Evgeniy Nikolaevich Kozlov
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Ekaterina Nikolaevna Fomina
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Vladimir Nikolaevich Bocharov
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Mikhail Yurievich Sidorov
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Natalia Sergeevna Vlasenko
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...
Abstract. Raman spectra of three natural carbonophosphates
(sidorenkite, bonshtedtite, and bradleyite) with the general formula
Na3MCO3PO4 (M is Mn, Fe, and Mg) were studied and compared.
These spectra showed from 21 to 24 vibrational bands, of which the two most
intense (964±5 and 1074±3 cm−1) correspond to
the υ1(P–O) and υ1(C–O) modes. These two
bands split into doublet peaks due to the occurrence of isomorphic
impurities. It was found that the crystallographic orientation of the sample
influences the intensity of most bands. Most bands assigned to the same
vibrations showed a regular shift (the smallest in sidorenkite spectra, an
intermediate in bonshtedtite, and the largest in bradleyite). We propose an
algorithm that allows for diagnostics of carbonophosphates in inclusions by
their Raman spectra, providing a reliable result even in the absence of energy-dispersive X-ray spectroscopy (EDX)
data.
A Raman spectroscopic study of the natural carbonophosphates Na<sub>3</sub><i>M</i>CO<sub>3</sub>PO<sub>4</sub> (<i>M</i> is Mn, Fe, and Mg)