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

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 741 ◽  
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.

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

2021 ◽  
Author(s):  
Mikhail A. Ivanov ◽  
Marina A. Fedotova ◽  
Fedor F. Protopopov ◽  
Semyon P. Leontyev
Keyword(s):  
Ir Spectroscopy ◽  
Natural Diamonds ◽  
Impurity Centers

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.

New semiconducting compounds of diamond type structure

Physica ◽  
1954 ◽  
Vol 3 (7-12) ◽  
pp. 1107-1109 ◽  
Author(s):  
C GOODMAN ◽  
R DOUGLAS
Keyword(s):  
Type Structure ◽  
Semiconducting Compounds ◽  
Diamond Type

RUTILE-DIAMOND INTERGROWTHS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA)

2017 ◽  
Vol 39 (3) ◽  
pp. 17-31
Author(s):  
V. Kvasnytsya ◽  
◽  
O. Vyshnevskyi ◽  
Keyword(s):  
Kimberlite Pipe

Strong Coupling of Electron and Nuclear Spins: Outlook and Prospects

2018 ◽  
Author(s):  
M. M. Glazov
Keyword(s):  
Energy Spectrum ◽  
Charge Carrier ◽  
Strong Coupling ◽  
Nuclear Spin ◽  
Spin Dynamics ◽  
Spin Polaron ◽  
Nuclear Spins ◽  
Deep Impurity ◽  
Impurity Centers ◽  
Ordered State

In this chapter, some prospects in the field of electron and nuclear spin dynamics are outlined. Particular emphasis is put ona situation where the hyperfine interaction is so strong that it leads to a qualitative rearrangement of the energy spectrum resulting in the coherent excitation transfer between the electron and nucleus. The strong coupling between the spin of the charge carrier and of the nucleus is realized, for example in the case of deep impurity centers in semiconductors or in isotopically purified systems. We also discuss the effect of the nuclear spin polaron, that is ordered state, formation at low enough temperatures of nuclear spins, where the orientation of the carrier spin results in alignment of the spins of nucleus interacting with the electron or hole.

scholarly journals An experimental and theoretical study of Ni impurity centers in Ba0.8Sr0.2TiO3

2017 ◽  
Vol 59 (8) ◽  
pp. 1512-1519 ◽  
Author(s):  
I. A. Sluchinskaya ◽  
A. I. Lebedev
Keyword(s):  
Theoretical Study ◽  
Impurity Centers
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