Zircon Raman

Using a combination of IR, UV/VIS reflection and Raman spectroscopies, thermally treated corundum and zircon and radioactively irradiated topaz and spodumen maybe identified (Tretyakova and Tretaykova 1996). 

The second provenance criterion is based on the identification of inclusions in gemstones. Micro-Raman spectrometry was used for this task in almandine garnets. Various inclusions were observed like apatite, zircon, monazite, calcite, and quartz and two of them, curved needles of sillimanite (Al2Si05) and 10-pm metamict radioactive crystals, were specifically found in archaeological garnets. Fig. 6 shows the Raman spectra of a sillimanite needle, which is a mineral formed under a high temperature and high pressure metamorphism. 

Zhang H, Leppavuori S, Karjalainen P (1995) Raman spectra in laser ablated lead zirconate titanate thin films near the morphotropic phase boundary. J Appl Phys 77 2691 Ching-Prado E, Cordero J, Katiyar RS, Bhalla AS (1996) Temperature-dependent Raman scattering in PT and PMN-PT thin films. J Vac Sci Technol A 14 762... 

Parkinson C. D. and Katayama 1. (1999) Present-day ultrahigh-pressure conditions of coesite inclusions in zircon and garnet evidence from laser Raman microspectroscopy. Geology 27, 979-982. 

Nasdala L, Inner G, Wolf D (1995) The degree of metamictization in zircon a Raman spectroscopic study. Neues Jahrb Mineral 7 471-478... 

Excitation by CW laser with 532 and 780 nm revealed multiple narrow lines (Fig. 4.92). Recently cw luminescence spectra of zircon were smdied under different laser excitations including artificially activated samples (Lenz et al. 2015). It was found that Raman spectra of zircon may be obscured strongly by emissions of Tm " and Nd " if spectra were recorded using 785 nm laser-excitation. Emissions of Er " typically interfere with Raman spectra obtained with green excitation. In the 532 and 514 excitations the " S3/2-" ll5/2 transition of Et " is observed as group of bands at different relative Raman shifts. 

Figure 27 Raman spectra showing the evolution of a phase transition in Ba-doped lead zirconate (Pbi ,BaJZr03 as T is reduced from 320 to 40 K. (After Ref. 47.)...

Figure 34 The Raman spectra of a zircon microinclusioii ZrSi04 (b) inside an intaglio composed of the chrysoprase variety of a-quartz (a) the extra band close to 500 cm" represents the copresence of minor moganite, which is another polymorph of Si02. (After Ref. 61.)...

Panchal, V., Lopez-Moreno, S., Santamaria-Perez, D., Errandonea, D., Manjon, F. J., Rodriguez-Hernandez, P., et al. (2011). Zircon to monazite phase transition in CeVOa X-ray diffraction and Raman-scattering measurements. Physical Review B, 84, 024111. 

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