Effect of synthesis method on the long-range order of the space charge type in 0.75PFW–0.25PT ceramics

Investigating the physical meanings of diffused phase transition models

“…Similarly, comparing Curve 4 with Curve 1 and Curve 2, we find that the effect of the value related to the dielectric constant variance is similar to the result obtained for the value. Thus, larger and values cause the lower dielectric constant variance which can describe the dielectric diffused characteristic and coincides with the experimental results [9][10][11][12][13][14][15][16][17][18][19].…”

“…1, the T c distribution curve becomes less steep and the diffused characteristics are more obvious when the value is smaller. Based on the experimental results, several researchers have found that both the and values potentially increase when the relaxor materials tend to exhibit more complete DPT behaviour [9][10][11][12][13][14][15][16][17][18][19]. These experimental results are contrary to our previous discussion of Eq.…”

“…Although the changes of does not generally affect T c distribution so much, a larger value still represents a more diffused phase transition in the half-height half-width area. Based on other reports, more complete DPT relaxors show larger and values, and the value of is close to 2 for total DPT material [9][10][11][12][13][14][15][16][17][18][19]. These experimental results are not contrary to our previous discussion of Eq.…”

“…The diffused phase transition (DPT) model is popularly used to describe the dielectric behaviour of relaxor ferroelectric (RFE) materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Smolensky hypothesized that different transition temperatures exist in different micro regions due to compositional fluctuation.…”

“…As mentioned before, researchers have frequently used both Eqs. (3) and (4) to discuss the dielectric diffused characteristics of RFE materials [9][10][11][12][13][14][15][16][17][18][19]. However, the fitting adaptability between Eqs.…”