A critical evaluation of reactive templated grain growth (RTGG) mechanisms in highly [001] textured Sr_0.61Ba_0.39Nb₂O₆ ferroelectric-thermoelectrics

Abstract

Abstract

Progress on the fabrication of lead-free textured piezoelectric ceramics: perspectives over 25 years

“…Among many reasons for this, the reinforcement of texture degree is one of the most critical. As observed in Table 3 [91,103,104]. When the same template is used, a large property improvements for the piezoelectric ceramics can be attributed to the promotion of texture fraction and relative density such as textured Ba(Zr 0.2 Ti 0.8 )O 3 -(Ba 0.7 Ca 0.3 )TiO 3 ceramics using platelike BaTiO 3 as template [100,101].…”

“…Some examples are Sr x Ba 1-x Nb 2 O 6 , NaSr 2 Nb 5 O 15 , KSr 2 Nb 5 O 15 , etc. The development of textured Sr x Ba 1-x Nb 2 O 6 and NaSr 2 Nb 5 O 15 ceramics is limited due to shortcoming in the fabrication of same composition template particles through they have been prepared by the (R)TGG using needlelike KSr 2 Nb 5 O 15 particles as templates [90,91,103]. Recently, the needlelike NaSr 2 Nb 5 O 15 particles were synthesized by our group [59,60], which will be used as template to promote the development of textured NaSr 2 Nb 5 O 15 ceramics.…”

Low-field dynamic magnetic alignment and templated grain growth of diamagnetic PMN–PT ceramics

“…This trend follows closely with the predictions of Yamaguchi et al 24 The estimated values of x r obtained for slips with 25 and 30 vol% solid loading are ;2 and 7, respectively, and are low enough that m 3 may be noticeably reduced below m SAT 3 . In contrast, the 35 vol% slip shows x r % 23, and thus, the order parameter for this sample (m 3 The results in Fig. 8 were also checked by calculating the time required for MA at each viscosity.…”

“…For this calculation, templates were modeled as discs of 8-lm diameter. The order parameter m SAT 3 and FWHM values are plotted as a function of estimated x r in Fig. 8.…”

“…[1][2][3][4] In almost all cases, templates are aligned mechanically using shear forces (tape casting) or compression (uniaxial pressing). 1 Texture qualities in these ceramics can be well represented by the texture fraction f and the orientation parameter r in the March-Dollase (MD) equation 5 :…”