Electron microscope study of surface markings left by unsteady cleavage crack propagation in NaCl single crystals

Wainer, L. S. De; Bassett, G. A.

doi:10.1080/01418617808239266

Cited by 33 publications

(2 citation statements)

References 10 publications

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“…The orientation of these steps was not related to the energetically stable crystallographic directions. In general, these steplines indicate the direction and velocity of crack propagation …”

Section: Resultsmentioning

confidence: 99%

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Scanning Force Microscopy Study of Etch Pits Formed during Dissolution of a Barite (001) Surface in CDTA and EDTA Solutions

et al. 1999

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Dissolution of the barite (001) surface in aqueous solutions of 0.18 M CDTA (trans-1,2-cyclohexylenediaminetetraacetic acid) and 0.18 M EDTA (ethylenediaminetetraacetic acid) at pH 12 was investigated using ex situ scanning force microscopy. In both solutions, triangular and trapezoidal etch pits developed on the (001) surface and became deeper and longer with increasing dissolution time. The orientation of the etch pits in CDTA and EDTA solutions was elongated along the crystallographic b axis. Furthermore, dissolution of the (001) surface in a layer-by-layer fashion was observed. This resulted in the formation of “alternating” etch pits with heights of one half-unit cell (about 3.6 Å), with the orientations of any two consecutive etch pits pointing oppositely to each other. In CDTA, etch pits within the half-unit cell were frequently bounded along the 〈120〉 and 〈010〉 directions. However, in EDTA, etch pits within the half-unit cell were bounded along the 〈110〉 and 〈010〉 directions. The dissolution behavior of barite in these two solutions is different based on the observed differences in the etch pits geometries as an assay for specific interactions between the crystal surface and organic molecules. Thus, we suggest that CDTA molecules bind to one Ba2+ cation along the 〈120〉 and/or 〈010〉 directions and EDTA molecules bind along the 〈110〉 directions to two Ba2+ cations exposed on the (001) surface.

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Section: Resultsmentioning

confidence: 99%

“…In general, these steplines indicate the direction and velocity of crack propagation. 29 Dissolution of the Barite (001) Surface in CDTA Solution. Barite is very insoluble in water at room temperature.…”

Section: Along [100]mentioning

confidence: 99%

Scanning Force Microscopy Study of Etch Pits Formed during Dissolution of a Barite (001) Surface in CDTA and EDTA Solutions

et al. 1999

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Fracture‐induced luminescence in Alkali Halides

Strube¹,

Linke²

1984

Cryst. Res. Technol.

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Crack propagatioii in dielectric solids is connected with inany structural and electronic excitation processes. I n order t o obtain some inforniation o n the elementary excitation inechanism, crack velocity and fracture-induced luminescence in LiF and N a F (as received; doped; X-irradiated) under high vacuum conditions were correlated. Time-resolved crack velocity measurements revealed the usually discontinuous manner of crack prcipagation; maximum crack velocities of 3800 in/s (LiF) arid 3000 m/s (NaF) were observed. Luininescencc excitation in the X-irradiated samples occured at slow crack motion i.e. for increased plastic processes in the crack tip zone. The luininescence was explained 115 the recombination of stabilized radiation defects (F-centres and interstitial halogen atonis) involving a radiative exciton decay. The reconibination is triggered by the crack r i a mobilization of the reconibination partners by dislocations or lattice deformation processes.Die RiBaushreitung in dielektrischen Festkorpern ist mit zahlreichen strukturellen urid elektronischen Anregungsprozessen verbunden. U m Aussagen zum elementaren Anregungsmechanismiis zu erhalten , wurden Riegeschwindigkeit und bruchinduzierte LuininesLenz in LiF und N a P (luftgezogen ; dotiert ; rontgenhestrahlt) linter Hochvakuurnbedingungen korreliert. Die zeitaufgelijste Messung der Bruchgeschwiildigkeit zeigte, da8 die RiQausbreitung im allgemeinen unstetig crfolgt ; es wurden maximale Briichgeschwindigkeiten von 3800 m p (LiF) und 3000 m p (NaF) beobachtet. Die bruchinduzierte Luniintszenz in rontgenhestrahlten Kristallen trat uberwiegend bei langsarnen Bruchgeschwindigkeiten, d. h. verstarlrten plastischen Verforrnungsprcizessen im Bereich der Riespitze auf. Die Lumines7enz wurde auf die Rekombination stabilisierter Strahlungsdefekte (F-Zentren und Halogenatome auf Zwischengitterplatz) zuriickgefuhrt, die durch die Versetzungsbewegung oder Gitterverzerrungen wahrend der RilJausbreitung beweglich werden und Excitonen hilden.

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On the orientation relationships of decorating gold particles on alkali halides

Barna

Hiti

Malicskó

et al. 1989

Phys. Stat. Sol. (a)

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It is demonstrated that the step‐free terraces on the cleaved pure {001} faces of alkali halides contain “intrinsic active sites” being active both in the nucleation and in the development of the {111} orientation of deposits. Taking into account the existence of the intrinsic active sites and their sensitivity against contaminations a rather comprehensive description of the phenomena in the decoration and epitaxy experiments (e.g. coexistence of {111} and {001} orientations) is given.

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Electron microscope study of surface markings left by unsteady cleavage crack propagation in NaCl single crystals

Cited by 33 publications

References 10 publications

Scanning Force Microscopy Study of Etch Pits Formed during Dissolution of a Barite (001) Surface in CDTA and EDTA Solutions

Scanning Force Microscopy Study of Etch Pits Formed during Dissolution of a Barite (001) Surface in CDTA and EDTA Solutions

Fracture‐induced luminescence in Alkali Halides

On the orientation relationships of decorating gold particles on alkali halides

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