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Nanomechanics of minerals: understandings and developments through instrumented nanoindentation techniques

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Abstract

Understanding the dynamics of the lithosphere relies heavily on the scale-dependent rheology of minerals. While quartz, feldspar, and phyllosilicates are the key phases to govern the rheology of the crust and tectonic margins, olivine and other mafic phases control the same in the upper mantle. Phase transition, solid-state substitution, polymorphism, etc. also affect mineral phase rheology. High pressure–temperature deformation tests with natural, synthetic and analog materials have improved our interpretation of the geodynamic state of the lithosphere. However, deforming and studying a single crystal is not easy, because of the scarcity of specimens and laborious sample preparations. Experimental micro- to nanoindentation at room and/or elevated temperatures has proven to be a convenient method over mesoscale compressive testing. Micro- to nanoindentation technique enables higher precision, faster data acquisition and ultra-high resolution (nanoscale) load and displacement. Hardness, elastic moduli, yield stress, fracture toughness, fracture surface energy and rate-dependent creep of mono- or polycrystalline minerals are evaluated using this technique. Here, we present a comprehensive assessment of micro- to nano-mechanics of minerals. We first cover the fundamental theories of instrumented indentation, experimental procedures, pre- and post-indentation interpretations using various existing models followed by a detailed discussion on the application of nanoindentation in understanding the rheology and deformation mechanisms of various minerals commonly occur in the crust and upper mantle. We also address some of the major limitations of indentation tests (e.g., indentation size effect). Finally, we suggest potential future research areas in mineral rheology using instrumented indentation.

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Acknowledgements

This manuscript benefited greatly from the editorial guardianship of Larissa Dobrzhinetskaya and enriching reviews from two anonymous reviewers. RM acknowledges a junior research fellowship from IIT Kanpur and a Prime Minister’s Research Fellowship from the Ministry of Education, Government of India. This work is a part of a Swarnajayanti Fellowship (DST/SJF/E&ASA-01/2015-16) awarded to SM by the Department of Science and Technology, Government of India.

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This work is a part of a Swarnajayanti Fellowship (DST/SJF/E&ASA-01/2015–16) awarded to SM.

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RM and SM conceptualized the work. RM prepared the draft manuscript. RM and SM reviewed the manuscript and finalized it for submission.

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Correspondence to Santanu Misra.

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We have no relevant financial or non-financial interests to disclose. We have no conflicts of interest to declare that are relevant to the content of this article. We certify that we have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. We have no financial or proprietary interest in any material discussed in this article.

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Mukherjee, R., Misra, S. Nanomechanics of minerals: understandings and developments through instrumented nanoindentation techniques. Phys Chem Minerals 50, 10 (2023). https://doi.org/10.1007/s00269-023-01235-8

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  • DOI: https://doi.org/10.1007/s00269-023-01235-8

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