Raman spectroscopy of (Ca,Mg)MgSi2O6 clinopyroxenes

@article{Tribaudino2012RamanSO,
  title={Raman spectroscopy of (Ca,Mg)MgSi2O6 clinopyroxenes},
  author={Mario Tribaudino and Luciana Mantovani and Danilo Bersani and Pier Paolo Lottici},
  journal={American Mineralogist},
  year={2012},
  volume={97},
  pages={1339 - 1347}
}
Abstract The Raman spectra of eight clinopyroxenes synthesized along the join diopside-clinoenstatite (Di- Cen, CaMgSi2O6-Mg2Si2O6) were measured. The splitting of the 670 cm-1 mode of the Ag symmetry, observed in the composition Di52En48 to clinoenstatite, was interpreted as evidence of a C2/c-P21/c phase transition. The transition was also revealed by deviation from the linear dependence of the peak position vs. composition and by the appearance of several new peaks in the samples richer in… Expand
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Structural and Raman spectroscopic characterization of pyroxene-type compounds in the CaCu1-xZnxGe2O6 solid-solution series.
TLDR
Differential thermal analysis, single-crystal X-ray diffraction and Raman spectroscopy were used to characterize phase stability, phase changes and structural alterations induced by the substitution of Cu2+ with Zn2+. Expand
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The Raman spectra of the end member pyroxenes CaZnSi2O6 and Zn2Si2O6 are calculated by quantum mechanical modeling and compared with the experimental ones measured in synthetic (CaxZn1−x)ZnSi2O6Expand
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ABSTRACT A P21/c synthetic (Ca0.2Co0.8)CoSi2O6 pyroxene was synthesized by slow cooling from melt at high pressure. Single crystals suitable for X-ray diffraction were obtained and refined. TheExpand
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Structure, bond characteristics and Raman spectra of CaMg1-xMnxSi2O6 microwave dielectric ceramics
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Raman spectra of orthoenstatite have been computed from first principles, employing the hybrid Hamiltonian WC1LYP.[1] The calculated data show excellent agreement with the experimental data fromExpand
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References

SHOWING 1-10 OF 49 REFERENCES
Crystal structures of Ca-rich clinopyroxenes on the CaMgSi2O6-Mg2Si2O6 join
The structural changes occurring in the clinopyroxenes with composition Di100, Di90En10 and Di80En20, due to the Ca-Mg substitution in the M2 site, have been studied. Evidence is given that withExpand
Average and local structure in P21/c clinopyroxenes along the join diopside-enstatite (CaMgSi2O6-Mg2Si2O6)
A single-crystal X-ray refinement has been performed on two synthetic P 2 1/c clinopyroxenes of composition Ca 0.15 Mg 1.85 Si 2 O 6 (Di 15 En 85 ) and Ca 0.23 Mg 1.77 Si 2 O 6 (Di 23 En 77 ).Expand
Thermochemistry of synthetic clinopyroxenes on the join CaMgSi2O6-Mg2Si2O6
Abstract Enthalpies of solution of synthetic clinopyroxenes on the join CaMgSi2O6-Mg2Si2O6 have been measured in a melt of composition Pb2B2O5 at 970 K. Most of the measurements were made on samplesExpand
Phase transition induced by solid solution: The BCa-BMg substitution in richteritic amphiboles
Abstract Eleven compositions along the join Na(NaMg)Mg5Si8O22(OH)2-Na(NaCa)Mg5Si8O22(OH)2 (“magnesiorichterite”-richterite) have been synthesized at T = 800-850 °C and PH₂O = 0.35-0.5 GPa. The runExpand
A transmission electron microscope investigation of the C2/c→ P21/c phase transition in clinopyroxenes along the diopside-enstatite (CaMgSi2O6-Mg2Si2O6) join
Abstract A transmission electron microscope investigation was performed on a series of synthetic clinopyroxenes with compositions between Ca0.7Mg1.3Si2O6 and Ca0.5Mg1.5Si206. For samples with CaExpand
Average structure and M2 site configurations in C2/c clinopyroxenes along the Di-En join
In order to clarify the structural configurations observed in Diss in the Ca-rich region of the Di-En join (in which TEM observations show neither exsolution microstructures nor evidence of spinodalExpand
Raman spectroscopic study of pyroxene structures from the Munni Munni layered intrusion, Western Australia
Raman spectra were obtained for a series of clinopyroxenes, orthopyroxenes and inverted pigeonites from the Munni Munni layered mafic-ultramafic intrusion in Western Australia. Their compositionExpand
Raman spectroscopic characteristics of Mg-Fe-Ca pyroxenes
Abstract Raman spectra of several compositions of (Mg, Fe, Ca)SiO3 pyroxenes were collected at ambient conditions. More than 10 Raman vibrational modes were observed for these pyroxenes in theExpand
A P21/c-C2/c high-pressure phase transition in Ca0.5Mg1.5Si2O6 clinopyroxene
Abstract A high-pressure P21/c-C2/c phase transition in a synthetic iron-free clinopyroxene of composition Ca0.5Mg1.5Si2O6 was observed at pressure between 3 and 5 GPa from powder diffraction dataExpand
RIETVELD REFINEMENT OF CLINOPYROXENES WITH INTERMEDIATE Ca-CONTENT ALONG THE JOIN DIOPSIDE-ENSTATITE
The structures of fi ve clinopyroxenes on the diopside–enstatite join have been refi ned by Rietveld analysis of powder-diffraction patterns obtained with synchrotron radiation. The reliability ofExpand
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