Si substrates

Jang, H.W, D Ortiz, S.-H Baek, C.M Folkman, R.R Das, P Shafer, Y H Chen, C.T Nelson, X Pan, Ramamoorthy Ramesh, and C.-B Eom. "Domain engineering for enhanced ferroelectric properties of epitaxial (001) BiFeO thin films." Advanced Materials 21 (2009) 817–823.

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Ouyang, J, Ramamoorthy Ramesh, and A.L Roytburd. "Effective direct piezoelectric constants in epitaxial ferroelectric films as MEMS sensors." Materials Research Society Symposium Proceedings. Vol. 881. 2005. 125–130.