Hydroxylherderite (Ca2Be2P2O8(OH)2) stability under extreme conditions (up to 750°C/100 GPa)

Gorelova, Liudmila A.; Vereshchagin, Oleg S.; Aslandukov, Andrey; Aslandukovа, Alena; Spiridonova, Daria V.; Krzhizhanovskaya, Maria G.; Kasatkin, Anatoly V.; Dubrovinsky, Leonid

doi:10.1111/jace.18923

Cited by 4 publications

(7 citation statements)

References 97 publications

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“…within the layer plane (Figure 7). Generally, such a type of high-temperature deformations is not typical for layered crystal structures, which often expand more intensely perpendicular to the layer plane; however, it has been previously observed for other gadolinite supergroup minerals (Krzhizhanovskaya et al, 2018;Gorelova et al, 2020;2021a;2022) and is usually explained by the shear deformation of the monoclinic plane (Bubnova, Filatov, 2008).…”

Section: Raman Spectra Of 'Minasgeraisite-(y)' In Comparison With Oth...mentioning

confidence: 88%

“…'Minasgeraisite-(Y)' (Bi-rich, Mn-bearing hingganite-(Y)) studied by us starts to decompose above 800 °C, which shows that it is more stable than borosilicate and beryllophosphate analogues (< 720 °C; Krzhizhanovskaya et al, 2018;Gorelova et al, 2022) but less stable than another beryllosilicate analogue with the fully occupied M-site (~1050 °C; Gorelova et al, 2021a). We can conclude that beryllosilicates are most stable at HT conditions within gadolinite supergroup and that the species with a higher M-site occupancy have higher stability upon heating.…”

Section: Discussionmentioning

confidence: 99%

“…For these experiments, the same single crystal was mounted on the quartz glass fibre (for more details see Gorelova et al , 2021a). SCXRD data were collected at different temperatures in the range of 27–1000°C with the temperature step 150°C below 600°C and 100°C above 600°C (there were 9 experimental points in total, including ambient temperature), temperature determination errors were ±10°C (see Gorelova et al , 2022). The data were integrated and corrected for background, Lorentz, and polarisation effects.…”

Section: Methodsmentioning

confidence: 99%

“…The results obtained throughout this study allow to assume that beryllosilicate compounds of the gadolinite supergroup minerals are the most stable compared to borosilicate and beryllophosphate analogues. Datolite, 'bakerite' and hydroxylherderite, studied before, start to decompose at 710, 530 and 720 °C, respectively (Krzhizhanovskaya et al, 2018;Gorelova et al, 2022). It is interesting to note that though the high-temperature and high-pressure behavior have to be similar (antipodal) (Hazen, Finger, 1982;Filatov, 1990), according to the general principles of comparative crystal chemistry, beryllophosphates are usually more stable compared to beryllo-, boro-and aluminosilicate compounds under high-pressure conditions (Gorelova et al, 2021b;Gorelova et al, 2022).…”

Section: Raman Spectra Of 'Minasgeraisite-(y)' In Comparison With Oth...mentioning

confidence: 99%

“…Datolite, 'bakerite' and hydroxylherderite, studied before, start to decompose at 710, 530 and 720 °C, respectively (Krzhizhanovskaya et al, 2018;Gorelova et al, 2022). It is interesting to note that though the high-temperature and high-pressure behavior have to be similar (antipodal) (Hazen, Finger, 1982;Filatov, 1990), according to the general principles of comparative crystal chemistry, beryllophosphates are usually more stable compared to beryllo-, boro-and aluminosilicate compounds under high-pressure conditions (Gorelova et al, 2021b;Gorelova et al, 2022). This difference in the high-temperature and high-pressure behavior can be explained by the different (OH)-content in the minerals of the gadolinite supergroup.…”

Section: Raman Spectra Of 'Minasgeraisite-(y)' In Comparison With Oth...mentioning

confidence: 99%

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Re-investigation of ‘minasgeraisite-(Y)’ from the Jaguaraçu pegmatite, Brazil and high-temperature crystal chemistry of gadolinite-supergroup minerals

Vereshchagin

Gorelova

Shagova

et al. 2023

MinMag

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The chemical composition (including B, Be, Li), the Raman spectrum and the crystal structure evolution (at the temperature range 27-1000 °C) of Mn-bearing, Bi-rich gadolinite subgroup mineral from the Jaguaraçu Pegmatite, Brazil (type-locality of minasgeraisite-(Y)) was studied. Elemental mapping revealed that the crystal being investigated has complex chemical zonation with various Bi (~8-24 wt.% Bi2O3), Ca (~8-10 wt.% CaO) and Y (~11-17 wt.% Y2O3) content. The sample in hand has all specific features of the chemical composition of minasgeraisite-(Y), except Ca excess and, thus, should be considered as hingganite-(Y). The Raman spectrum of the sample under study consists of the number of bands (140, 179, 243, 350, 446, 519, 559, 625, 902, 973, 3224, 3353, 3532 and 3763 cm -1 ) and is similar to that of hingganite-(Y) / -(Nd). Crystal structure refinement confirmed that the crystal in question should be considered as hingganite-(Y) and is in line with the previously obtained data on gadolinite subgroup minerals from the Jaguaraçu Pegmatite. High-temperature single crystal X-ray diffraction studies revealed that the mineral starts to decompose above 800 °C. We can conclude that beryllosilicates are most stable at high-temperature conditions within the gadolinite supergroup and that species with a higher M-site occupancy have higher stability upon heating.

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Section: Raman Spectra Of 'Minasgeraisite-(y)' In Comparison With Oth...mentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Raman Spectra Of 'Minasgeraisite-(y)' In Comparison With Oth...mentioning

confidence: 99%

Section: Raman Spectra Of 'Minasgeraisite-(y)' In Comparison With Oth...mentioning

confidence: 99%

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Re-investigation of ‘minasgeraisite-(Y)’ from the Jaguaraçu pegmatite, Brazil and high-temperature crystal chemistry of gadolinite-supergroup minerals

Vereshchagin

Gorelova

Shagova

et al. 2023

MinMag

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Topotactic transformation of gadolinite‐ to melilite‐type structure revisited

Gorelova,

Vereshchagin,

Shagova

et al. 2024

J Am Ceram Soc.

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Topotactic reactions can lead to the formation of new phases, which cannot be obtained via classical synthesis methods. The high‐temperature topotactic transformation of gadolinite‐type compounds, homilite Ca2Fe2+B2Si2O8O2 and datolite Ca2□B2Si2O8(OH)2, into a melilite‐type compound, okayamalite Ca2B2SiO7, was studied by in situ high‐temperature single‐crystal X‐ray diffraction and ex situ Raman spectroscopy. Furthermore, the density functional theory was used to calculate the electronic structures and Raman spectra of datolite, homilite, and okayamalite. At low temperatures (250–500°C), homilite undergoes the Fe oxidation process, whereas at high temperatures, both homilite and datolite transform into okayamalite (750 and 780°C, respectively). The transformation of datolite into okayamalite is a conversion of a single crystal to a polycrystalline aggregate, while the transformation of homilite into okayamalite is a transformation of a single crystal to a single crystal. Datolite derived from okayamalite is similar to natural okayamalite, whereas homilite derived from okayamalite shows Fe3+ for Si/B substitution. The existence of tetrahedrally coordinated Fe3+ leads to a stabilizing effect, resulting in the formation of a single crystal of okayamalite. In addition, the incorporation of iron into the structure of okaymalite leads to a change in the thermal behavior of the compound (α11 = 22 and 15×10−6°C–1 for datolite‐derived and homilite‐derived okayamalites, respectively). However, the thermal expansion of okayamalites is almost isotropic, which is typical for melilite‐type compounds.datolite, high‐temperature, homilite, okayamalite, topotactic reaction

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Phase Transformations in Feldspar Group Minerals with Paracelsian Topology under High Temperature and High Pressure

Gorelova

2023

Russian Geology and Geophysics

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—Feldspar group minerals (feldspars) form up to 60 vol.% of the Earth’s crust. The knowledge of their stability under extreme conditions (high-pressure and high-temperature) allow to better understand the processes, that occur in the subduction and collision processes. This review focuses on the behavior of feldspars with paracelsian topology (seven mineral species: three borosilicates, two aluminosilicates and two beryllophosphates) at elevated temperatures and pressures. Partly, new data on high-temperature behavior of paracelsian BaAl2Si2O8 (based on in situ high-temperature powder X-ray diffraction) provided. The high-temperature studies of 5 feldspar minerals with paracelsian topology (danburite, maleevite, pekovite, paracelsian, slawsonite) revealed that all of them are stable at least up to 800 °C. Among all of them only paracelsian undergoes polymorphic transition (at 930 °C), whereas all other minerals decompose or amorphisize. The structural deformations of these minerals demonstrate the different anisotropy degree upon heating, whereas the average volume expansion is similar for all of them (αV = 23 × 10–6 ºC–1). High-pressure behavior was studied for six of seven minerals with paracelsian topology (danburite, meleevite, pekovite, paracelsian, slawsonite, hurlbutite). The studied minerals undergo transformations with the stepwise increasing of coordination number of frame-forming cations from 4 to 5 and 6 upon compression The discovering of unusual structural units under extreme conditions (e.g., fivefold-coordinated polyhedral) can influence on the concentration and transport processes of trace elements that should be taken into account when interpreting geochemical and geophysical data. The crystal structure stability range of studied minerals highly depends on the chemical composition of frame-forming cations: aluminosilicates are the least stable and undergo the phase transitions below 6 GPa; borosilicates preserve their initial crystal structure up to ~20 GPa; beryllium phosphates do not undergo phase 2 transformations up to 75 GPa. It has been shown that transformations pathway of isostuctural compounds highly depends on the chemical composition of both extraframework and frame-forming cations that involves the difficulties with predictions of their behavior under extreme conditions.

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Hydroxylherderite (Ca₂Be₂P₂O₈(OH)₂) stability under extreme conditions (up to 750°C/100 GPa)

Cited by 4 publications

References 97 publications

Re-investigation of ‘minasgeraisite-(Y)’ from the Jaguaraçu pegmatite, Brazil and high-temperature crystal chemistry of gadolinite-supergroup minerals

Re-investigation of ‘minasgeraisite-(Y)’ from the Jaguaraçu pegmatite, Brazil and high-temperature crystal chemistry of gadolinite-supergroup minerals

Topotactic transformation of gadolinite‐ to melilite‐type structure revisited

Phase Transformations in Feldspar Group Minerals with Paracelsian Topology under High Temperature and High Pressure

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