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Micromechanical analysis of fracture and domain switching in barium titanate single crystal using cathodoluminescence piezospectroscopy
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10.1063/1.2006221
/content/aip/journal/jap/98/3/10.1063/1.2006221
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.2006221

Figures

Image of FIG. 1.
FIG. 1.

(a) CL spectrum of after deconvolution into four bands and (b) the band scheme for the observed transitions.

Image of FIG. 2.
FIG. 2.

Draft of the CL and COD measurements needed for the characterization of the PS coefficient by the indentation-crack-tip calibration method.

Image of FIG. 3.
FIG. 3.

Raman spectra collected on different crystallographic planes of single crystal: plane (a) and plane (b). The spectral line indicated with the letter “P” is a plasma line, which was used as an internal wave-number reference for calibrating the spectrometer.

Image of FIG. 4.
FIG. 4.

CL spectra averaged among 20 locations for each (a) and planes (b) and their deconvolution into four bands. Note the additional band in (b) (plotted by a broken line), which corresponds to the energy gap of .

Image of FIG. 5.
FIG. 5.

Simulation plot of stress-free spectral position as a function of intensity ratio . The experimentally observed average and maximum data scatters are shown by the broken and full lines, respectively.

Image of FIG. 6.
FIG. 6.

(Color) (a) Schematic of indentation-crack morphology on different crystallographic planes of . (b) SEM micrograph of an indentation print on the plane. (c) SEM micrograph of an indentation print on the plane.

Image of FIG. 7.
FIG. 7.

(Color) Polarized optical micrographs of (a) plane and (b) plane and the XRD patterns detected on their respective surfaces in (c) and (d), respectively.

Image of FIG. 8.
FIG. 8.

(Color) Results of XRD characterization on the cross section of the single crystal corresponding to the plane perpendicular to the plane on which 90° domains were observed: (a) schematic of the domain configuration; (b) HR-XRD intensity of (400) and (004) reflections along the cross section.

Image of FIG. 9.
FIG. 9.

COD profile of an indentation crack propagated within the (113) plane. The full line represents a least-square fitting line according to Eqs. (19) and (20). The characteristic lengths of the microcrack were and . The slope of the plot represents the stored at the tip of the microcrack.

Image of FIG. 10.
FIG. 10.

Wavelength variation at maximum of the CL spectrum of single crystal as a function of the distance ahead of a microcrack propagated within the (113) crystallographic (cleavage) plane.

Image of FIG. 11.
FIG. 11.

Procedure followed to determine the wavelength at maximum of the CL spectrum of .

Image of FIG. 12.
FIG. 12.

Results of uniaxial PS calibration on the and planes of single crystal [in (a) and (b), respectively]. Each data point is obtained from the average of 20 data collected under the same loading conditions.

Image of FIG. 13.
FIG. 13.

Variations with applied stress of FWHM and wavelength at maximum of the band components belonging to the CL spectrum of single crystal: (a) band I; (b) band II; (c) FWHM of the overall CL spectrum; and (d) spectral distance between bands II and I.

Image of FIG. 14.
FIG. 14.

(Color) SEM micrograph (a) and residual stress map (b) collected in the neighborhood of the corner of an indentation print on the plane of the crystal.

Tables

Generic image for table
Table I.

Morphological characteristics of various spectral bands of the CL spectrum of single crystal.

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/content/aip/journal/jap/98/3/10.1063/1.2006221
2005-08-15
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Micromechanical analysis of fracture and domain switching in barium titanate single crystal using cathodoluminescence piezospectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.2006221
10.1063/1.2006221
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