Abstract
In recent years, compared with traditional refrigeration technology, the electrocaloric refrigeration technology has been applied in variety of green cooling devices due to its high efficiency and environmentally friendly. Recent findings reveal that the ceramic system with additives (such as, LiBiO2, PbO) can create large ECE under low electric field. In this work, the ternary glass BaO–CaO–SiO2 (BCS) was used as a sintering aid to enhance the electrocaloric (EC) response of 0.2Ba(Ti0.9Sn0.1)O3-0.8Ba(Zr0.18Ti0.82)O3(BZSnT20) bulk ceramics. The EC properties of BZSnT20 could be also improved via controlling sintering temperature and the content of BCS sintering aid. It was found that BZSnT20 with 0.5 wt% BCS show the maximum EC response of 3.2 K under 7 MV/m with sintering temperature of 1262 °C. These results demonstrated that the ECE of BZSnT20 can be boosted by using appropriate additives, which provides an effective route to realize large ECE under low electric fields.
Highlights
New solid refrigeration technology has attracted growing attention in recent years
It can be seen from figure 1 that the surface of all BZSnT20 are relatively smooth with few plaques
As a result that the addition of BCS sintering aid determine the color of BZSnT20 bulk ceramics
Summary
New solid refrigeration technology has attracted growing attention in recent years. Much progress has been made on electrocaloric refrigeration [1], magnetic card refrigeration [2], thermoelectric refrigeration [3] and semiconductor refrigeration [4] etc. The mechanism of electrocaloric refrigeration technology determines that it is a high efficiency and environmentally friendly technology It has a broad prospect of application. To fulfill the demand of low-temperature co-firing of the dielectric layer and the metal electrode, the sintering temperature of the electrocaloric material should be lowered [7]. BZT20 system is one of the most abundant EC materials in the electrocaloric refrigeration technology area, BCS has not been widely used as sintering aid in BZT20 system to achieve high ECE. This work indicated that environmentally friendly electrocaloric refrigeration devices can be achieved via controlling sintering temperature and the content of BCS sintering aid in BZSnT20 system, and large ECE under low electric fields at room temperature can be realized
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