Lamellar formations in the structure of natural diamonds

Sobolev, E. V.; Lenskaya, S. V.; Lisoivan, V. I.

doi:10.1007/bf00744390

Cited by 22 publications

(18 citation statements)

References 14 publications

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“…Later, the ca. 1370 cm -1 infrared absorption peak was also attributed to platelets and its intensity was shown to be proportional to the anomalous X-ray spikes (Sobolev et al, 1969).…”

Section: Introductionmentioning

confidence: 98%

“…The infrared platelet peak is known to vary in size and shape (Woods, 1986). Sobolev et al (1969) established that the position of the peak maximum is sample dependent and occurs within the range 1358-1378 cm -1 . They also demonstrated that peak position is a function of platelet diameter using FTIR and TEM data from Evans and Phaal (1962).…”

Section: Introductionmentioning

confidence: 99%

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The relationship between platelet size and the B′ infrared peak of natural diamonds revisited

Speich

Kohn

Wirth

et al. 2017

Lithos

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Platelets in diamond are extended planar defects that are thought to be generated during the nitrogen aggregation process in type Ia diamonds. They were subjected to intensive research during the 1980s and 1990s but the techniques used for observation of defects in diamond have improved since that time and new insights can be gained by further study. This study combines high resolution Fourier Transform Infrared (FTIR) analysis, with an emphasis on the main platelet peak, and transmission electron microscopic (TEM) imaging. By performing TEM and FTIR analyses on volumes of diamond that were closely spatially related it is shown that the average platelet diameter, D, follows the relationship D = a x−b where x is the position of the platelet peak in the infrared spectrum, a is a constant and b is the minimum position of the platelet peak. The best fit to the data is obtained if a value of b = 1360 cm-1 is used, giving a fitted value of a = 221. The observed variation in infrared (IR) peak width can also be explained in terms of this relationship. Additionally, platelet morphology was found to vary according to diameter with large platelets being more elongated. The tendency to become more elongated can be described by the empirical equation AR = 11.9 D+19.6 + 0.4 where AR is the aspect ratio. Using the relationships established here, it will be possible to study platelet abundance and size as a function of parameters such as nitrogen concentration, nitrogen aggregation and diamond residence time in the mantle. This work therefore will open up new methods for constraining the geological history of diamonds of different parageneses and from different localities.

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“…Later, the ca. 1370 cm -1 infrared absorption peak was also attributed to platelets and its intensity was shown to be proportional to the anomalous X-ray spikes (Sobolev et al, 1969).…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

The relationship between platelet size and the B′ infrared peak of natural diamonds revisited

Speich

Kohn

Wirth

et al. 2017

Lithos

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“…* This follows from a study [8] of the parallel trend in the strength of these extra reflections and the UV absorption. We have shown [1,2] that ~trogen Which produces the A bands in the IR (strongest band 1282 em -1) and the UV absorption below 3000 A has no relation to the extra reflections, and hence to the platelets; it is present in some other form, perhaps as N 2 groups.~ The nature of the platelets thus remains open.…”

mentioning

confidence: 94%

“…We have shown [1,2] that the extra reflections of thorn shape in Laue patterns are quantitatively related to the 1365 cm -~ IR band. It has now been found that these reflections for natural diamonds are due to platelets parallel to the cube faces, whose existence was predicted theoretically in a discussion of the nature of the reflections [3].…”

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confidence: 95%

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Effects of platelets on the absorption and luminescence-excitation spectra of natural diamonds

Sobolev¹,

Il'in²,

Lenskaya³

et al. 1968

J Appl Spectrosc

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It is important to correlate the properties of a specimen in research on the real structure of diamonds. We have shown [1,2] that the extra reflections of thorn shape in Laue patterns are quantitatively related to the 1365 cm -~ IR band. It has now been found that these reflections for natural diamonds are due to platelets parallel to the cube faces, whose existence was predicted theoretically in a discussion of the nature of the reflections [3]. These platelets were subsequently observed directly with the electron microscope [4].It has become generally accepted in the literature on diamonds that these platelets contain most of the nitrogen impurity, which if present in high concentration gives rise [5] to the main features of the IR and UV spectra of type I diamonds.* This follows from a study [8] of the parallel trend in the strength of these extra reflections and the UV absorption. We have shown [1, 2] that ~trogen Which produces the A bands in the IR (strongest band 1282 em -1) and the UV absorption below 3000 A has no relation to the extra reflections, and hence to the platelets; it is present in some other form, perhaps as N 2 groups.~ The nature of the platelets thus remains open.One way of resolving this problem is to examine how these structure defects affect the physical properties of diamonds. We have examined the effects of platelets on the UV absorption spectrum and on the *Gas chromatography [6] and activation analysis [7] show that type I diamonds contain much nitrogen. t This, however, does not rule out presence of some of the nitrogen in platelet form.

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The behaviour of platelets in natural diamonds and the development of a new mantle thermometer

Speich

Kohn

Bulanova

et al. 2018

Contrib Mineral Petrol

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Lamellar formations in the structure of natural diamonds

Cited by 22 publications

References 14 publications

The relationship between platelet size and the B′ infrared peak of natural diamonds revisited

The relationship between platelet size and the B′ infrared peak of natural diamonds revisited

Effects of platelets on the absorption and luminescence-excitation spectra of natural diamonds

The behaviour of platelets in natural diamonds and the development of a new mantle thermometer

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