Evaporation Spirals and Loops on KCl Single Crystals

Patel, A. R.; Chaudhari, R. M.

doi:10.1143/jjap.7.363

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…According to Lang, periodic bunching together of advancing or retreating atomic sheets, frequently occurring on a crystal surface inclined at small angles with densely packed atomic planes resulting in microscopically observable steps, and a single 'mistake' in the early stages of step formation may be held responsible for continuous spiral steps. Patel and Chaudhari (1968) have explained the formation of spirals on thermally etched potassium chloride crystals by a similar mechanism. The present paper is a brief report of etch spirals produced on the cleavages of potassium bromide single crystals by etching.…”

Section: Introductionmentioning

confidence: 95%

Spiral etch pits in KBr single crystals

Patel

Agarwal

1971

J. Phys. D: Appl. Phys.

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Freshly cleaved (100) cleavages of KBr single crystals grown in the laboratory have been etched in an etchant containing 10 ml absolute ethyl alcohol, 0·5 ml n-butyl alcohol, 0·1 ml formaldehyde and 0·1 ml distilled water. Both clockwise and anticlockwise spiral etch pits are produced. By etching (100) matched cleavage pairs in the same conditions, one-to-one correspondence in number, position and shape but not the sense of some of the spirals has been established. By re-etching a cleavage face having spiral etch pits in dislocation etchant, an etch pit is formed exactly at the centre of each spiral, indicating thereby that the spiral etch pits nucleate at the sites of dislocations terminating on the crystal face. The implications are discussed.

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Section: Introductionmentioning

confidence: 95%

Spiral etch pits in KBr single crystals

Patel

Agarwal

1971

J. Phys. D: Appl. Phys.

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References

1987

Etching of Crystals - Theory, Experiment, and Application

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Thermal Etching of NaF Cleavages

Patel

Chaudhari

1969

Jpn. J. Appl. Phys.

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Freshly cleaved surfaces of sodium fluoride have been thermally etched in the range of temperature between 860°C and 930°C for the required time. The formation of circularly terraced pits has been discussed. The topography of thermal etch patterns is studied by multiple beam interferometry. Interaction of circular etch fronts from the point of nucleation of two or more dislocations is illustrated. Under controlled conditions of thermal etching, in addition to the thermal etch pits, spiral structures have been observed. It is conjectured that these spirals might have been formed as explained by Lang (1957). It is conjectured that the etch patterns appearing similar to the pattern observed at the Frank-Read sources might have been formed due to a pair of dislocations of opposite sign.

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Evaporation Spirals and Loops on KCl Single Crystals

Cited by 4 publications

References 8 publications

Spiral etch pits in KBr single crystals

Spiral etch pits in KBr single crystals

References

Thermal Etching of NaF Cleavages

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