An investigation of impurity centers of gem quality natural diamonds by IR-spectroscopy

Mixed-Habit Type Ib-IaA Diamond from an Udachnaya Eclogite

Minerals ◽

10.3390/min9120741 ◽

2019 ◽

Vol 9 (12) ◽

pp. 741 ◽

Cited By ~ 2

Author(s):

Dmitry Zedgenizov ◽

Irina Bogush ◽

Vladislav Shatsky ◽

Oleg Kovalchuk ◽

Alexey Ragozin ◽

...

Keyword(s):

Kimberlite Pipe ◽

Natural Diamonds ◽

Impurity Centers ◽

Diamond Type

The variety of morphology and properties of natural diamonds reflects variations in the conditions of their formation in different mantle environments. This study presents new data on the distribution of impurity centers in diamond type Ib-IaA from xenolith of bimineral eclogite from the Udachnaya kimberlite pipe. The high content of non-aggregated nitrogen C defects in the studied diamonds indicates their formation shortly before the stage of transportation to the surface by the kimberlite melt. The observed sectorial heterogeneity of the distribution of C- and A-defects indicates that aggregation of nitrogen in the octahedral sectors occurs faster than in the cuboid sectors.

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IR-spectroscopy of crystals containing Jahn-Teller impurity centers

Infrared Physics ◽

10.1016/0020-0891(89)90121-8 ◽

1989 ◽

Vol 29 (2-4) ◽

pp. 753-764 ◽

Cited By ~ 1

Author(s):

P.N. Bukivsky ◽

Yu.P. Gnatenko ◽

A.Kh. Rozhko ◽

I.A. Farina

Keyword(s):

Ir Spectroscopy ◽

Jahn Teller ◽

Impurity Centers

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Impurity centers in synthetic and natural diamonds with a system of electron-vibronic Lines at 418 nm in luminescence spectra

Physics of the Solid State ◽

10.1134/s1063783413010289 ◽

2013 ◽

Vol 55 (1) ◽

pp. 127-130 ◽

Cited By ~ 3

Author(s):

M. I. Rakhmanova ◽

V. A. Nadolinny ◽

O. P. Yuryeva

Keyword(s):

Luminescence Spectra ◽

Natural Diamonds ◽

Impurity Centers

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The value of Electron Microscope studies of imperfect natural diamonds

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174102 ◽

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.

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