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Author: Yvonne Gerbig

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1. Raman spectroscopy-enhanced IIT: In situ analysis of mechanically stressed polycrystalline Si thin films
Published: 7/8/2014
Authors: Yvonne Beatrice Gerbig, Chris A Michaels, Robert Francis Cook
Abstract: Exposed to mechanical stress, semiconductor materials may phase transform, resulting in changes of crystallographic structure and material properties, rather than deform by plastic flow. As a consequence, prediction of the state and distribution of s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915665

2. Accurate Spring Constant Calibration for very Stiff Atomic Force Microscopy Cantilevers
Published: 11/26/2013
Authors: Scott Grutzik, Richard Swift Gates, Yvonne Beatrice Gerbig, Douglas T Smith, Robert Francis Cook, Alan Zehnder
Abstract: There are many atomic force microscopy (AFM) applications that rely on quantifying the force between the AFM cantilever tip and the sample. The AFM does not explicitly measure force, however, so in such cases knowledge of the cantilever stiffness ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912481

3. Indentation device for in situ Raman spectroscopic and optical studies
Published: 12/12/2012
Authors: Yvonne Beatrice Gerbig, Chris A Michaels, Aaron M Forster, John W Hettenhouser, Walter Eric Byrd, Dylan J. Morris, Robert Francis Cook
Abstract: Instrumented indentation is a widely used technique to study the mechanical behavior of materials at small length scales and thus has been exploited in particular for metals, ceramics, glasses, and polymers. Mechanical tests of bulk materials, micros ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911470

4. THE ROLE OF TOOTH ENAMEL MECHANICAL PROPERTIES IN PRIMATE DIETARY ADAPTATION
Published: 6/27/2012
Authors: Paul Constantino, James J. Lee, Yvonne Beatrice Gerbig, Adam Hartstone-Rose, Mauricio Talebi, Brian Ronald Lawn, Peter Lucas
Abstract: Primate teeth adapt to the physical properties of foods in a variety of ways including changes in occlusal morphology, enamel thickness, and overall size. We conducted a comparative study of extant primates to examine whether their teeth also adap ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907407

5. High Confidence Level Calibration for AFM Based Fracture Testing of Nanobeams
Published: 6/11/2012
Authors: Scott Grutzik, Richard Swift Gates, Yvonne Beatrice Gerbig, Robert Francis Cook, Melissa Hines, Alan Zehnder
Abstract: When designing micro- or nanoelectromechanical systems, (MEMS and NEMS), it is important to consider whether structural elements will withstand loads experienced during operation. Fracture behavior at length scales present in MEMS and NEMS is much di ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911026

6. In situ observation of the indentation-induced phase transformation of silicon thin films
Published: 3/5/2012
Authors: Yvonne Beatrice Gerbig, Chris A Michaels, Aaron M Forster, Robert Francis Cook
Abstract: Indentation-induced phase transformation processes were studied by in situ Raman microspectroscopy of the deformed contact region of silicon on sapphire samples during contact loading and unloading. During loading, the formation of Si-II and another ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910047

7. Direct observation of phase transformation anisotropy in indented silicon using confocal Raman microscopy
Published: 5/31/2011
Authors: Yvonne Beatrice Gerbig, Stephan J Stranick, Robert Francis Cook
Abstract: The theoretically-predicted anisotropic nature of the indentation phase transformation in silicon (Si) is observed directly in experiments using hyperspectral, confocal Raman microscopy. The anisotropy is reflected in the two-dimensional distribution ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906105

8. Improving Fatigue Strength of Alumina through Surface Grading
Published: 5/9/2011
Authors: Yvonne Beatrice Gerbig, Linlin Ren, Lela Liu, Sanjit Bhowmick, Malvin Janal, Van Thompson, Yu Zhang
Abstract: Porcelain veneered alumina crown restorations often fail from bulk fracture resulting from radial cracks that initiate at the cementation surface with repeated flexure of the stiffer crown layers on the soft dentin support. We hypothesize that bulk f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907566

9. Measurement of residual stress field anisotropy at indentations in silicon
Published: 6/23/2010
Authors: Yvonne Beatrice Gerbig, Stephan J Stranick, Robert Francis Cook
Abstract: The residual stress field around spherical indentations on single crystal silicon (Si) of different crystallographic orientation is mapped by confocal Raman microscopy. All orientations exhibit an anisotropic stress pattern with an orientation spec ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905445

10. Stress-Intensity Factor and Toughness Measurement at the Nanoscale using Confocal Raman Microscopy
Published: 7/12/2009
Authors: Robert Francis Cook, Yvonne Beatrice Gerbig, Mark D Vaudin, Jeroen Schoenmaker, Stephan J Stranick
Abstract: A confocal Raman microscopy technique is presented that allows stress measurement at the nanoscale, which in turn enables measurement of stress-intensity factors (SIF) at crack tips and thus toughness to be estimated. Peak-fitting and super-resolutio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900910



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