To warrant long-term reliability for application of electrolytes in solid state batteries also mechanical properties have to be considered. Current work concentrates on Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP), which based on its conductivity is a very promising material. Effect of sintering temperature (950, 1000, 1050, 1100 °C) on mechanical properties and conductivity was tested.Impedance tests were carried out and as main focus of the work the mechanical behavior of LATP samples was determined. The impedance tests results revealed that LATP sintered at 1100 °C had the highest ion conductivity. The LATP sintered at 1100 °C revealed also the highest elastic modulus and hardness, which appeared to be related mainly to a smaller lattice *
Al/Y-substituted NASICON solid electrolytes are promising for novel solid state batteries. The solid solutions Na1+2xAlxYxZr2-2x(PO4)3 (NAYZPx) and Na3+2xAlxYxZr2-2x(SiO4)2(PO4) (NAYZSiPx) that crystallize in this structure are characterized by depth-sensitive indentation technique to determine their micro-mechanical properties. NAYZPx is rhombohedral, whereas NAYZSiPx changes from monoclinic to rhombohedral phase depending on substitutional level and temperature. For rhombohedral NAYZPx elastic moduli are in the range ~ 72 to 82 GPa and hardness values are in the range ~ 4.8 to 5.8 GPa, whereas for NAYZSiPx the elastic moduli are with the range ~ 72 to 88 GPa and hardness ~ 5.6 to 7.6 GPa, respectively. The fracture toughness values for both systems, as determined by Vickers indentation, are rather independent of the applied load being with the range 1.30 to 1.58 MPa•m 0.5 . Cracks typically show a mixed intergranular/transgranular crack mode.
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