Textured lead titanate ceramics fabricated by slip casting under a high magnetic field

Abstract

Oriented PbTiO 3 ceramics were obtained by slip casting under a high magnetic field, and the orientation factor was 90%. Such highly oriented perovskite ceramics by slip casting under a high magnetic field have never been reported as far as we know. It was thought that dispersibility and crystallinity of the powder were important for orientation by slip casting under a high magnetic field. In this study, we controlled the dispersibility and crystallinity of powder by calcination temperature. As a result, the sample obtained from the powder calcined at 1100°C was oriented, but the one obtained from the powder calcined at 900°C was not. The powder calcined at 900°C is more aggregated than that at 1100°C and the crystallinity of the powder calcined at 1100°C is higher than that of the powder calcined at 900°C. It became clear that highly oriented PbTiO 3 ceramics can be fabricated from the powder with high dispersibility and high crystallinity by slip casting under a high magnetic field.

Fabrication of Textured BaTiO₃ Ceramics by Electrophoretic Deposition in A High Magnetic Field using Single-domain Particles

“…This was probably associated with reduced magnetic anisotropy due to the multi-domain of the BT03 particles. In contrast, textured PbTiO 3 ceramics derived from HM-SC of multi-domain PbTiO 3 particles were reported [13]. A principal distinction between this study and the report is believed to be attributed to the difference in the c/a ratio; that is, BaTiO 3 ~1.008 and PbTiO 3 ~1.06.…”

“…Recently, use of a high magnetic field (HM) of 10-12 T in slip casting (SC) and electrophoretic deposition (EPD) has enabled preparation of textured ceramics derived from spherical particles of materials with anisotropic diamagnetic susceptibilities associated with asymmetric crystal structures, such as TiO 2 and Al 2 O 3 [6][7][8][9][10], in addition to those derived from plate-like particles [11,12]. Furthermore, this approach has extended to spherical particles of piezoelectric PbTiO 3 , and preparation of textured PbTiO 3 ceramics was demonstrated [13]. Thus, it is interesting to apply this approach for preparation of textured BaTiO 3 ceramics.…”

“…For this purpose, the BT particles should be taken cautions to prevent a reduction in the net diamagnetic anisotropy, and this can be achieved through the following [7,13]. First, a large lattice constant ratio c/a is necessary to rotate the BT particles by HM, because the driving force for the particle rotation needs an anisotropy in the magnetic susceptibilities and it correlates with the c/a ratio.…”

Two‐Dimensional Orientation in Bi4Ti3O12 Prepared Using Platelet Particles and a Magnetic Field

“…12 Magnetic orientation has been applied to a wide variety of useful ceramics with feeble magnetic susceptibilities, such as TiO 2 , ZnO, AlN, SiC, zeolite, piezoelectric ceramics, etc. [13][14][15][16][17][18][19][20][21][22] Although some results of the multiaxial orientation were reported, 2,23 control of the orientation is restricted to the fiber texture in most ceramics. To improve the properties, the multidimensional orientation of the microstructure is promising.…”

Processing and enhanced piezoelectric properties of highly oriented compositionally modified Pb(Zr,Ti)O3ceramics fabricated by magnetic alignment

“…(c) The solvent water from the slurry is gradually absorbed into the porous board in a magnetic field. (d) Finally, dried green compacts are obtained.been achieved; we also treated {100} and {200} peaks as the diffractions from oriented grains 41). The {100} and {200} peak intensities of PZT-B were increased by sintering because the non-oriented grains merged into oriented grains 42,43).…”