Characteristic lengthscales of step bunching in KDP crystal growth: in situ differential phase-shifting interferometry study

Autor:	Peter G. Vekilov, N. A. Booth, A. A. Chernov
Rok vydání:	2002
Předmět:	Chemistry business.industry Resolution (electron density) Image processing Crystal growth Condensed Matter Physics Instability Inorganic Chemistry Wavelength Interferometry Optics Materials Chemistry Astronomical interferometer Diffusion (business) business
Zdroj:	Journal of Crystal Growth. :1818-1824
ISSN:	0022-0248
Popis:	We have developed a real-time phase-shifting interferometer capable of imaging of interfacial morphology with a depth resolution of ∼25 A and lateral resolution of ∼0.5 μm across a field of view of 2×2 mm 2 . The method employs a phase-shifting algorithm employing five interferograms and image processing that yield a three dimensional digital representation of the surface relief. The time resolution of imaging is 0.1 s. This method is applied in situ to the (1 0 1) face of potassium dihydrogen phosphate crystals growing from an aqueous solution. We image the formation and evolution of solution-flow induced step bunches and determine their characteristic wavelength to be λ c =45 μm. This wavelength is within the range predicted by a stability theory based on balance between the diffusion interaction between steps and capillarity. The found value suggests that step–step interactions are the likely major factor for instability.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b3bccc2ec3932fd672325490a16819ea https://doi.org/10.1016/s0022-0248(01)02101-7 Zobrazit plný text záznamu Full Text from ScienceDirect