Texture Development of SrTiO3 Ceramics during Reactive Templated Grain Growth Processing.

Formation of preferentially oriented Y 3 Al 5 O 12 film on a reactive sapphire substrate: Phase and texture transitions from Y 2 O 3

“…where P = I (2kkk)/ I (hkl), P 0 = I 0 (2kkk)/ I 0 (hkl), I is the sum of the peak intensities of the XRD profile of the film, and I 0 is that of randomly oriented reference powder [8,9]. The F value estimated within a 2Â range of 10-80 • was as high as 0.57 for the film heat-treated at 1600 • C on the sapphire (0 0 0 1) substrate, whereas that on (1120) was as low as 0.23.…”

“…The reactive-templated grain growth (RTGG) method has been applied to fabricating highly textured polycrystals such as simple perovskite-type piezoelectric materials and layer-structured materials including bismuth layer-structured ferroelectric and both pand n-type oxidethermoelectrics [8][9][10][11], which is considered to be one of the key technologies for fabricating electronic ceramics with high performances comparable to those of single crystals. In the RTGG method, anisometric single-crystal reactive-template particles are mixed with complementary reactants and aligned, followed by heat-treatment.…”

Texture design for microwave dielectric (Ca0.7Nd0.3)0.87TiO3ceramics through reactive-templated grain growth

“…These textured ceramics with a regular perovskite-type were processed by exploiting topochemical conversion either for the preparation of anisometric regular perovskite-type particles for TGG from isomorphic precursors [8, 9] or for in situ formation of regular perovskite-type grains from aligned anisometric precursor particles with complementary reactants [10]. The latter processing is named as reactive-templated grain growth (RTGG) and Aurivillius-type and Ruddlesden–Popper-type materials are proposed as reactive templates for {100} pc texture [6, 11] whereas limited number of approaches have been known for textured bulk ceramics with other preferred orientations [12]. We need a texture engineering method to ‘tailor’ a ceramic with a particular preferred orientation direction in which the best performance can be extracted from a material.…”

Textured-Ba(Zr,Ti)O3 piezoelectric ceramics fabricated by templated grain growth (TGG)

“…Through the manipulation of both the ceramic consolidation and thermal processes, researchers have produced and measured the properties (dielectric and/or piezoelectric) of range of fiber-textured ceramics, which include: Bi 4 Ti 3 O 12 [14], (Sr,Ba)Nb 2 O 6 [15], (Sr,La) 2 Nb 2 O 7 [16], Sr 2 NaNb 5 O 15 [17], PbNb 2 O 6 [18], (Ba,Bi)TiO 3 [19], SrTiO 3 [20], and solid solutions of NBT [21][22][23][24] and KNN [25,26]. When the fiber-texturing of the grains is in the direction of the polar axis, the piezoelectric and pyroelectric properties were shown to improve drastically due to the increased poling effectiveness.…”