Article
Licensed
Unlicensed Requires Authentication

Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure

  • EMAIL logo and
Published/Copyright: January 7, 2016
Become an author with De Gruyter Brill
Author Information
American Mineralogist
From the journal American Mineralogist Volume 92 Issue 8-9

Abstract

The elastic behavior and the pressure-induced structural evolution of a natural nepheline (K0.54 Na3.24Ca0.03Al4Si4O16) were investigated by in-situ single-crystal X-ray diffraction up to 7.5 GPa with a diamond anvil cell under hydrostatic conditions. As observed in previous studies, at room conditions the diffraction pattern of nepheline includes satellite reflections, whereas the structure refinement to the Bragg reflections confirms that the O1 site is displaced from the triad at (2/3, 1/3, z). The reflection conditions confirm that the space group of the average structure of nepheline remains as P63 throughout the pressure range investigated, and no significant compression of the T-O bonds was measured up to 7.5 GPa. As pressure was increased to around 1 GPa the integrated intensities of the satellites decreased slightly, and at 1.8 GPa no significant intensity of the satellites was detected. Over the same pressure range the O1 site moved toward the triad and thus the tilts of the T1 and T2 tetrahedra decreased. The presence of the subsidiary non-Bragg reflections is therefore related to the split of the O1 site. When the satellites disappear at pressures above 2 GPa, the O1 site is on the triad at (2/3, 1/3, z), corresponding to a straight T1-O1-T2 bond. Below 2 GPa the structure responds to increased pressure by tilting of all four tetrahedra and above 2 GPa by tilting of the T3 and T4 tetrahedra alone. The change in compression mechanism arising from the changes in the O1 position is associated with changes in the compression of the unit-cell axes and the unit-cell volume. The volume can be described by fourth-order Birch-Murnaghan equation-of-state with parameters V0+ = 723.57(4) Å3, KT0 = 47.32(26) GPa, K’ = 2.77(24), and K’’ = 0.758(79) GPa-1. The elastic behavior along the a- and c-axis can be described with a “linearized” fourth-order Birch-Murnaghan equations-of-state, with the following refined parameters: a0 = 9.9911(2) Å, KT0(a) = 43.1(3) GPa, K’(a) = 2.5(3), and K’’(a) = 0.68(8) GPa-1 for the a-axis and c0 = 8.3700(1) Å, KT0(c) = 58.6(3) GPa, K’(c) = 4.0(3), and K’’(c) = 0.85(11) GPa-1 for the c-axis. The pressure-induced structural evolution in nepheline up to 7.5 GPa appears to be completely reversible. The recovery of the modulation upon complete pressure release points to the framework of nepheline having an instability corresponding to a rigid-unit mode with a wave vector corresponding to the observed positions of the satellite reflections

Keywords: Crystal structure; nepheline; modulated structure; XRD data; single crystal; high pressure; compressibility; structural evolution
Received: 2006-11-7
Accepted: 2007-3-21
Published Online: 2016-1-7
Published in Print: 2007-8-1

© 2016 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Occurrence and origin of minerals in a chamosite-bearing coal of Late Permian age, Zhaotong, Yunnan, China
  2. Crystal-chemical and carbon-isotopic characteristics of karpatite (C24H12) from the Picacho Peak Area, San Benito County, California: Evidences for the hydrothermal formation
  3. Single-crystal X-ray diffraction study of high-pressure phases of KHCO3
  4. Stress-induced redistribution of yttrium and heavy rare-earth elements (HREE) in garnet during high-grade polymetamorphism
  5. The role of volatile transport by diffusion and dispersion in driving biotite-forming reactions during regional metamorphism of the Gile Mountain Formation, Vermont
  6. Laser Raman microspectrometry of metamorphic quartz: A simple method for comparison of metamorphic pressures
  7. Al,Si order in albite and its effect on albite dissolution processes: A Monte Carlo study
  8. Structural state of microcrystalline opals: A Raman spectroscopic study
  9. A Monte Carlo investigation of the thermodynamics of cation ordering in 2-3 spinels
  10. Modeling the plastic deformation of olivine by dislocation dynamics simulations
  11. Heat capacity of hydration in zeolites
  12. Imaging of dioctahedral 2:1 layers by high-resolution transmission electron microscopy (HRTEM): Possibility of recording the dehydroxylate
  13. Geochemical variations in late-stage growth of volcanic phenocrysts revealed by SIMS depth-profiling
  14. Characterization of mineral surfaces using FIB and TEM: A case study of naturally weathered alkali feldspars
  15. Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas
  16. Microbial effects in promoting the smectite to illite reaction: Role of organic matter intercalated in the interlayer
  17. Microbial reduction of structural Fe3+ in nontronite by a thermophilic bacterium and its role in promoting the smectite to illite reaction
  18. Unique properties of lunar impact glass: Nanophase metallic Fe synthesis
  19. Aluminotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry
  20. Pressure-induced slip-system transition in forsterite: Single-crystal rheological properties at mantle pressure and temperature
  21. Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure
  22. Pressure-induced change in the compressional behavior of the O-H bond in chrysotile: A Raman high-pressure study up to 4.5 GPa
  23. Jarosite-hydronium jarosite solid-solution series with full iron site occupancy: Mineralogy and crystal chemistry
  24. Hydrogen bonded silanols in the 10 Å phase: Evidence from NMR spectroscopy
  25. Mössbauer spectroscopy of Zn-poor and Zn-rich rhodonite
  26. The crystal structure of pyroxenes along the jadeite hedenbergite and jadeite aegirine joins
  27. Temperature dependence of IR absorption of hydrous/hydroxyl species in minerals and synthetic materials
  28. The crystal structure of meurigite
  29. Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure
  30. Letter. Novel 2:1 structure of phyllosilicates formed by annealing Fe3+, Mg-rich dioctahedral mica
  31. Letter. Experimental study of radium partitioning between anorthite and melt at 1 atm
https://doi.org/10.2138/am.2007.2501
Keywords for this article
Crystal structure; nepheline; modulated structure; XRD data; single crystal; high pressure; compressibility; structural evolution

Articles in the same Issue

  1. Occurrence and origin of minerals in a chamosite-bearing coal of Late Permian age, Zhaotong, Yunnan, China
  2. Crystal-chemical and carbon-isotopic characteristics of karpatite (C24H12) from the Picacho Peak Area, San Benito County, California: Evidences for the hydrothermal formation
  3. Single-crystal X-ray diffraction study of high-pressure phases of KHCO3
  4. Stress-induced redistribution of yttrium and heavy rare-earth elements (HREE) in garnet during high-grade polymetamorphism
  5. The role of volatile transport by diffusion and dispersion in driving biotite-forming reactions during regional metamorphism of the Gile Mountain Formation, Vermont
  6. Laser Raman microspectrometry of metamorphic quartz: A simple method for comparison of metamorphic pressures
  7. Al,Si order in albite and its effect on albite dissolution processes: A Monte Carlo study
  8. Structural state of microcrystalline opals: A Raman spectroscopic study
  9. A Monte Carlo investigation of the thermodynamics of cation ordering in 2-3 spinels
  10. Modeling the plastic deformation of olivine by dislocation dynamics simulations
  11. Heat capacity of hydration in zeolites
  12. Imaging of dioctahedral 2:1 layers by high-resolution transmission electron microscopy (HRTEM): Possibility of recording the dehydroxylate
  13. Geochemical variations in late-stage growth of volcanic phenocrysts revealed by SIMS depth-profiling
  14. Characterization of mineral surfaces using FIB and TEM: A case study of naturally weathered alkali feldspars
  15. Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas
  16. Microbial effects in promoting the smectite to illite reaction: Role of organic matter intercalated in the interlayer
  17. Microbial reduction of structural Fe3+ in nontronite by a thermophilic bacterium and its role in promoting the smectite to illite reaction
  18. Unique properties of lunar impact glass: Nanophase metallic Fe synthesis
  19. Aluminotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry
  20. Pressure-induced slip-system transition in forsterite: Single-crystal rheological properties at mantle pressure and temperature
  21. Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure
  22. Pressure-induced change in the compressional behavior of the O-H bond in chrysotile: A Raman high-pressure study up to 4.5 GPa
  23. Jarosite-hydronium jarosite solid-solution series with full iron site occupancy: Mineralogy and crystal chemistry
  24. Hydrogen bonded silanols in the 10 Å phase: Evidence from NMR spectroscopy
  25. Mössbauer spectroscopy of Zn-poor and Zn-rich rhodonite
  26. The crystal structure of pyroxenes along the jadeite hedenbergite and jadeite aegirine joins
  27. Temperature dependence of IR absorption of hydrous/hydroxyl species in minerals and synthetic materials
  28. The crystal structure of meurigite
  29. Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure
  30. Letter. Novel 2:1 structure of phyllosilicates formed by annealing Fe3+, Mg-rich dioctahedral mica
  31. Letter. Experimental study of radium partitioning between anorthite and melt at 1 atm
Downloaded on 8.4.2026 from https://www.degruyterbrill.com/document/doi/10.2138/am.2007.2501/html
Scroll to top button