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Room temperature elastic moduli and Vickers hardness of hot-pressed LLZO cubic garnet

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Abstract

Cubic garnet Li6.24La3Zr2Al0.24O11.98 (LLZO) is a candidate material for use as an electrolyte in Li–Air and Li–S batteries. The use of LLZO in practical devices will require LLZO to have good mechanical integrity in terms of scratch resistance (hardness) and an adequate stiffness (elastic modulus). In this paper, the powders were fabricated by powder processing of cast ingots. All specimens were then densified via hot pressing. The room temperature elastic moduli (Young’s modulus, shear modulus, bulk modulus, and Poisson’s ratio) and hardness were measured by resonant ultrasound spectroscopy, and Vickers indentation, respectively. For volume fraction porosity, P, the Young’s modulus was 149.8 ± 0.4 GPa (P = 0.03) and 132.6 ± 0.2 GPa (P = 0.06). The mean Vickers hardness was 6.3 ± 0.3 GPa for P = 0.03 and 5.2 ± 0.4 for P = 0.06.

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Acknowledgements

We would like to acknowledge the financial support of the U.S. Army Research Office (ARO) and the Army Research Laboratory (ARL) under grant W911NF-10-2-0089-P00001.

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Authors and Affiliations

  1. Chemical Engineering and Materials Science Department, Michigan State University, Room 2527 Engineering Building, East Lansing, MI, 48824-1226, USA

    Jennifer E. Ni, Eldon D. Case, Jeffrey S. Sakamoto & Ezhiyl Rangasamy

  2. Army Research Laboratory, RDRL-SED-C, 2800 Powder Mill Road, Adelphi, MD, 20783, USA

    Jeffrey B. Wolfenstine

Authors
  1. Jennifer E. Ni
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  2. Eldon D. Case
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  3. Jeffrey S. Sakamoto
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  4. Ezhiyl Rangasamy
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  5. Jeffrey B. Wolfenstine
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Correspondence to Eldon D. Case.

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Ni, J.E., Case, E.D., Sakamoto, J.S. et al. Room temperature elastic moduli and Vickers hardness of hot-pressed LLZO cubic garnet. J Mater Sci 47, 7978–7985 (2012). https://doi.org/10.1007/s10853-012-6687-5

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