Determination of HgCdTe elasto-plastic properties using nanoindentation

Depth sensing indentation has been used to investigate the elasto-plastic behavior of Hg^sub 0.7^Cd^sub 0.3^Te prepared by molecular beam epitaxy, liquid phase epitaxy, as well as of bulk Hg^sub 0.7^Cd^sub 0.3^Te prepared by the modified Bridgman method. It was found that Hg^sub 0.7^Cd^sub 0.3^Te wa...

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Bibliographic Details
Published in:Journal of electronic materials 2006-06, Vol.35 (6), p.1197-1205
Main Authors: MARTYNIUK, M, SEWELL, R. H, MUSCA, C. A, DELL, J. M, FARAONE, L
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystal lattices
Defects and impurities in crystals
microstructure
Elasticity
Exact sciences and technology
Experiments
Linear defects: dislocations, disclinations
Load
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Mercury cadmium telluride epitaxy
Microelectromechanical systems
Physics
Plastic deformation
Samples
Structure of solids and liquids
crystallography
Studies
Surface roughness
Thin films
Tribology and hardness
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Summary:Depth sensing indentation has been used to investigate the elasto-plastic behavior of Hg^sub 0.7^Cd^sub 0.3^Te prepared by molecular beam epitaxy, liquid phase epitaxy, as well as of bulk Hg^sub 0.7^Cd^sub 0.3^Te prepared by the modified Bridgman method. It was found that Hg^sub 0.7^Cd^sub 0.3^Te was characterized by a modulus of elasticity of E^sub avg ~ 50 GPa and hardness of H^sub avg^ ~ 0.66 GPa, independent of growth technology. The measured hardness was observed to increase with decreasing size of indentation owing to the nucleation of dislocations within the plastic zone. The elasto-plastic response of the samples to nanoindentation was observed to be purely elastic at low indentation depths and developed into ~10% elastic and ~90% plastic response, with an increase in penetration contact depth to above 100 nm exhibiting significant amounts of creep. The transition from purely elastic to elasto-plastic behavior has been observed to be marked by discontinuities, or "pop-in" events in the indenter load-penetration curves, with the indentation zone maximum sheer stress varying with HgCdTe growth method in the range 1.1 - 1.8 GPa. This onset and subsequent flow of plasticity is postulated to be associated with the spontaneous nucleation and propagation of dislocations. [PUBLICATION ABSTRACT]
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-006-0241-7