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Ultrahigh room temperature electrocaloric response in lead-free bulk ceramics via tape casting

Du, Hongliang and Chang, Yunfei and Li, Chunwang and Hu, Qingyuan and Pang, Jing and Sun, Yuan and Weyland, Florian and Novak, Nikola and Jin, Li (2019):
Ultrahigh room temperature electrocaloric response in lead-free bulk ceramics via tape casting.
In: Journal of Materials Chemistry C, RSC Publishing, pp. 6860-6866, 7, (23), ISSN 2050-7526,
DOI: 10.1039/c9tc01407a,
[Article]

Abstract

Solid-state cooling technology based on the electrocaloric effect is attracting increasing attention as an important alternative to traditional cooling systems in microelectronic and integrated electronics. Leadfree bulk ceramics are considered as one of the promising candidates for middle and large-scale electrocaloric cooling because of their environment-friendliness and large heat absorption capacity. However, the room temperature adiabatic temperature change (DT) in lead-free bulk ceramics has long been limited by their relatively low dielectric breakdown strength (Eb o 60 kV cm�1), hindering their practical applications. In this work, we propose to use the tape casting technique as a practicable strategy to enhance the densification and decrease the porosity of lead-free bulk ceramics for achieving a high Eb and a large room temperature DT. An ultrahigh room temperature DT (1.6 K) was realized in a (Ba0.95Ca0.05)(Ti0.94Sn0.06)O3 (BCTS) bulk ceramic prepared by the tape casting technique, which is 4 times larger than that of the lead-free bulk ceramics with a similar composition prepared by the conventional ceramic preparing approach. More significantly, unlike the other previously reported results, which only show high DT in an extremely narrow temperature range, DT of the BCTS bulk ceramic increases from 1.6 K to 2.0 K in the temperature range from 300 K to 345 K, which is comparable with that found in the lead-based bulk counterpart. Most importantly, this work opens up a new avenue to explore lead-free bulk ceramics with a large room temperature DT for solid-state refrigeration.

Item Type: Article
Erschienen: 2019
Creators: Du, Hongliang and Chang, Yunfei and Li, Chunwang and Hu, Qingyuan and Pang, Jing and Sun, Yuan and Weyland, Florian and Novak, Nikola and Jin, Li
Title: Ultrahigh room temperature electrocaloric response in lead-free bulk ceramics via tape casting
Language: English
Abstract:

Solid-state cooling technology based on the electrocaloric effect is attracting increasing attention as an important alternative to traditional cooling systems in microelectronic and integrated electronics. Leadfree bulk ceramics are considered as one of the promising candidates for middle and large-scale electrocaloric cooling because of their environment-friendliness and large heat absorption capacity. However, the room temperature adiabatic temperature change (DT) in lead-free bulk ceramics has long been limited by their relatively low dielectric breakdown strength (Eb o 60 kV cm�1), hindering their practical applications. In this work, we propose to use the tape casting technique as a practicable strategy to enhance the densification and decrease the porosity of lead-free bulk ceramics for achieving a high Eb and a large room temperature DT. An ultrahigh room temperature DT (1.6 K) was realized in a (Ba0.95Ca0.05)(Ti0.94Sn0.06)O3 (BCTS) bulk ceramic prepared by the tape casting technique, which is 4 times larger than that of the lead-free bulk ceramics with a similar composition prepared by the conventional ceramic preparing approach. More significantly, unlike the other previously reported results, which only show high DT in an extremely narrow temperature range, DT of the BCTS bulk ceramic increases from 1.6 K to 2.0 K in the temperature range from 300 K to 345 K, which is comparable with that found in the lead-based bulk counterpart. Most importantly, this work opens up a new avenue to explore lead-free bulk ceramics with a large room temperature DT for solid-state refrigeration.

Journal or Publication Title: Journal of Materials Chemistry C
Volume: 7
Number: 23
Publisher: RSC Publishing
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 14 Jun 2019 09:35
DOI: 10.1039/c9tc01407a
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