TY - JOUR

T1 - Unusual growth macrolayers on {100} faces of diamond crystals from magnesium-based systems

AU - Khokhryakov, Alexander F.

AU - Nechaev, Denis V.

AU - Palyanov, Yuri N.

PY - 2016/12/1

Y1 - 2016/12/1

N2 - We studied unusual growth macrolayers on the {100} faces of diamond crystals grown in Mg-C and Mg0.9Ge0.1-C systems at 7.0 GPa and in the temperature range of 1800–1900 °C. The layers were shaped as rectangles highly elongated in one of the [110] directions. The layer elongation (length to width ratio) was different, but did not exceed 23. We found that the ends of the macrolayers in most cases were composed of {111} microfacets, and their growth occurred by layers along these microfacets. Using selective etching, we found that the macrolayers were not associated with outcrops of dislocations and any planar defects on the {100} faces. It is supposed that the formation of these highly elongated layers occurs by two-dimensional nucleation that becomes possible at high carbon supersaturation under conditions of kinetically limited diamond growth in Mg-based systems.

AB - We studied unusual growth macrolayers on the {100} faces of diamond crystals grown in Mg-C and Mg0.9Ge0.1-C systems at 7.0 GPa and in the temperature range of 1800–1900 °C. The layers were shaped as rectangles highly elongated in one of the [110] directions. The layer elongation (length to width ratio) was different, but did not exceed 23. We found that the ends of the macrolayers in most cases were composed of {111} microfacets, and their growth occurred by layers along these microfacets. Using selective etching, we found that the macrolayers were not associated with outcrops of dislocations and any planar defects on the {100} faces. It is supposed that the formation of these highly elongated layers occurs by two-dimensional nucleation that becomes possible at high carbon supersaturation under conditions of kinetically limited diamond growth in Mg-based systems.

KW - A1.Crystal morphology

KW - A1.Etching

KW - A2.Single crystal growth

KW - B1.Diamond

UR - http://www.scopus.com/inward/record.url?scp=84990063312&partnerID=8YFLogxK

U2 - 10.1016/j.jcrysgro.2016.10.004

DO - 10.1016/j.jcrysgro.2016.10.004

M3 - Article

AN - SCOPUS:84990063312

VL - 455

SP - 76

EP - 82

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

SN - 0022-0248

ER -