Skip to main content Accessibility help
×
Home

Valence variations in titanium-based perovskite oxides by high-pressure and high-temperature method

  • Liping Li (a1), Guangshe Li (a2), Jipeng Miao (a1), Wenhui Su (a1) and Hiroshi Inomata (a2)...

Abstract

Typical titanium-based perovskite oxides Eu1−xBaxTiO3 (x = 0.6−0.8), Eu1−xKxTiO3 (x = 0.2,0.32), and La0.7 (Na,K)0.3TiO3 were synthesized by high pressure and temperature using RE2O3 (RE = La,Eu), TiO2, alkaline, or alkaline earth carbonates as the starting materials. X-ray diffraction data analysis showed that there was a structural transformation in Eu1−xBaxTiO3 by varying Ba content [i.e., from cubic (x = 0.6,0.7) to tetragonal (x = 0.8)], and that samples Eu1−xKxTiO3 and La0.7(Na,K)0.3TiO3 crystallized in the cubic perovskite structure. 151Eu Mössbauer spectroscopy and electron paramagnetic resonance measurements revealed mixed valence of Eu2+/Eu3+ in samples Eu1−xBaxTiO3 and Eu1−xKxTiO3, while Ti ions were present in pure Ti4+ state. Cubic Eu1−xKxTiO3 was metastable, which decomposed into a mixture of perovskite and pyrochlore phases at high temperatures as accompanied by an oxidation process from Eu2+ to Eu3+. For samples La0.7 (Na,K)0.3TiO3, Ti3+ signals were clearly observed. The reduction mechanisms for Eu ions at A site and Ti ions at B site in the perovskite oxides are discussed in terms of the chemical nature of the framework ions and substitution ions under high pressure and temperature.

Copyright

Corresponding author

a)Address all correspondence to this author. e-mail: guangshe@scf.che.tohoku.ac.jp

References

Hide All
1.Jayaraman, A., in Handbook on the Physics and Chemistry of Rare Earth, edited by Gschneidner, K.A. Jr., and Eyring, L. (North-Holland Amsterdam, 1978), p. 707.
2.Zhou, J., Chinese J. High Pressure Phys. 6, 7 (1992).
3.Gemazeau, G., and Buffat, B., Mater. Res. Bull. 16, 1465 (1981).
4.Choy, H., Demazeau, G., Dance, J.M., Byeon, S.H., and Muller, K.A., J. Solid State Chem. 109, 289 (1994).
5.Li, L., Wei, Q., Liu, H., Zheng, D., and Su, W., Z. Phys. B 96, 451 (1995).
6.Li, L., Li, G., Che, Y., and Su, W., Chem. Mater. 12, 2567 (2000).
7.Feng, S., Li, G., Li, L., and Li, X., Rev. High Pressure Sci. Technol. 7, 1362 (1998).
8.Hays, C.C., Zhou, J.S., Markert, J.T., and Goodenough, J.B., Phys. Rev. B 60, 10367 (1999).
9.Sunstrom, J.E. and Kauzlarich, S.M., Chem. Mater. 5, 1539 (1993).
10.Yamamoto, H., Tahara, T., Sugagara, Y., Kuroda, K., and Kato, C., Phase Transitions 41, 137 (1993).
11.McLune, W.F., editor, Powder Diffraction File: Inorganic Phases: JCPDS International Center for Powder Diffraction Data, Swarthmore, PA, Card No. 9–127, 34–596, 1989.
12.Anderson, M.T., Greenwood, K.B., Tailor, G.A., and Poeppelmeimer, K.R., Progr. Solid State Chem. 122, 197 (1993).
13.Li, L., Li, G., Song, X., and Su, W., Chin. Phys. Lett. 15, 925 (1998).
14.Su, W., Liu, X., Jin, M., Xu, W., Wu, D., and Liu, M., Phys. Rev. B 37, 35 (1988).
15.Croft, M., Hodges, J.A., Kemmly, E., Krishnan, A., Murgai, V., and Gupta, L.C., Phys. Rev. Lett. 48, 826 (1982).
16.Raffius, H., Mosel, B.D., Muller, W.W., Pegelow, U., Hadenfeldt, J.W., and Vomhof, T., J. Phys. Chem. Solids 55, 219 (1994).
17.Stadnik, Z.M., Stroink, G., and Arakawa, T., Phys. Rev. B 44, 12552 (1988).
18.Chien, C.L., DeBenedetli, S., and De S. Barros, F., Phys. Rev. B 10, 3913 (1974).
19.Gibb, T.C., J. Chem. Soc. Dalton. Trans. 2245 (1981).
20.Jin, M., Liu, X., Zhang, W., and Su, W., Solid State Commun. 76, 985 (1990).
21.Liu, X., Jin, M., and Liu, M., Hyperfine Interact. 68, 237 (1991).
22.Warren, W.L., Seager, C.H., Dimos, D., and Friebele, E.J., Appl. Phys. Lett. 61, 253 (1992).
23.Bykev, I.P., Glinchuk, M.D., Skorokhod, V.V., and Kurland, V.M., Ferroelectrics 127, 89 (1992);
Huang, J., Chasteen, N.D., and Fitzgerald, J.J., Chem. Mater. 10, 2848 (1998).
24.Li, L., Li, G., Smith, R.L. Jr., and Inomata, H., Chem. Mater. 12, 3705 (2000).
25.Van Fleck, J.H., Phys. Rev. 74, 1168 (1948).
26.Kutty, T.R.N., Murugaraj, P., and Gajbhiye, N.S., Mater. Res. Bull. 20, 565 (1985).
27.Kutty, T.R.N., Murugaraj, P., and Gajbhiye, N.S., Mater. Lett. 2, 396 (1984).
28.David, R.L., editor, CRC Handbook of Chemistry and Physics, 74th ed. (CRC Press, Boca Raton, FL), Table 8–21.
29.Bauminger, E.R., Diamant, A., Felver, I., Nowik, I., and Ofer, S., Phys. Lett. A50, 321 (1974).
30.Chien, C.L. and Sleight, A.W., Phys. Rev. B 18, 2031 (1978).

Valence variations in titanium-based perovskite oxides by high-pressure and high-temperature method

  • Liping Li (a1), Guangshe Li (a2), Jipeng Miao (a1), Wenhui Su (a1) and Hiroshi Inomata (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed