingery WD (1997) Physical ceramics. Wiley, New YorkGoogle Scholar
- 15.Rohmer J (2015) Herstellung und mechanische Charakterisierung von Lithium–Lanthan–Titanat. Karlsruhe Institute of Technology, KarlsruheGoogle Scholar
- 16.DIN EN 843-2:2007-03 (2007) Advanced technical ceramics - Mechanical properties of monolithic ceramics at room temperature - Part 2: Determination of Young’s modulus, shear modulus; German version EN 843-2:2006 and Poisson’s ratioGoogle Scholar
- 17.DIN EN 843-1:2008-08 (2008) Advanced technical ceramics - Mechanical properties of monolithic ceramics at room temperature - Part 1: Determination of flexural strength; German version EN 843-1:2006Google Scholar
- 18.DIN CEN/TS 14425-5:2004-10 (2004) Advanced technical ceramics - Test methods for determination of fracture toughness of monolitic ceramics - Part 5: Single-edge vee-notch beam (SEVNB) method; German version CEN/TS 14425-5:2004Google Scholar