X-ray tomographic study of spatial distribution of microinclusions in natural fibrous diamonds

Kovalenko, E. S.; Shiryaev, А. A.; Kaloyan, A. A.; Подурец, К. М.

doi:10.1016/j.diamond.2012.09.006

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…По данным ИК-спектроскопии (данная работа) и аналитической электронной микроскопии [Титков и др., 2006] микровключения в кубах II разновидности подобны по минеральному составу включениям, наблюдавшимся в алмазах III-IV разновидностей с волокнистым строением и в кристаллах с облаковидными включениями [Zedgenizov et al, 2004;Ширяев и др., 2005а;Logvinova et al, 2008;Зедгенизов и др., 2011;Shirey et al, 2013]. Одним из возможных объяснений появления волокнистого строения в алмазах III и IV разновидностей, не наблюдавшегося в изученных алмазах II разновидности, являются более высокое пересыщение и изменение смачиваемости поверхности кристалла ростовой средой и сопутствующие эффекты отравления поверхности микровключениями [van Enckevort, van der Berg, 1998;Kovalenko et al, 2012].…”

Section: рис 8 представительные спектры разных зон оранжевого алмазunclassified

Defects in Cubic Diamonds From the Placers in the Northeastern Siberian Platform: Results of Ir Microspectrometry

2015

GiG

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Section: рис 8 представительные спектры разных зон оранжевого алмазunclassified

Defects in Cubic Diamonds From the Placers in the Northeastern Siberian Platform: Results of Ir Microspectrometry

2015

GiG

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Defects in cubic diamonds from the placers in the northeastern Siberian platform: results of IR microspectrometry

Titkov

Shiryaev

Zudina

et al. 2015

Russian Geology and Geophysics

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Defects in yellowish-green, yellow, and orange diamonds of cubic habit from placers of the northeastern Siberian Platform were studied by IR spectroscopy. In addition to the main A, C, and, probably, B defects, the diamonds contain X and Y centers and amber defects of different types and show absorption bands at 1240, 1270, and 1290–1295 cm–1, peaks in the region 1350–1380 cm–1, and bands between 3100–3300 cm–1. Diamonds of different colors contain different associations of structural defects, though they belong to the same variety II according to the Orlov classification. According to the integral spectra of the diamond crystals, the content of structural nitrogen impurity is low, 60–265 ppm. However, spatially resolved spectroscopic examination of diamond plates has revealed highly nonuniform distribution of defects in all diamond crystals. The general regularity for the studied diamonds is a decrease in the total nitrogen content and in the relative fraction of the major A defect from core to periphery of a crystal. The content of structural nitrogen impurity in the core reaches 900 ppm, which is higher than the average N content in widespread octahedral diamond crystals. The presence of C, Y, and X defects in the majority of the samples indicates short postgrowth annealing of these diamonds. The genetic significance of the obtained data on structural defects is discussed.

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Unusual types of extended defects in synthetic high pressure–high temperature diamonds

et al. 2018

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X-ray tomographic study of spatial distribution of microinclusions in natural fibrous diamonds

Cited by 4 publications

References 14 publications

Defects in Cubic Diamonds From the Placers in the Northeastern Siberian Platform: Results of Ir Microspectrometry

Defects in Cubic Diamonds From the Placers in the Northeastern Siberian Platform: Results of Ir Microspectrometry

Defects in cubic diamonds from the placers in the northeastern Siberian platform: results of IR microspectrometry

Unusual types of extended defects in synthetic high pressure–high temperature diamonds

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