Abstract
A study of the dielectric properties of the Lanthanum doped Sr0.3Ba0.7Nb2O6 (SBN30) ceramic according to the stoichiometric formulation Sr0.3–3y/2LayBa0.7Nb2O6 with y = 0.01, 0.03 and 0.05, and the influence of the sintering conditions is reported. The XRD shows single phase compounds for Sr0.285La0.01Ba0.7Nb2O6 (LSBN1) and Sr0.225La0.03Ba0.7Nb2O6 (LSBN3) ceramics, both samples having similar microstructure, densification and dielectric properties. The density increases linearly with ln t, where t is the sintering time, and the values of the maximum ferroelectric peaks of the permittivity increase steadily with t. Using the Bruggeman model to estimate the theoretical permittivity, it is concluded that the magnitude of the experimental permittivity peaks are mainly affected by the volume fraction of porosity of the samples. In this study we also establish that pore diffusion mechanisms behave according to the Ginstling-Brownshtein equation. For the Sr0.225La0.05Ba0.7Nb2O6 (LSBN5) sample, XRD analysis reveals the presence of isostructural compounds of the intermediate phases BaNb2O6 and SrNb2O6, and the dielectric properties start to deteriorate. This fact indicates the existence of a solubility limit of Lanthanum ions in the SBN solid solution.
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References
M.E. Lines and A.M. Glass, Principles and Applications of Ferroelectrics and Related Materials (Claredon Press, Oxford, 1977).
A.M. Glass, J. Appl. Phys., 40, 4699–4713 (1969).
Y. Xu, Ferroelectric Materials and Their Applications (Elsevier Science Publisher B.V., New York, 1991).
A.M. Glass, Appl. Phys. Let., 13, 147–149 (1968).
S.T. Liu and R.B. Maciolek, J. Electr. Mater., 4, 91–100 (1975).
D.J. Mosse, et. al., Proc. IEEE, 59(11), 1628–1629 (1971).
K.K. Deb, Materials for Smart Systems Symposium, Boston, MA, USA, 127–135 (1994).
P. Leiding, M. Villegas, C. Moure, and J.J. Fernández, Proceedings of the Conference on Electronic Ceramics and Applications, Electroceramic V, Ed. Department of Ceramic Engineering, University of Aveiro, Portugal, Book-1, 251–254 (1996).
M. Ohno and K. Takagi, Appl. Phys. Let., 64(13), 1620–1622 (1964).
D.J. Jendritza, P. Stephan, and H. Janocha, Proceeding of the Conference on Electronic Ceramics and Applications, Electroceramic V, Ed. Department of Ceramic Enginnering, University of Aveiro, Portugal, Book-1, 133–136 (1996).
X.H. Wan, J.B. Zou, X.Z. Wang, and X.L. Zhang, Proceeding of the Conference on Electronic Ceramics and Applications, Electroceramic V, Ed. Department of Ceramic Enginnering, University of Aveiro, Portugal, Book-1, 127–130 (1996).
H. Takenchi, S. Jyomura, and C. Nakuya, Jpn. J. Appl. Phys., 24 Supplement 24–2, 36–40 (1985).
F. Guerrero, J.J. Portelles, I. González, A. Fundora, H. Amorín, J. Siqueiros, and R. Machorro, Solid State Communication, 101(6), 463–466 (1997).
H. Amorín, F. Guerrero, J. Portelles, I. González, A. Fundora, J. Siqueiros, and J. Valenzuela, Solid State Communication, in press (1998).
R.W. Moulson, Fundamentals of the Physics Ceramic (Ed Pergamon Press, New York, 1990).
S.H. Nishiwaki, J. Takahashi, and K. Kodeira, Jpn. J. Appl. Phys., 33, 5477–5481 (1994).
K. Nagata, Y. Yamamoto, H. Igarashi, and K. Okazaki, Ferroelectrics, 38, 853–856 (1981).
T. Tsang, W. Nantiu, and F. Fuhshan, J. Mater. Sci. Lett., 13, 1746–1748 (1994).
R.B. Atkin and R.M. Fulrath, J. Am. Ceram. Soc., 54(5), 265–270 (1971).
Q.Y. Jiang and L.E. Cross, J. Mat. Sci., 28, 4536–4543 (1993).
PC-APD Windows Software for Automated Powder Diffraction, User's Guide, Second Edition, 1994 Copyright© Philips Electronics N.V. 1993.
R.B. Maciolek and S.T. Liu, J. Electr. Mater., 4, 517 (1975).
R.L. Coble, J. Appl. Phys., 32(5), 787–792 (1961).
F. Abad El Salam, A. Tawfik, and A.I. Eatah, Ferroelectrics, 65, 131–141 (1985).
Y. Sato, H. Kanai, and Y. Yamashita, Jpn. J. Appl. Phys., 33, 1380–1384 (1994).
W. Wersing, K. Lubit, and J. Mohaupt, Ferroelectrics, 68, 77 (1986).
F. Amar, J. Bernhoic, B. Sthephan, J. Jellinek, and P.J. Salamon, J. Appl. Phys., 65(8), 3219–3225 (1989).
R.C. MacKenzie, Differential Thermal Analysis (Academic Press, London, 1972).
I.T. Tareev, Física de los Materiales Dieléctricos (Ed Mir, Moscú, 1975).
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Guerrero, F., Amori´n, H., Portelles, J.J. et al. Dielectric Properties of La3+ Doped Sr0.3–3y/2Lay Ba0.7Nb2O6 Ceramics Prepared under Different Sintering Conditions*. Journal of Electroceramics 3, 377–385 (1999). https://doi.org/10.1023/A:1009970031479
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DOI: https://doi.org/10.1023/A:1009970031479