Details

Autor(en) / Beteiligte

• Bai, Yang
• Han, Xi
• Qiao, Li-Jie

Titel

Effect of donor doping in B sites on the electrocaloric effect of BaTi 1−x Nb x O 3 ceramics

Ist Teil von

• RSC advances, 2015, Vol.5 (88), p.71873-71877

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This paper demonstrates the effect of donor doping in B sites on the electrocaloric effect (ECE) in BaTi 1−x Nb x O 3 ( x = 0–0.01) ferroelectric ceramics. The Nb substitution for Ti does not affect the formation of the perovskite structure, while it obviously inhibits the grain growth in sintering process. The donor doping of Nb controls the ferroelectric phase transition more efficiently than equivalent substitutions in either the A or B sites. It lowers the phase transition temperature about one order of magnitude faster than an equivalent substitution, so the ECE Δ T max shifts accordingly. Nb doping also diffuses the phase transition, so that the ECE Δ T max reduces and the peak becomes much wider. When compared with BaTiO 3 , the Δ T max of BaTi 0.994 Nb 0.006 O 3 drops one third, while the full width at half maximum increases two fold, indicating a better refrigeration capacity.