Effects of yttrium substitution and oxygen deficiency on the crystal phase, microstructure, and thermoelectric properties of Sr1−1.5xYxTiO3−δ (0⩽x⩽0.15)

Enhancing the thermoelectric power factor of Sr0.9Nd0.1TiO3 through control of the nanostructure and microstructure

“…tends to result in lower thermal conductivity because of the increase in mass and strain contrast. 13,15,18,21 For example Liu et al 14 showed that Nd doping at 10 at.% simultaneously improved the ZT value of SrTiO3 by enhancement of power factor and reduction of thermal conductivity. Subsequently Kovalevsky et al 13 and Liu et al 14…”

Ultralow dielectric loss in Y‐doped SrTiO3 colossal permittivity ceramics via designing defect chemistry

“…Oxygen vacancies are inevitable in oxides, 18,32,38 which is no exception in SYT ceramics. Because of using of the nonstoichiometry batching method (A‐site deficient compositions, Sr 1‐1.5 x Y x TiO 3 ), there are in SYT ceramics 39,40 . The SYT ceramics sintered in N 2 show larger lattice parameters in the inset of Figure 2B, which can be attributed to the transformations of Ti 4+ cations (60.5 PM) into Ti 3+ (67 pm) caused by the typical charge compensation mechanism 47 .…”

“…Because of using of the nonstoichiometry batching method (A-site deficient compositions, Sr 1-1.5x Y x TiO 3 ), there are V ,, in SYT ceramics. 39,40 The SYT ceramics sintered in N 2 show larger lattice parameters in the inset of Figure 2B, which can be attributed to the transformations of Ti 4+ cations (60.5 PM) into Ti 3+ (67 pm) caused by the typical charge compensation mechanism. 47 The common charge compensation mechanism in ST-based ceramics sintered in reducing atmosphere is that Ti 4+ transform to Ti 3+ partially, 30,31,34,35 so Ti 3+ exist in SYT ceramics.…”

“…The dielectric loss of SYT ceramics is high (>0.1), which needs further improvement and research 36 . At present, the study of Y doping into ST mainly focuses on the electrical conductivity and thermoelectric properties, but few researches have been carried out on the origin of CP of these materials 37‐39 . Meanwhile, we can see that there are many mechanisms of giant dielectric properties for ST‐based ceramics and other ceramics, and most of them are controversial needing further investigation.…”

“…Rare earth element Y was doped with trace amount (<1.5mol %, preventing interference caused by second phase generation) to ST, and sintered in different atmosphere in this study. The ultralow tanδ and CP material were obtained, as shown in Figure 1 2‐4 , 11‐13 , 15 , 17‐19 , 22‐24 , 30 , 31 , 36‐46 while the defect states and influence mechanism of ultralow tanδ and CP response in SYT ceramics were studied.…”