Large energy storage density in BiFeO3-BaTiO3-AgNbO3 lead-free relaxor ceramics

Realizing High Comprehensive Energy Storage and Ultrahigh Hardness in Lead-Free Ceramics

“…Figure a illustrates a comparison of W rec and η among the KNN-0.025LB ceramics and other lead-free ceramics, including KNN-based, BNT-based, BT-based, AN-based, and BF-based ceramics. ,,,− The energy storage properties of KNN-0.025LB ceramics have good W rec and η values at the same time. Figure b gives the DBS, W , and W rec values of KNN- x LB ceramics with varying x .…”

“…Among these systems, BF-, BNT-, and BT-based ceramics usually possess a high-efficiency η but a low W rec value [see high-efficiency η value of 84% with a W rec of 2.11 J/cm 3 can be obtained for 0.56BF−0.3BT−0.14AN ceramics. 14 Similarly, a W rec of 2.11 J/cm 3 was obtained in 0.61BF−0.33BT− 0.06La(Mg 0.5 Ti 0.5 )O 3 ceramics, with η reaching up to 82% at 130 kV/cm 13 . Moreover, in Sr-doped BNT-based ceramics, 29 the recoverable energy density (1.70 J/cm 3 ) with a high η (87.2%) was achieved under an electric field of 130 kV/cm.…”

“…However, the toxic nature of lead, which is harmful to the environment and human beings, increases the urgency of developing lead-free substitutions. Nowadays, ecofriendly dielectric ceramics, such as BiFeO 3 (BF), − BaTiO 3 (BT), ,− (Bi 0.5 Na 0.5 )­TiO 3 (BNT), − AgNbO 3 (AN), − and (K 0.5 Na 0.5 )­NbO 3 (KNN), ,,,− have been developed to a research hotspot.…”

“…Among these systems, BF-, BNT-, and BT-based ceramics usually possess a high-efficiency η but a low W rec value [see Figure a]. For example, at an electric field of 195 kV/cm, a high-efficiency η value of 84% with a W rec of 2.11 J/cm 3 can be obtained for 0.56BF–0.3BT–0.14AN ceramics . Similarly, a W rec of 2.11 J/cm 3 was obtained in 0.61BF–0.33BT–0.06La­(Mg 0.5 Ti 0.5 )­O 3 ceramics, with η reaching up to 82% at 130 kV/cm 13 .…”

Lead-Free BiFeO3–BaTiO3 Ceramics: An Overview

“…The improvement in ferroelectricity of BFO-BTO ceramic system is done through substitution of different ions, for example Co 3+ , Cu 2+ , Mn 2+ , La 2+ , Nd 3+ , Dy 3+ , Er 3+ , Eu 3+ , Cr 3+ , Ni 2+ , Al 3+ , Ce 2+ , Gd 3+ , and Ga 3+ [44][45][46][47][48][49][50][51][52][53]. The electrical properties are also improved in multiphase solution like BiMeO 3 (Me = Al, Ga, Y, Sc, Zn 1/2 Ti 1/2 , Mg 2/3 Nb 1/3 , Zn 2/3 Nb 1/3 ), La 0.7 Sr 0.3 MnO, Na 0.5 Bi 0.5 TiO 3 [32,[54][55][56][57][58].…”