(Na,Ca)(Ti3+,Mg)Si2O6-clinopyroxenes at high pressure: influence of cation substitution on elastic behavior and phase transition
A compressional study of (Na,Ca)(Ti3+,Mg)Si2O6-clinopyroxenes was carried out at high pressures between 10−4 and 10.2 GPa using in situ single-crystal X-ray diffraction, Raman spectroscopy and optical absorption spectroscopy. Compressional discontinuities accompanied by structural changes, in partic...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2010
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| In: |
Physics and chemistry of minerals
Year: 2010, Volume: 37, Issue: 1, Pages: 25-43 |
| ISSN: | 1432-2021 |
| DOI: | 10.1007/s00269-009-0307-1 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s00269-009-0307-1
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| Author Notes: | Angela Ullrich, Ronald Miletich, Tonci Balic-Zunic, Lars Olsen, Fabrizio Nestola, Manfred Wildner, Haruo Ohashi |
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| 245 | 1 | 0 | |a (Na,Ca)(Ti3+,Mg)Si2O6-clinopyroxenes at high pressure |b influence of cation substitution on elastic behavior and phase transition |c Angela Ullrich, Ronald Miletich, Tonci Balic-Zunic, Lars Olsen, Fabrizio Nestola, Manfred Wildner, Haruo Ohashi |
| 246 | 1 | |i Abweichender Titel |a (Na,Ca)(Ti 3 + ,Mg)Si 2 O 6-clinopyroxenes at high pressure | |
| 246 | 3 | 3 | |a (Na,Ca)(Ti 3+, Mg)Si 2 O 6-clinopyroxenes at high pressure |
| 264 | 1 | |c 2010 | |
| 300 | |b Diagramme | ||
| 300 | |a 19 | ||
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| 500 | |a Im Titel ist "3+" hochgestellt und die Ziffern "2" und "6" sind tiefgestellt | ||
| 500 | |a Online veröffentlicht: am 24 Mai 2009 | ||
| 500 | |a Gesehen am 26.01.2024 | ||
| 520 | |a A compressional study of (Na,Ca)(Ti3+,Mg)Si2O6-clinopyroxenes was carried out at high pressures between 10−4 and 10.2 GPa using in situ single-crystal X-ray diffraction, Raman spectroscopy and optical absorption spectroscopy. Compressional discontinuities accompanied by structural changes, in particular, the appearance of two distinct Ti3+-Ti3+ distances within the octahedral chains at 4.37 GPa, provide evidence for the occurrence of a phase transition in NaTi3+Si2O6. Equation-of-state parameters are K0 = 115.9(7) GPa with K′ = −0.9(3) and K0 = 102.7(8) GPa with K′ = 4.08(5) for the low- and high-pressure range, respectively. The transition involves a C2/c-P$$ \overline{1} $$symmetry change, which can be confirmed by the occurrence of new modes in Raman spectra. Since no significant discontinuity in the evolution of the unit-cell volume with pressure has been observed, the transition appears to be second-order in character. The influence of the coupled substitution Na+Ti3+↔Ca2+Mg2+ on the static compression behavior and the structural stability has been investigated using a sample of the intermediate composition (Na0.54Ca0.46)(Mg0.46Ti0.54)Si2O6. No evidence for a deviation from continuous compression behavior has been found, neither in lattice parameter nor in structural data and the fit of a third-order Birch-Murnaghan equation-of-state to the pressure-volume data yields a bulk modulus of K0 = 109.1(5) GPa and K′ = 5.02(13). Raman and polarized absorption spectra have been compared to NaTiSi2O6 and reveal major similarities. The main driving force for the phase transition in NaTi3+Si2O6 is the localization of the Ti3+d-electron and the accompanying distortion, which is suppressed in the (Na,Ca)(Ti3+,Mg)Si2O6-clinopyroxene. | ||
| 650 | 4 | |a Clinopyroxene | |
| 650 | 4 | |a Compressibility | |
| 650 | 4 | |a High pressure | |
| 650 | 4 | |a Single crystal | |
| 650 | 4 | |a Transition metal | |
| 650 | 4 | |a X-ray diffraction | |
| 700 | 1 | |a Miletich, Ronald |e VerfasserIn |4 aut | |
| 700 | 1 | |a Balic-Zunic, Tonci |e VerfasserIn |4 aut | |
| 700 | 1 | |a Olsen, Lars |e VerfasserIn |4 aut | |
| 700 | 1 | |a Nestola, Fabrizio |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wildner, Manfred |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ohashi, Haruo |e VerfasserIn |4 aut | |
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