Weakley, T. J. R., Ylvisaker, E. R., Yager, R. J., Stephens, J. E., Wiegel, R. D., Mengis, M., Bauer, M. R., Wu, P., Photinos, P., Abrahams, S. C. (2004) Phase transitions in K2Cr2O7 and structural redeterminations of phase II. Acta Crystallographica Section B Structural Science, 60 (6). 705-715 doi:10.1107/s010876810402333x
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Phase transitions in K2Cr2O7 and structural redeterminations of phase II | ||
| Journal | Acta Crystallographica Section B Structural Science | ||
| Authors | Weakley, T. J. R. | Author | |
| Ylvisaker, E. R. | Author | ||
| Yager, R. J. | Author | ||
| Stephens, J. E. | Author | ||
| Wiegel, R. D. | Author | ||
| Mengis, M. | Author | ||
| Bauer, M. R. | Author | ||
| Wu, P. | Author | ||
| Photinos, P. | Author | ||
| Abrahams, S. C. | Author | ||
| Year | 2004 (November 11) | Volume | 60 |
| Page(s) | 705-715 | Issue | 6 |
| Publisher | International Union of Crystallography (IUCr) | ||
| URL | |||
| DOI | doi:10.1107/s010876810402333xSearch in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 188093 | Long-form Identifier | mindat:1:5:188093:3 |
| GUID | 0 | ||
| Full Reference | Weakley, T. J. R., Ylvisaker, E. R., Yager, R. J., Stephens, J. E., Wiegel, R. D., Mengis, M., Bauer, M. R., Wu, P., Photinos, P., Abrahams, S. C. (2004) Phase transitions in K2Cr2O7 and structural redeterminations of phase II. Acta Crystallographica Section B Structural Science, 60 (6). 705-715 doi:10.1107/s010876810402333x | ||
| Plain Text | Weakley, T. J. R., Ylvisaker, E. R., Yager, R. J., Stephens, J. E., Wiegel, R. D., Mengis, M., Bauer, M. R., Wu, P., Photinos, P., Abrahams, S. C. (2004) Phase transitions in K2Cr2O7 and structural redeterminations of phase II. Acta Crystallographica Section B Structural Science, 60 (6). 705-715 doi:10.1107/s010876810402333x | ||
| In | (2004, December) Acta Crystallographica Section B Structural Science Vol. 60 (6) International Union of Crystallography (IUCr) | ||
| Abstract/Notes | Crystals of phase II K2Cr2O7, potassium dichromate, space group P\overline 1, grown from aqueous solution undergo a first-order transition to phase I, space group reportedly P21/n, at a phase-transition temperature, T PT, of 544 (2) K on first heating; the corresponding transition on cooling is at 502 (2) K. The endotherm on subsequent heatings occurs reproducibly at T PT = 531 (2) K. Mass loss between ca 531 and 544 K, identified as included water, is rapid and continues more slowly to higher temperatures for a total loss of ca 0.20%. The higher T PT on first heating is associated with the increasing pressure of superheated water occupying inclusion defects. The latent diagonal glide plane in phase II allows the structure of phase I to be inferred. The triclinic structure at 296 K has been independently redetermined. Normal probability analysis shows high consistency between the resulting and previous atomic coordinates, but with uncertainties reduced by a factor of ca 2. The earlier uncertainties are systematically underestimated by a comparable factor. The structure of phase IIb, space group A2/a on transposing axes, was determined at ca 300 K by Krivovichev et al. [Acta Cryst. (2000), C56, 629–630]. The first-order transition between phases I and II arises from the ca 60° relative rotation of terminal O atoms in each tetrahedron as the n glide plane is gained or lost. A transition between phases IIb and I, also of first order, is likely but not between phases II and IIb. An intermediate phase may exist between phases IIb and I. | ||
Mineral Pages
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| Lópezite |
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