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Showing papers on "Lead zirconate titanate published in 1976"


Journal ArticleDOI
TL;DR: In this paper, the results of a collaborative study of the ferroelectric-ferroelectric transition in rhombohedral lead zirconate-titanate are described.
Abstract: The results of a collaborative study of the ferroelectric-ferroelectric transition in rhombohedral lead zirconate-titanate are described. Firstly, experimental evidence for the first-order nature of the transition is given together with an explanation of this in pure single crystals. Secondly, the use of bismuth-doped ceramic material in pyro-electric detection is discussed. By applying an electric field on the cooling cycle, thermal hysteresis can be reduced to a minimum.

54 citations


Journal ArticleDOI
TL;DR: In this article, the rhombohedral-rhombohedral transition in PbZrxTi1-xO3 was found to be of first order in the case of the oxygen octahedra.
Abstract: The rhombohedral-rhombohedral transition in PbZrxTi1-xO3 is found to be of first order. Calculations are given of the tilt angle of the oxygen octahedra about [111] together with the octahedron strain. Coupling between these two quantities is found to account for the nature of the phase transition. In addition, an explanation of the pyroelectric behaviour is given.

38 citations


Journal ArticleDOI
TL;DR: In this article, the ferroelectric-paraelectric phase transition in PbZrxTi1-xO3 (0.88 < x < 1) has been investigated using x-ray, dielectric and optical techniques.
Abstract: The ferroelectric-paraelectric phase transition in PbZrxTi1-xO3 (0.88 < x < 1) has been investigated using x-ray, dielectric and optical techniques. It is shown that a changeover from first-order to second-order behaviour occurs at around x = 0.94. The exponent, β, of the order parameter in the region of this critical point is about 0.22 which is comparable with that predicted by mean-field theory.

22 citations



Journal ArticleDOI
TL;DR: In this paper, the effects of new substitutional ions on achieving optically transparent hot-pressed lead zirconate titanate ceramics were examined, and the experimental results were negative.
Abstract: This paper reports the effects of new substitutional ions on achieving optically transparent hot-pressed lead zirconate titanate ceramics. The effects of both single ion substitution and simultaneous substitution of different ions at A and B sites were examined. In single ion substitution, the experimental results were negative. It was found that simultaneous substitution of two kinds of ions was very effective in producing transparent hot-pressed PZT ceramics. New transparent ferroelectric ceramics suitable for electro-optic applications have been prepared by simultaneous substitution of mono- and penta-valent ions or two trivalent ions, such as Na1+ and Nb5+, K1+ and Ta5+, and Sm3+ and In3 +. SUMMARY

5 citations


01 Apr 1976
TL;DR: In this paper, the effects of temperature, impurities, definect structure, nonstoichiornetry, and microstructure on the electrical conductivity of polycrystalline lead zirconate-titanate and lithium ferrite ceramics were investigated.
Abstract: Electrical conduction in polycrystalline lead zirconate-titanate and lithium ferrite ceramics was investigated. The effects of temperature, impurities, def~ct structure, nonstoichiornetry, and microstructure on the electrical conductivity were determined and compared witlt the existing theoretical models. Polycrystalline compacts of lead zirconate-titanate and lithium ferrite were fabricated with various dopants and stoichiometry. A packing powder technique in 1 atm oxygen was used to control the stoichiometry of the samples. The de resistivity was measured by using a guard-ring method. Thermoelectric power measurements were also conducted to characterize the type of charge carriers contributing to the conduction process. It is shown that electrical conduction in lead zirconate-titanate follows typical semiconductor behavior. Holes contributed by lead vacancies are the major charge carriers. Impurity ions \vbich serve as acceptors or donors significantly affect the conduction process • The activation energy is 3.6 eV for intrinsic conduction, 1.41 eV for extrinsic conduction due to Nb 2 o 5 doping, and 1.01 eV due to Sc 2 o 3 doping. Data are presented to show the influence of stoichiometry which affects the concentration of charge carrier, and temperature which

5 citations