Processing of natural diamond using nanosecond and picosecond lasers: relative merits and demerits

2008 ◽  
Author(s):  
S. K. Sudheer ◽  
Bharat Kakadia ◽  
V. P. Mahadevan Pillai ◽  
George A. Shafeev ◽  
Alexander V. Simakin
Keyword(s):  
Natural Diamond ◽  
Picosecond Lasers

The value of Electron Microscope studies of imperfect natural diamonds

1990 ◽  
Vol 48 (4) ◽  
pp. 194-195
Author(s):  
J C Walmsley ◽  
A R Lang
Keyword(s):  
Electron Microscope ◽  
Classification Scheme ◽  
Natural Diamond ◽  
Sudden Change ◽  
Growth Conditions ◽  
Diamond Growth ◽  
Major Constituent ◽  
Natural Diamonds ◽  
Type Ia ◽  
Platelet Defects

Interest in the defects and impurities in natural diamond, which are found in even the most perfect stone, is driven by the fact that diamond growth occurs at a depth of over 120Km. They display characteristics associated with their origin and their journey through the mantle to the surface of the Earth. An optical classification scheme for diamond exists based largely on the presence and segregation of nitrogen. For example type Ia, which includes 98% of all natural diamonds, contain nitrogen aggregated into small non-paramagnetic clusters and usually contain sub-micrometre platelet defects on {100} planes. Numerous transmission electron microscope (TEM) studies of these platelets and associated features have been made e.g. . Some diamonds, however, contain imperfections and impurities that place them outside this main classification scheme. Two such types are described.First, coated-diamonds which possess gem quality cores enclosed by a rind that is rich in submicrometre sized mineral inclusions. The transition from core to coat is quite sharp indicating a sudden change in growth conditions, Figure 1. As part of a TEM study of the inclusions apatite has been identified as a major constituent of the impurity present in many inclusion cavities, Figure 2.

A Thick Overgrowth of CVD Synthetic Diamond on a Natural Diamond

2018 ◽  
Vol 36 (2) ◽  
pp. 134-141
Author(s):  
Shi Tang ◽  
Jun Su ◽  
Taijin Lu ◽  
Yongwang Ma ◽  
Jie Ke ◽  
...  
Keyword(s):  
Synthetic Diamond ◽  
Natural Diamond

On the lattice scattering and effective mass of holes in natural diamond

1979 ◽  
Vol 30 (6) ◽  
pp. 333-335 ◽  
Author(s):  
L. Reggiani ◽  
S. Bosi ◽  
C. Canali ◽  
F. Nava ◽  
S.F. Kozlov
Keyword(s):  
Effective Mass ◽  
Natural Diamond

Effect of pressure on synthetic diamond crystals at high temperatures and pressures in Fe/Ni catalyst system

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shuai Fang ◽  
Yongkui Wang ◽  
Liangchao Chen ◽  
Zhiyun Lu ◽  
Zhenghao Cai ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Growth Mechanism ◽  
Synthetic Diamond ◽  
Natural Diamond ◽  
Catalyst System ◽  
Necessary Condition ◽  
Ni Catalyst ◽  
Effect Of Pressure ◽  
Diamond Crystals ◽  
System P

Pressure is a necessary condition for the growth of natural diamond. Studying the effect of pressure on the nitrogen content of diamond is important for exploring the growth mechanism of...

A New, Nearly Single-Domain Surface Structure of Homoepitaxial Diamondr (001) Films

1996 ◽  
Vol 423 ◽  
Author(s):  
Yalei Kuang ◽  
Naesung Lee ◽  
Andrzej Badzian ◽  
Teresa Badzian ◽  
Tien T. Tsong
Keyword(s):  
Surface Structure ◽  
Natural Diamond ◽  
Single Layer ◽  
Chemical Vapor ◽  
Single Domain ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Plasma Chemical Vapor Deposition ◽  
Boron Doped ◽  
Step Edges

AbstractBoron-doped homoepitaxial diamond films were grown on natural diamond (001) substrates using microwave-assisted plasma chemical vapor deposition techniques. The surface structures were investigated using scanning tunneling microscopy (STM). This showed a dimertype 2×1 reconstruction structure with single-layer steps where dimer rows on the upper terrace are normal to or parallel to the step edges. We found that dimer rows parallel to the step edges are much longer than those normal to the step edges. The nearly single-domain surface structure observed by STM is in agreement with the low-energy electron diffraction (LEED) patterns from these surfaces. The high atomic resolution STM image showed that the local 1×1 configurations exist.

An X-ray topographic study of planar growth defects in a natural diamond

1965 ◽  
Vol 12 (115) ◽  
pp. 177-189 ◽  
Author(s):  
B. Lawn ◽  
Y. Kamiya ◽  
A. R. Lang
Keyword(s):  
Natural Diamond ◽  
X Ray ◽  
Growth Defects ◽  
Planar Growth

Ultraviolet Intrinsic and Extrinsic Photoconductivity of Natural Diamond

1967 ◽  
Vol 161 (3) ◽  
pp. 762-768 ◽  
Author(s):  
P. Denham ◽  
E. C. Lightowlers ◽  
P. J. Dean
Keyword(s):  
Natural Diamond

Ion channeling in natural diamond. II. Critical angles

1982 ◽  
Vol 26 (1) ◽  
pp. 17-25 ◽  
Author(s):  
T. E. Derry ◽  
R. W. Fearick ◽  
J. P. F. Sellschop
Keyword(s):  
Natural Diamond ◽  
Ion Channeling
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