Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-10T04:30:41.619Z Has data issue: false hasContentIssue false
  • English
  • Français

Nuclear magnetic resonance investigations of the structural phase transitions of AlPO4 tridymite

Published online by Cambridge University Press:  03 March 2011

Yuehui Xiao  and
R. James Kirkpatrick
Yuehui Xiao
Affiliation:
Department of Geology, University of Illinois, 1301 West Green Street, 245 Natural History Building. Urbana, Illinois 61801
R. James Kirkpatrick
Affiliation:
Department of Geology, University of Illinois, 1301 West Green Street, 245 Natural History Building. Urbana, Illinois 61801
Get access

Abstract

27Al and 31P NMR spectroscopic data are presented for the tridymite polymorph of AlPO4 (AlPO4−1) through its structural phase transition at about 80 °C. The RT 27Al and 31P spectra of AlPO4−t both contain doublets of broad peaks, indicating two well-separated groups of sites in the RT structure with mean Al-O-P bond angles per tetrahedron of ∼ 147.8°and 153.1°(±1). With increasing temperature, the doublets remain the same up to about 74 °C, where the relative intensities of the two peaks start to change. The peak corresponding to smaller Al-O-P bond angles disappears, and above ∼88 °C the 27Al and 31P spectra contain single symmetrical peaks, corresponding to a mean Al-O-P bond angle of 153.4°. This bond angle increases gradually with increasing temperature to 153.7°at ∼150 °C and remains constant to about 500 °C. 27Al quadrupole echo experiments suggests that the 27Al nuclear quadrupole coupling constant (QCC) is small and decreases with increasing temperature. QCC remains nonzero in the high temperature phase of AlPO4−t, consistent with the previously proposed 3m local symmetry of Al in the high-temperature structure.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2586 - 2591
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Gruner, J. W., Bull. Geol. Soc. Am. 50(12), 1163 (1945).Google Scholar
2Beck, W. R., J. Am. Ceram. Soc. 32(4), 147–151 (1949).CrossRefGoogle Scholar
3Sanz, J., Campelo, J. M., and Marinas, J.M., J. Catalysis 130, 642–652 (1991).CrossRefGoogle Scholar
4Debnath, R. and Chaudhuri, J., J. Solid State Chemistry 97, 163–168 (1992).Google Scholar
5Liang, R. and Nakamura, T., Mater. Res. Bull. XX, 1253–1256 (1985).CrossRefGoogle Scholar
6Hoffmann, W., Kockmeyer, M., Löns, J., and Vach, C., Fortsch Mineral 61, 96–98 (1983).Google Scholar
7Xiao, Y., Kirkpatrick, R. J., and Kim, Y. J., Investigations of MX-1 Tridymite by 29Si MAS NMR-Modulated Structures and Structural Phase Transitions, Phys. Chem. Minerals 22, 30–40 (1995).Google Scholar
8Graetsch, H. and Flörke, O. W., Z. Kristallogr. 195, 31–48 (1991).CrossRefGoogle Scholar
9Xiao, Y., Kirkpatrick, R. J., and Kim, Y. J., Am. Mineralogist 78, 241–244 (1993).Google Scholar
10Phillips, B. L., Thompson, J. G., Xiao, Y., and Kirkpatrick, R.J., Phys. Chem. Minerals 20, 341–352 (1993).CrossRefGoogle Scholar
11Samoson, A. and Lippmaa, E., Phys. Rev. B 28, 6567–6570 (1983).Google Scholar
12Weisman, I. D. and Bennett, L. H., Phys. Rev. 181, 1341–1350 (1969).CrossRefGoogle Scholar
13Lee, N., Sanctuary, B. C., and Halstead, T.K, J. Magn. Reson. 98, 534–555 (1992).Google Scholar
14Solomon, I., Phys. Rev. 110, 61–65 (1958).CrossRefGoogle Scholar
15Abragam, A., Principles of Nuclear Magnetism (Oxford University Press, Oxford, 1961).Google Scholar
16Müller, D., Jahn, E., Ladwig, G., and Haubenreisser, U., Chem. Phys. Lett. 109, 332–336 (1984).CrossRefGoogle Scholar
17Xiao, Y. and Kirkpatrick, R. J., unpublished research.Google Scholar