Large piezoresistivity phenomenon in SiCN-(La,Sr) MnO3 composites

Makarand Karmarkar, Gurpreet Singh, Sandeep Shah, Roop L. Mahajan, Shashank Priya

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Abstract

We present the results on SiCN- (La,Sr) MnO3 (LSMO) composites correlating the observed large piezoresistance behavior with the microstructural features and defect chemistry. Scanning electron microscopy characterization revealed the presence of self-assembled periodic microvalleys in the microstructure with width of 1-5 μm and depth of 600-1000 nm. The microvalleys act as stress concentration points providing change in volume with applied stress. High resolution transmission electron microscopy measurements conducted on composites showed that LSMO grains consist of SiCN phase but no inclusions were observed.

Original languageEnglish (US)
Article number072902
JournalApplied Physics Letters
Volume94
Issue number7
DOIs
StatePublished - 2009
Externally publishedYes

Bibliographical note

Funding Information:
G. Singh would like to thank D. Ahn at the University of Colorado for useful discussions on SiCN composites. Thanks are also due to instrument specialists at the Nano Characterization and Fabrication Laboratory (NCFL) and ESM. The authors (M.K. and S.P.) would like to acknowledge financial support from the Office of Naval Research (Grant No. N00014-08-1-0654)

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