Abstract
Microstructure, material constants (Young modulus E, shear modulus G, Poisson ratio v), Vickers hardness HV and fracture toughness K Ic of polycrystalline ferroelectrics Na1 - xLixNbO 3 for x ≤ 0.06 were investigated to determine their dependence on lithium concentration. It has been shown that the Young modulus decreases with the increase of lithium concentration in NaNbO 3 up to 2mol-percent. The highest variations of mechanical properties appearing for Na1 - xLixNbO 3 at 2mol-percent concentration of lithium can be related to the occurence of a morphotropic limit for this concentration. The investigations of mechanical properties resulted in the possibility to asses the usability of this material for transducers and sensors that could work under load.
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