Effect ofBa2+substitution on the stability of the antiferroelectric and ferroelectric phases in(Pb

Abstract

The relative stability of the ferroelectric rhombohedral (F R ) and antiferroelectric orthorhombic (A O ) phases of (Pb 1Ϫx Ba x )ZrO 3 has been investigated as a function of Ba 2ϩ concentration ͑x͒ using phenomenological theory considerations. It is shown that all the unknown parameters in the free-energy expressions for the F R and A O phases can be evaluated using the dielectric and x-ray-diffraction data as a function of temperature. We show that the differences in the energies of antiferroelectric and ferroelectric phases decrease with increasing Ba 2ϩ concentration, indicating the gradual destabilization of the antiferroelectric phase. The theoretically predicted critical composition xϭ0.17Ϯ0.0025, above which no antiferroelectric phase can exist, is found to be in excellent agreement with the experimental observations.

Effect of BiAlO3 modification on the stability of antiferroelectric phase in PbZrO3 ceramics prepared by conventional solid state reaction

“…[8,10] or (Pb,Ba)ZrO 3 [5,7]. Nevertheless, at high temperature, the dielectric data revealed an enhanced dielectric loss with increasing BAO concentration.…”

“…Therefore, most AFE ceramics are modified chemically by adding metal oxide at the A-and B-sites of the perovskite structure. The FE intermediate phase can be induced by adding Ba 2+ , Sr 2+ , and La 3+ at the Pb 2+ -site [2,[4][5][6][7]. Moreover, our recent research found that the FE intermediate phase also can be induced by adding, for example, hybrid-doped Ni 2+ /Nb 5+ , Zn 2+ /Nb 5+ , Co 2+ /Nb 5+ and Mg 2+ /W 6+ at the Zr 4+ -site [8][9][10][11][12][13][14].…”

The phase evolution with temperature in 0.94PbZrO3–0.06Pb(Mg1/2W1/2)O3 antiferroelectric ceramic

“…Shirane [16] investigated the phase transition behavior of Ba 2+ doping in PZ and reported that the ferroelectric intermediate phase between the AFE and PE phase for Ba 2+ concentrations was lower than x = 0.175. Pokharel and Pandey [17,18] reported that relaxor ferroelectric behavior for Ba 2+ concentrations was higher than x = 0.25. Recently, it was reported that antiferroelectric (Pb 1−x Ba x )ZrO 3 (PBZ) films, with a higher barium content of more than 45 mol%, were in paraelectric state at room temperature and possessed excellent dielectric properties comparable to (Ba,Sr)TiO 3 [6].…”

Dielectric properties and phase transition behaviors in (1−x)PbZrO3–xPb(Mg1/2W1/2)O3 ceramics

“…However, transition from the orthorhombic AFE to a rhombohedral FE structure, at a few degrees below the PE transition temperature, has been reported by several authors. 5, 6 It is well known that the AFE to FE phase transformation in PZ ceramic requires a very strong electric field; otherwise, dielectric breakdown occurs. 3 Consequently, most commercial AFE ceramics are chemically modified by adding Ti 4+ , Nb 5+ , Sn 4+ , or La 3+ to reduce the critical field and optimize the physical and electrical properties.…”