Abstract
We performed a simulation of the chemical fluctuation regions in the lead-magnesium-niobate-like relaxors by growing Pb x Nb y O z ceramics. The coexistence of Pb x Nb y O z clusters with different chemical composition that is inclusive of Nb5+ as well as Nb3+ ions was assumed. The existence of mobile polaronic pseudo-Jahn-Teller holes on the oxygen ions in different Pb x Nb y O z clusters has been suggested by the electron paramagnetic resonance (EPR) experiment. Here light- induced EPR and EPR motional averaging effects related with such polaronic holes have been manifested. The appearance of new paramagnetic centers (S=5/2, 3/2, 1/2) related with Cr3+ impurities at the Nb5+ sites with trapped hole pairs (hole bipolarons), the charge compensation and the exchange effect have been proposed as explanation for the results of the EPR experiment. The charge-transfer vibronic excitons with O → Nb5+ charge transfer were directly detected by photoluminescence studies. The R-line in the Cr3+ impurity photoluminescence evidences the appearance of the Cr3+ ion in such matrices.
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References
Smolenskii G.A., Isupov V.A., Agranovskaya A.I., Popov S.N.: Sov. Phys. Solid State2, 2584–2594 (1960)
Cross L.E.: Ferroelectrics76, 241 (1987)
Pirc R., Blinc R.: Phys. Rev. B60, 13470–13476 (1999)
Westphal V., Kleemann W., Glinchuk M.D.: Phys. Rev. Lett.68, 847 (1992)
Cross L.E.: Ferroelectrics151, 305 (1994)
Yan Y., Pennycook S.J., Xu, Z., Viehland D.: Appl. Phys. Lett.72, 3145 (1998)
Egami T.: Ferroelectrics222, 163 (1999)
Tkachuk A., Zschack P., Colla E., Chen H. in: Fundamental Physics of Ferroelectrics 2001: 11th Williamsburg Ferroelectrics Workshop (Krakauer H., ed.), American Institute of Physics Conference Proceedings, vol. 582, p. 45. Melville, N.Y.: American Institute of Physics 2001.
Vikhnin V.S.: Solid State Commun.127, 283–288 (2003)
Vikhnin V.S., Eglitis R.I., Kapphan S.E., Borstel G., Kotomin E.A.: Phys. Rev. B65, 104304 (2002)
Vikhnin V.S., Eglitis R.I., Kapphan S.E., Kotomin E.A., Borstel G.: Europhys. Lett.56, 702 (2001)
Vikhnin V.S., Blinc R., Pirc R., Kapphan S.E., Kislova I.L., Markovin P.A.: Ferroelectrics268, 257–262 (2002)
Vikhnin V.S., Blinc R., Pirc R., Kapphan S.E. in: Fundamental Physics of Ferroelectrics 2001: 11th Williamsburg Ferroelectrics Workshop (Krakauer H., ed.), American Institute of Physics Conference Proceedings, vol. 582. Melville, N.Y.: American Institute of Physics 2001.
Vikhnin V.S., Blinc R., Pirc R.: J. Appl. Phys.93, 9947–9952 (2003)
Vikhnin V.S., Eglitis R.I., Kotomin E.A., Kapphan S.E., Borstel G. in: Fundamental Physics of Ferroelectrics 2001: 11th Williamsburg Ferroelectrics Workshop (Krakauer H. ed.), American Institute of Physics Conference Proceedings, vol. 582, p. 28. Melville, N.Y.: American Institute of Physics 2001.
Lebedeva N.N., Mamedov A.M., Mordukhaev A.R.: Ferroelectrics34, 101–104 (1981)
Trepakov V.A., Babinsky A.V., Kraynik N.N., Smolensky G.A., Samuchin A.N.: Pis’ma ZhETF26, 473 (1977)
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Vikhnin, V.S., Zakharchenya, R.I., Asatryan, H.R. et al. Polarons and charge-transfer vibronic excitons in ferroelectric oxides: EPR and photoluminescence studies of Pb x Nb y O z ceramics. Appl. Magn. Reson. 28, 137–145 (2005). https://doi.org/10.1007/BF03167000
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DOI: https://doi.org/10.1007/BF03167000