Compressibility of stottite, FeGe(OH)6: An octahedral framework with protonated O atoms
-
Nancy L. Ross
,
Tracey D. Chaplin
Abstract
The evolution of the unit-cell parameters of stottite [FeGe(OH)6], a compound with a tetragonal octahedral framework related to the perovskite structure, has been determined to a maximum pressure of 7.8 GPa by single-crystal X-ray diffraction at room temperature. Stottite does not exhibit any phase transitions in this pressure range. A fit of a third-order Birch-Murnaghan equation of state to the pressure-volume data yields values of V0 = 425.67(2) Å3, KT0 = 78.4(3) GPa and K0' = 6.18(10). Analysis of the unit-cell parameter data shows that c is approximately 10% more compressible a. Compressional moduli for the axes are Ka0 = 81.3(3) GPa and K'a0 = 6.4(1), Kc0 = 73.3(6) GPa and K'c 0 = 5.7(2). We relate these axial compressibilities to the structure of stottite, which, unlike related cubic protonated octahedral frameworks such as burtite [CaSn(OH)6], is expected to have a highly anisotropic hydrogen-bonding topology: a high degree of hydrogen-bonded connectivity parallel to (001) and very little parallel to [001]. Enhanced hydrogen bonding within the (001) plane may stiffen the structure along <100>. We also make some provisional comparisons with structural and elasticity data for perovskites and show that the absence of a central, non-framework cation in the stottite structure allows octahedral tilts in excess of 40°. The stottite structure is much softer than any known oxide perovskite. The relative importance of an empty cavity site vs. the role of hydrogen bonding is likely to be a major issue in understanding the compressional behavior of protonated octahedral frameworks.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Atomic-scale observations of franckeite surface morphology
- Surface control vs. diffusion control during calcite dissolution: Dependence of step-edge velocity upon solution pH
- First-principles calculation of the infrared spectrum of lizardite
- Hard-mode infrared spectroscopy of perovskites across the CaTiO3-SrTiO3 solid solution
- Spectroscopic studies of spessartine from Brazilian pegmatites
- Order/disorder in natrolite group zeolites: A 29Si and 27Al MAS NMR study
- Evolution of local electronic structure in alabandite and niningerite solid solutions [(Mn,Fe)S, (Mg,Mn)S, (Mg,Fe)S] using sulfur K- and L-edge XANES spectroscopy
- Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part III. Structural characterization of sub-ppm-level Gd and Mn in minerals at W-band frequency
- Experimental determination of the equilibria: rutile + magnesite = geikielite + CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2
- Symplectites derived from metastable phases in martian basaltic meteorites
- Copper speciation in vapor-phase fluid inclusions from the Mole Granite, Australia
- Trace-element partitioning between vacancy-rich eclogitic clinopyroxene and silicate melt
- Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile
- Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India
- Temperatures from triple-junction angles in sulfides
- Experimental determination of calcite solubility in H2O-NaCl solutions at deep crust/ upper mantle pressures and temperatures: Implications for metasomatic processes in shear zones
- Compressibility of stottite, FeGe(OH)6: An octahedral framework with protonated O atoms
- High-pressure behavior of bikitaite: An integrated theoretical and experimental approach
- Raman spectroscopic study of H2O in bikitaite: “One-dimensional ice”
- Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions
- Crystal chemistry of three tourmalines by SREF, EMPA, and SIMS
- Revised structure models for antigorite: An HRTEM study
- The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral
- Single-crystal structure refinements and crystal chemistry of synthetic trioctahedral micas KM3(Al3+,Si4+)4O10(OH)2, where M = Ni2+, Mg2+, Co2+, Fe2+, or Al3+
- SIMS matrix effects in the analysis of light elements in silicate minerals: Comparison with SREF and EMPA data
- Letters. Equation of state of Al-bearing stishovite to 40 GPa at 300 K
- Order parameter behavior at the structural phase transition in cummingtonite from Mössbauer spectroscopy
- Deciphering Ni sequestration in soil ferromanganese nodules by combining X-ray fluorescence, absorption, and diffraction at micrometer scales of resolution
- Use of the spindle stage for orientation of single crystals for microXAS: Isotropy and anisotropy in Fe-XANES spectra
- A technique for mounting and polishing melt inclusions in small (<1 mm) crystals
Articles in the same Issue
- Atomic-scale observations of franckeite surface morphology
- Surface control vs. diffusion control during calcite dissolution: Dependence of step-edge velocity upon solution pH
- First-principles calculation of the infrared spectrum of lizardite
- Hard-mode infrared spectroscopy of perovskites across the CaTiO3-SrTiO3 solid solution
- Spectroscopic studies of spessartine from Brazilian pegmatites
- Order/disorder in natrolite group zeolites: A 29Si and 27Al MAS NMR study
- Evolution of local electronic structure in alabandite and niningerite solid solutions [(Mn,Fe)S, (Mg,Mn)S, (Mg,Fe)S] using sulfur K- and L-edge XANES spectroscopy
- Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part III. Structural characterization of sub-ppm-level Gd and Mn in minerals at W-band frequency
- Experimental determination of the equilibria: rutile + magnesite = geikielite + CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2
- Symplectites derived from metastable phases in martian basaltic meteorites
- Copper speciation in vapor-phase fluid inclusions from the Mole Granite, Australia
- Trace-element partitioning between vacancy-rich eclogitic clinopyroxene and silicate melt
- Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile
- Thermal stability and spectroscopic studies of zemkorite: A carbonate from the Venkatampalle kimberlite of southern India
- Temperatures from triple-junction angles in sulfides
- Experimental determination of calcite solubility in H2O-NaCl solutions at deep crust/ upper mantle pressures and temperatures: Implications for metasomatic processes in shear zones
- Compressibility of stottite, FeGe(OH)6: An octahedral framework with protonated O atoms
- High-pressure behavior of bikitaite: An integrated theoretical and experimental approach
- Raman spectroscopic study of H2O in bikitaite: “One-dimensional ice”
- Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions
- Crystal chemistry of three tourmalines by SREF, EMPA, and SIMS
- Revised structure models for antigorite: An HRTEM study
- The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral
- Single-crystal structure refinements and crystal chemistry of synthetic trioctahedral micas KM3(Al3+,Si4+)4O10(OH)2, where M = Ni2+, Mg2+, Co2+, Fe2+, or Al3+
- SIMS matrix effects in the analysis of light elements in silicate minerals: Comparison with SREF and EMPA data
- Letters. Equation of state of Al-bearing stishovite to 40 GPa at 300 K
- Order parameter behavior at the structural phase transition in cummingtonite from Mössbauer spectroscopy
- Deciphering Ni sequestration in soil ferromanganese nodules by combining X-ray fluorescence, absorption, and diffraction at micrometer scales of resolution
- Use of the spindle stage for orientation of single crystals for microXAS: Isotropy and anisotropy in Fe-XANES spectra
- A technique for mounting and polishing melt inclusions in small (<1 mm) crystals
