Room Temperature Elastic Moduli and Vickers Hardness of Hot-Pressed LLZO Cubic Garnet

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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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2012
Accession Number
ADA577816

Entities

People

  • Eldon D. Case
  • Ezhiyl Rangasamy
  • Jeffrey B. Wolfenstine
  • Jeffrey S. Sakamoto
  • Jennifer E. Ni

Organizations

  • Michigan State University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Aluminum Oxides
  • Bulk Modulus
  • Ceramic Materials
  • Chemistry
  • Crystal Structure
  • Diffraction
  • Geometry
  • Grain Size
  • Materials
  • Materials Science
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Modulus Of Elasticity
  • Shear Modulus
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Battery Technology and Engineering
  • Metallurgy
  • Structural Dynamics.