Showing papers on "Lead zirconate titanate published in 1973"
TL;DR: In this paper, Lanthanum-doped lead zirconate titanate (PLZT) ceramics have been studied by electrical, optical and thermal means, and the results obtained have been used to elucidate the nature and extent of the phases occurring and the phase transitions between them.
Abstract: Lanthanum-doped lead zirconate titanate (PLZT) ceramics of composition 8/65/35 and 9/65/35 have been studied by electrical, optical and thermal means. The results obtained have been used to elucidate the nature and extent of the phases occurring and the phase transitions between them. Phase α is obtained by thermally depoling a ceramic. It is converted into phase β by the application of electric fields or stress. On removal of the electric field, phase β is retained below a temperature TD while it reverts back to phase α if the temperature is above Tt. If phase β is heated, it transforms into α at Tt, but there is no reverse transformation on cooling. The transition at Tt can be sharp for chemically homogeneous material. Phase α is found to be non-birefringent, even in a single grain. It has linear dielectric and elastic properties. Phase β is birefringent, ferroelectric and ferroelastic. The properties of the two phases and the transitions between them can be used to explain the effects of electric field...
96 citations
01 Jun 1973
TL;DR: In this paper, it was shown that the Kerr quadratic electro-optic effect occurs in slim-loop ferroelectric lead zirconate titanate (PLZT) compositions for electric fields in the range 0 s lE 1
Abstract: Ferroelectric ceramic material lanthanum-modified lead zirconate titanate (PLZT) has the unusual property that thin plates of fine grained material are transparent. PLZT offers a variety of properties of interest, including electrically controlled birefringence (Ref. 1) and electrically controlled scattering of light (Ref. 2), and ferroelectric, pyroelectric and piezoelectric properties. The first two properties are of particular interest as the basis for constructing light switches, insulators, displays, and optical memories. Parameters entering into the material preparation process, such as impurities, modifiers, dopants, conditions of hot pressing, and the grain size of the ceramic influence the device performance characteristics (Ref. 3). Materials in the PLZT family can exhibit an electro-optic memory effect (related to variations of ceramic birefringence with remanent polarization), a quadratic (Kerr) electro-optic effect, or a linear (Pockels) electro-optic effect depending on the lanthanum content and the Zr/Ti ratio. Land (Ref. 4) indicates that electro-optic memory effects are found in low coercivity rhombohedral and tetragonal PLZT compositions. The Kerr quad-ratic electro-optic effect occurs in slim-loop ferroelectric PLZT compositions for electric fields in the range 0 s lE 1
3 citations