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Structural investigation of two synthetic warwickites: Undistorted orthorhombic MgScOBO3 and distorted monoclinic Mg0.76Mn1.24OBO3

Published/Copyright: August 25, 2010
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Zeitschrift für Kristallographie
From the journal Zeitschrift für Kristallographie Volume 189 Issue 1-2

Abstract

The Mg – Sc warwickite, MgScOBO3, is an example of a normal orthorhombic warwickite [Pnam, a = 9.490(1), b = 9.422(1), c = 3.2189(4) Å and Z = 4]. The structure has been refined to an R value of 0.043, using the 258 X-ray reflection intensities with I > 3 · σ(I) and sin θ/λ ≤ 0.63 Å−1. The ratios of divalent to trivalent ions (Mg2+:Sc3+) at the two different metal sites are about 1:3 and 3:1, respectively. The investigation yields improved structural data for the common warwickite structure type. The Mg – Mn warwickite, Mg0.76Mn1.24OBO3, represents the first example of a distorted warwickite structure [P21/a, a = 9.370(2), b = 9.279(2), c = 3.181(1) Å, β = 85.65(2)° and Z = 4]. The derived structural model has been refined to an R value of 0.048 for the 385 X-ray reflection intensities with I > 3 · σ(I) and sin θ/λ ≤ 0.65 Å−1. The lowering of the symmetry, from orthorhombic for normal warwickites to monoclinic, is apparently due to structural effects caused by the Mn3+ ions. The coordination octahedra around the main Mn3+ sites are elongated with four shorter coplanar Mn – O bonds of 1.88 to 1.99 Å and two longer ones of 2.25 and 2.34 Å. The distributions of divalent and trivalent ions in the metal positions are similar to those in common warwickites.

Published Online: 2010-08-25
Published in Print: 1989

Articles in the same Issue

  1. Structural investigation of two synthetic warwickites: Undistorted orthorhombic MgScOBO3 and distorted monoclinic Mg0.76Mn1.24OBO3
  2. A redetermination of the crystal structure of cupric chloride dihydrate
  3. Crystal data and crystal structure for silver cyclohexaphosphate monohydrate: Ag6P6O18 · H2O
  4. On the microstructure of a rapidly quenched Mn4Si alloy
  5. Structural investigation of two synthetic oxyborates: The mixed magnesium-manganese and the pure cobalt ludwigites, Mg1.93(2)Mn1.07(2)O2BO3 and Co3O2BO3
  6. Crystal chemistry of natural Mn3+-bearing calderite-andradite garnets from Otjosondu, SWA/Namibia
  7. The crystal structure of bis(sulfonylophenylo)diiodomethane, C13H10I2O4S2
  8. Crystal structure of cyclic dehydroaminoacid derivatives
  9. Structure of BaCuInF7: The interpretation between a pyrochlore-like edge-sharing network of octahedra and a defect fluorite structure
  10. The crystal structure of 5-hydroxy-7-methoxyflavanone
  11. Die Physik der nichtkristallinen Stoffe dargestellt durch Mikroparakristalle
  12. Comments on the valence rule by Nesper and von Schnering
  13. The crystal and molecular structure of 9,10-dimethylphenanthrene
  14. The crystal structure of Zr2P
  15. The crystal structure of Cu(II)-bis[1-(2-pyridinyl)-2-propanonato-N,O]
  16. A comparative study of the crystal structures of Ba(ClO3)2, Ba(BrO3)2 II, Pb(ClO3)2, and Sr(ClO3)2
  17. Crystal structure of guanidinium nitroprusside, [CN3H6]2[Fe(CN)5NO], and barium nitroprusside trihydrate, Ba[Fe(CN)5NO] · 3H2O
  18. Crystal structure refinement of Zr7P4
  19. Kristallzüchtung
  20. Classical Tessellations and Three-Manifolds
  21. Festkörperphysik. Eine Einführung in die Grundlagen
  22. Reliability in Non-Destructive Testing
  23. Alumina Extraction from Non Bauxitic Materials
  24. Crystallographic Computing 4. Techniques and New Technologies
https://doi.org/10.1524/zkri.1989.189.1-2.1

Articles in the same Issue

  1. Structural investigation of two synthetic warwickites: Undistorted orthorhombic MgScOBO3 and distorted monoclinic Mg0.76Mn1.24OBO3
  2. A redetermination of the crystal structure of cupric chloride dihydrate
  3. Crystal data and crystal structure for silver cyclohexaphosphate monohydrate: Ag6P6O18 · H2O
  4. On the microstructure of a rapidly quenched Mn4Si alloy
  5. Structural investigation of two synthetic oxyborates: The mixed magnesium-manganese and the pure cobalt ludwigites, Mg1.93(2)Mn1.07(2)O2BO3 and Co3O2BO3
  6. Crystal chemistry of natural Mn3+-bearing calderite-andradite garnets from Otjosondu, SWA/Namibia
  7. The crystal structure of bis(sulfonylophenylo)diiodomethane, C13H10I2O4S2
  8. Crystal structure of cyclic dehydroaminoacid derivatives
  9. Structure of BaCuInF7: The interpretation between a pyrochlore-like edge-sharing network of octahedra and a defect fluorite structure
  10. The crystal structure of 5-hydroxy-7-methoxyflavanone
  11. Die Physik der nichtkristallinen Stoffe dargestellt durch Mikroparakristalle
  12. Comments on the valence rule by Nesper and von Schnering
  13. The crystal and molecular structure of 9,10-dimethylphenanthrene
  14. The crystal structure of Zr2P
  15. The crystal structure of Cu(II)-bis[1-(2-pyridinyl)-2-propanonato-N,O]
  16. A comparative study of the crystal structures of Ba(ClO3)2, Ba(BrO3)2 II, Pb(ClO3)2, and Sr(ClO3)2
  17. Crystal structure of guanidinium nitroprusside, [CN3H6]2[Fe(CN)5NO], and barium nitroprusside trihydrate, Ba[Fe(CN)5NO] · 3H2O
  18. Crystal structure refinement of Zr7P4
  19. Kristallzüchtung
  20. Classical Tessellations and Three-Manifolds
  21. Festkörperphysik. Eine Einführung in die Grundlagen
  22. Reliability in Non-Destructive Testing
  23. Alumina Extraction from Non Bauxitic Materials
  24. Crystallographic Computing 4. Techniques and New Technologies
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