Tailoring the electrocaloric effect of Pb_0.78Ba_0.2La_0.02ZrO₃ relaxor thin film by GaN substrates

Abstract

The electrocaloric (EC) effect in ferroelectric/antiferroelectric thin films has been widely investigated due to its potential applications in solid state cooling devices.

Positive and negative electrocaloric effect in the direct and indirect characterization of NaNbO3-based ceramics with tetragonal–cubic phase boundary

“…Importantly, a negative DT is obtained when x = 0.15 at 60 1C and x = 0.16 at 30 1C for the indirect method, which is similar to the ECE characteristics of thin films produced by electric field-induced phase transition and substrate modification. [6][7][8] Meanwhile, the P max corresponding to the temperature showed an increasing change tendency with an increase in temperature during the indirect measurement [Fig. 6(f)], implying the influence of the polarization structure on the negative ECE for x = 0.15 and 0.16.…”

“…[1][2][3] The ECE exhibits great potential to become new refrigeration technology because of its better electrocaloric properties and weaker greenhouse effect compared to the traditional vapor-compression refrigeration. [4][5][6][7][8] Thus, ECE materials have become the focus of many researchers, achieving significant breakthroughs in recent years, e.g., a giant DT of 12 K was achieved for PbZr 0.95 Ti 0.05 O 3 antiferroelectric film under a high electric field of 480 kV cm À1 in 2006, 2 which prompted a boom in the research on ECE. Subsequently, the ECE of lead-based materials developed rapidly.…”

B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

“…However, the surface of thin films will become almost free of impurities as the ACBs were added, as shown in SEM images in Figure S1 (j), S1 (l), and S1 (n). Furthermore, the grain size distribution of thin films will become narrower as the ACBs were added (see insets of Figure S1 (b), S1 (d), S1 (f), S1 (h), S1 (j), S1 (l), and S1 (n)), and the columnar-like texture with (111) preferential orientation will also become more obvious, as shown in Figure S1 (a), S1 (c), S1 (e), S1 (g), S1 (i), S1 (k), and S1 (m) [ 17 – 19 ]. Aforementioned results indicate that the ACBs can effectively promote the formation of the perovskite phase and improve the degree of orientation.…”

Dielectric and Energy Storage Properties of Ba(1−x)CaxZryTi(1−y)O3 (BCZT): A Review

“…There are a few lead-based relaxor ceramics which were examined for energy storage applications such as PbZrO 3 -(SrTiO 3 ) [6], Pb(Mn 1/3 Nb 2/3 )O 3 -PbTiO 3 [7,8,9], Eu-doped PbZrO 3 [10], Pb(Ni 1/3 Nb 2/3 )0.5Zr 0.15 Ti 0.35 O 3 (PNNZT) [11], Pb 0.8 Ba 0.2 ZrO 3 [12], La-doped Pb(Zr,Ti)O 3 [13,14,15], Pb[(Ni 1/3 Nb 2/3 )0.6Ti 0.4 O 3 (PNNT) [16], and Pb 0.8 Ba 0.2 ZrO 3 (PBZ) [17,18], Pb 0.99 Nb 0.02 (Zr 0.65 Sn 0.3 Ti 0.05 ) 0.98 O 3 [19], and Pb 0.78 Ba 0.2 La 0.02 ZrO 3 [20]. Among all the lead-based ceramics the most widely used piezoceramic material is Lead zirconate-titanate (Pb(Zr,Ti)O 3 (PZT)) but due to the toxic environmental issues, the European Union introduced a directive for the use of lead-based elements in commercial products and these regulations have attracted researchers to explore lead-free piezoelectrics [21,22,23].…”