Abstract
Relying on nanoindentation technology, the room-temperature creep behavior of a LiTaO3 single crystal in the typical orientation (012), i.e., Y-42° plane was investigated. Three kinds of spherical tips with the radii of 0.76, 2.95 and 9.8 μm were respectively applied to detect nanoindentation length scale effect on creep deformation at both elastic and plastic regions. Superficially, both creep displacement and rate were nearly linearly increased with increasing holding depth and independent of tip size, which could be ascribed to the simultaneously enlarged holding strain and deformation volume beneath the indenter. At a similar holding strain, creep deformation, i.e., creep strain and strain rate were more pronounced under smaller spherical tips. Strain rate sensitivities of creep flows under different spherical tips and holding strains were also estimated. The potential room-temperature creep mechanism of LiTaO3 under high shear compression stress was discussed.
Highlights
As a typical multi-functional material, Lithium tantalite (LiTaO3 or LT) exhibits excellent and unique characteristics, e.g., optical, piezoelectric and ferroelectric properties
We and investigated room‐temperature creep behaviorasand its correlation with novelty of this work the creepthe features of LiTaO3 can be highlighted follows: nanoindentation size effect of a LiTaO3 single crystal
(2) Nanoindentation creep several displacement and rate during theasholding observed experimental results, conclusions can be drawn, below: stage were insufficient to represent the creep resistance of a material, because these were comprehensive mechanical
Summary
As a typical multi-functional material, Lithium tantalite (LiTaO3 or LT) exhibits excellent and unique characteristics, e.g., optical, piezoelectric and ferroelectric properties. From the perspective of deformation manner, LiTaO3 is classified as a typical kind of soft-brittle material with low fracture toughness of about. Cracks are prone to generate on LiTaO3 surface, inducing catastrophic fracture during precision machining like grinding, lapping or polishing. The risk of catastrophic breakage of LiTaO3 would be higher when decreasing its thickness by machining to meet application requirements. Micro/nano mechanical investigations on the surface of thin LiTaO3 single crystals have been at the cutting edge in the use of nanoindentation technology.
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