Analyzing indentation behavior of LaGaO3 single crystals using sharp indenters

    Authors

    S. Pathak; S. R. Kalidindi; B. Moser; C. Klemenz;N. Orlovskaya

    Comments

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    Abbreviated Journal Title

    J. Eur. Ceram. Soc.

    Keywords

    perovskites; hardness; mechanical properties; toughness; indentation; LaGaO3; DOPED LANTHANUM GALLATE; HIGH-TEMPERATURE; PLASTIC-DEFORMATION; CHOKHRALSKII METHOD; REAL STRUCTURE; CUBE-CORNER; FRACTURE; OXIDE; EVOLUTION; HARDNESS; Materials Science, Ceramics

    Abstract

    In this work, the mechanical properties of (1 0 0) and (0 0 1) oriented LaGaO3 single crystals have been studied using sharp indenters. Vickers hardness values for both the (1 0 0) and (0 0 1) samples were found to be in the same range (similar to 8 GPa). The values for the indentation fracture toughness (KR) from Vickers indentation on the (1 0 0) samples were determined to be 0.8 +/- 0.2 MPa m(1/2). Different crack lengths, implying a strong anisotropy in the indentation fracture toughness values, were observed in the two mutually perpendicular directions in the indentations on the (0 0 1) samples. These measurements led to estimates of 0.5 +/- 0.1 and 1.3 +/- 0.3 MPa m(1/2) for the two different sets of cracks on the (0 0 1) samples. In situ nanoindentation inside the SEM using a cube-corner indenter has also been used for studying the indentation fracture response of these samples. (c) 2008 Elsevier Ltd. All rights reserved.

    Journal Title

    Journal of the European Ceramic Society

    Volume

    28

    Issue/Number

    10

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    2039

    Last Page

    2047

    WOS Identifier

    WOS:000256559600015

    ISSN

    0955-2219

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