The process of densification and shrinkage during the final stage of liquid-phase sintering is described. The densification occurs by the liquid filling of pores during grain growth. The pore filling results in an instantaneous drop of liquid pressure in the compact and causes gradual accommodation of grain shape. The grain shape accommodation by the growth causes the specimen shrinkage. At the same time, the grains tend to restore their spherical shape, resulting in microstructure homogenization around filled pores. The process of densification and shrinkage appears to be determined by the growth of grains during sintering.[

Two sets of (Mg,Y)-doped BaTiO 3 samples were prepared to investigate the effects of the core/shell volumetric ratio on the dielectric-temperature behavior of BaTiO 3 : one set with samples of the same grain size but different core sizes and the other with samples of the same core size but different shell thicknesses. The microstructural variation of the samples was characterized and their dielectric properties were measured. For both sets of samples, the temperature stability of the dielectric properties was generally improved with a reduction of the volumetric shell ratio regardless of the grain and core sizes. There existed, however, a limit of the reduction; for the studied range, shell thickness of one third of the core radius appeared to be an optimum thickness for the given amounts of dopants. It was concluded that the volumetric shell ratio should be optimized so as not to exceed a specific limit, for our case two thirds of the grain volume, to secure temperature stability of the dielectric properties of BaTiO 3 .

No abstract

This study explored the relationship between people's inferiority complex and SNS addiction proneness, and examined the mediating models of self-presentational motives moderated by perceived differences in self-worth between reality and online game community (DSRGC). Participants in the study were 293 male and female adults aged 19 or older who were selected by convenience sampling through the online survey. PROCESS Macro 3.5 Model 4 and 7 was used for analyses of mediating effect and moderated mediating effect. Results revealed that inferiority complex was positively correlated with, self-presentational motives, DSRGC, and SNS addiction proneness, while selfpresentational motives and DSRGC were positive correlated with SNS addiction proneness. In a moderated mediating model for SNS addiction proneness, there was significant interaction effect of inferiority complex and DSRGC on self-presentational motives, and conditionally indirect effect of inferiority via self-presentational motives was only significant in groups with low DSRGC. These findings suggest that only when people have low DSRGC, the mediating effect of self-presentational motives is significant in relation of inferiority complex and SNS addiction proneness. In particular, DSRGC moderates the influence of inferiority complex on self-presentational motives.