Effect of BaO-CaO-SiO2 addition on dielectric and electrocaloric properties of lead-free 0.2Ba(Ti0.9Sn0.1)O3-0.8Ba(Zr0.18Ti0.82)O3 bulk ceramics

doi:10.21203/rs.3.rs-607254/v1

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Effect of BaO-CaO-SiO2 addition on dielectric and electrocaloric properties of lead-free 0.2Ba(Ti0.9Sn0.1)O3-0.8Ba(Zr0.18Ti0.82)O3 bulk ceramics

https://doi.org/10.21203/rs.3.rs-607254/v1

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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 ceramics 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(Ti_0.9Sn_0.1)O₃−0.8Ba(Zr_0.18Ti_0.82)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 0.5wt% BCS show the maximum EC response of 3.2K under 7MV/m with sintering temperature of 1262℃. 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.

Ceramics

Applied Mathematics

Electronic Materials and Devices

BZSnT20 bulk ceramics

BaO-CaO-SiO2 sintering aid

Dielectric constant

Loss tangent

Electrocaloric effect(ECE)

Table 1 Comparison of EC properties of the BZSnT20 ferroelectric capacitors developed here with those in the literatures.

Materials	Form	T (℃)	ΔE (MV/m)	ΔS (J·Kg^-1·K^-1)	ΔT (K)	ΔT/ΔE (×10^-6KmV^-1)	ΔS/ΔE (×10^-6JmKg^-1·K^-1·V^-1)	Ref.
BZSnT20 (0.5wt%BaO-CaO-SiO₂)	Bulk ceramic	25	7	4.83	3.2	0.46	0.483	This work
BaZr_0.20Ti_0.8O₃ (1wt%LiBiO₂)	Bilayer thick film	25	10	7.1	3.9	0.39	0.71	[7]
BaZr_0.20Ti_0.8O₃ (1wt%PbO+B₂O₃)	Bilayer thick film	25	10	5.58	3.1	0.31	0.558	[7]
0.8BaZr_0.18Ti_0.82O₃- 0.2BaSn_0.11Ti_0.89O₃ (1wt%PbO+B₂O₃)	Bulk ceramic	25	10	4.8	3.5	0.35	0.48	[25]
BaZr_0.20Ti_0.8O₃ (1wt%PbO+B₂O₃)	thick film	40	9.7	8.5	4.9	0.51	0.88	[31]
0.97(Na_0.5K_0.5)(Na_1-xSb_x)NbO₃-0.03CaZrO₃ (1.0%molCuO)	Bulk ceramic	25	6.5		1.24	0.19		[32]

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Effect of BaO-CaO-SiO2 addition on dielectric and electrocaloric properties of lead-free 0.2Ba(Ti0.9Sn0.1)O3-0.8Ba(Zr0.18Ti0.82)O3 bulk ceramics

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