Room temperature elastic moduli and Vickers hardness of hot-pressed LLZO cubic garnet
Room temperature elastic moduli and Vickers hardness of hot-pressed LLZO cubic garnet
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DOI：
10.1007/s10853-012-6687-5
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发表时间：
2012-12-01
影响因子：
4.5
通讯作者：
Wolfenstine, Jeffrey B.
中科院分区：
文献类型：
--
作者：
Ni, Jennifer E.;Case, Eldon D.;Wolfenstine, Jeffrey B.
立方石榴石Li6.24La3Zr2Al0.24O11.98 （LLZO）是用作锂-空气和锂- s电池电解质的候选材料。在实际设备中使用LLZO将要求LLZO在抗划伤（硬度）和足够的刚度（弹性模量）方面具有良好的机械完整性。本文采用铸锭粉末加工的方法制备了粉末。所有的试样然后通过热压致密化。采用共振超声光谱法和维氏压痕法分别测定了室温弹性模量（杨氏模量、剪切模量、体模量和泊松比）和硬度。体积分数孔隙度P的杨氏模量分别为149.8 +/- A 0.4 GPa （P = 0.03）和132.6 +/- A 0.2 GPa （P = 0.06）。平均维氏硬度为6.3 +/- A 0.3 GPa (P = 0.03), 5.2 +/- A 0.4 （P = 0.06）。
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 +/- A 0.4 GPa (P = 0.03) and 132.6 +/- A 0.2 GPa (P = 0.06). The mean Vickers hardness was 6.3 +/- A 0.3 GPa for P = 0.03 and 5.2 +/- A 0.4 for P = 0.06.