Skip to content

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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)419–426
Number of pages8
JournalLithos
Volume278-281
Early online date21 Feb 2017
DOIs
DateAccepted/In press - 15 Feb 2017
DateE-pub ahead of print - 21 Feb 2017
DatePublished (current) - May 2017

Abstract

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 A R = 11.9 D + 19.6 + 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.

    Research areas

  • Diamond, Platelets, FTIR, TEM

Download statistics

No data available

Documents

Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at http://www.sciencedirect.com/science/article/pii/S002449371730066X. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 17 MB, PDF document

DOI

View research connections

Related faculties, schools or groups