Startseite Pressure-induced transformation processes in ferroelastic Pb3(P1–xAsxO4)2, x = 0 and 0.80
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Pressure-induced transformation processes in ferroelastic Pb3(P1–xAsxO4)2, x = 0 and 0.80

  • Boriana Mihailova EMAIL logo , Ross J. Angel EMAIL logo , Naemi Waeselmann , Bernd J. Maier , Carsten Paulmann und Ulrich Bismayer
Veröffentlicht/Copyright: 1. September 2015
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Zeitschrift für Kristallographie - Crystalline Materials
Aus der Zeitschrift Zeitschrift für Kristallographie - Crystalline Materials Band 230 Heft 9-10

Abstract

The high-pressure behaviour of two representative palmierite-type Pb3(PxAs1–xO4)2 ferroelastic compounds with x = 0 and 0.80 was analyzed by combined single-crystal X-ray diffraction and Raman spectroscopy. Single-crystal diffraction measurements on the As-rich compound Pb3(P0.20As0.80O4)2 show that it undergoes the same macroscopic monoclinic to trigonal phase transition as previously observed in pure Pb3(PO4)2 but with a significantly lower transition pressure, pc = 0.90(4) GPa for x = 0.80 as opposed to pc = 1.81(1) for x = 0.0. Synchrotron X-ray diffraction experiments reveal that both compounds exhibit significant diffuse scattering in a pressure interval of ~1.5 GPa above the corresponding pressure-induced transitions, indicating the persistence of monoclinic nanodomains within the macroscopically trigonal phase above the phase-transition point, similar to the high-temperature structural state. Raman spectroscopy reveal quite distinct lattice dynamics for x = 0 and x = 0.80, indicating different pathways of pressure-driven structural alteration. The pure phosphate compound shows a displacive phase transition of thermodynamically second-order type, whereas the As-rich compound exhibits an order-disorder phase transition with multistep structural changes on the mesoscopic scale. The pressure evolution of the Pb phonon modes as well as the broadening of the X-ray diffraction peaks suggests a further pressure-induced phase transition occurring in the range 5–7 GPa for Pb3(P0.20As0.80O4)2, whilst no indication for a second phase transition up to 10 GPa was observed for Pb3(PO4)2.

Keywords: ferroelastic solid solutions; high pressure; phase transitions; Raman spectroscopy; X-ray diffraction
Corresponding authors: Boriana Mihailova, Department Geowissenschaften, Universität Hamburg, 20146 Hamburg, Germany, E-mail: ; and Ross J. Angel, Department Geowissenschaften, Universität Hamburg, 20146 Hamburg, Germany; and Dipartimento di Geoscienze, Universita degli studi di Padova, via G. Gradenigo 6, 35131 Padova, Italy, E-mail:

Acknowledgments

Financial support by the Deutsche Forschungsgemeinschaft (INST 152/526-1) in the form of a Mercator Professorship and the Fondazione Cariparo (Fondazione Cassa di Risparmio di Padova e Rovigo) is gratefully acknowledged.

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Published Online: 2015-9-1
Published in Print: 2015-9-1

©2015 by De Gruyter

Artikel in diesem Heft

  1. Frontmatter
  2. Graphical Synopsis
  3. Review Article
  4. Visualization and analysis of crystal structures using CrystalMaker software
  5. Inorganic Crystal Structures
  6. [NaCl][Cu(HSeO3)2], NaCl-intercalated Cu(HSeO3)2: synthesis, crystal structure and comparison with related compounds
  7. Intermediate-valent CeCoAl – a commensurate modulated structure with short Ce–Co distances
  8. Pressure-induced transformation processes in ferroelastic Pb3(P1–xAsxO4)2, x = 0 and 0.80
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  10. Organic and Metalorganic Crystal Structures
  11. Determination of crystal structures and tautomeric states of 2-ammoniobenzenesulfonates by laboratory X-ray powder diffraction
  12. [Fe(PNN-iPr)Br2]·xDCM: the first example of merotype-epitaxy of a molecular structure and its solvatomorph
https://doi.org/10.1515/zkri-2015-1851
Schlagwörter für diesen Artikel
ferroelastic solid solutions; high pressure; phase transitions; Raman spectroscopy; X-ray diffraction

Artikel in diesem Heft

  1. Frontmatter
  2. Graphical Synopsis
  3. Review Article
  4. Visualization and analysis of crystal structures using CrystalMaker software
  5. Inorganic Crystal Structures
  6. [NaCl][Cu(HSeO3)2], NaCl-intercalated Cu(HSeO3)2: synthesis, crystal structure and comparison with related compounds
  7. Intermediate-valent CeCoAl – a commensurate modulated structure with short Ce–Co distances
  8. Pressure-induced transformation processes in ferroelastic Pb3(P1–xAsxO4)2, x = 0 and 0.80
  9. Disorder, pseudo symmetry and photoluminescence properties of a new diphosphate K2Ba3(P2O7)2
  10. Organic and Metalorganic Crystal Structures
  11. Determination of crystal structures and tautomeric states of 2-ammoniobenzenesulfonates by laboratory X-ray powder diffraction
  12. [Fe(PNN-iPr)Br2]·xDCM: the first example of merotype-epitaxy of a molecular structure and its solvatomorph
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