Investigation on antiferroelectricity of Pb_0.97La_0.02(Hf_1−xTi_x)O₃ceramics with low Ti content (0 ≤ x ≤ 0.1)

Abstract

PbHfO 3 was found with antiferroelectricity early and identical to PbZrO 3 in many aspects but much less attention was received. In the present work, the PbHfO 3 -based ceramics with compositions of Pb 0.97 La 0.02 (Hf 1−x Ti x )O 3 (PLHT, 0 ≤ x ≤ 0.1) were fabricated, and their antiferroelectricity was investigated. All the compositions have an initially antiferroelectric (AFE) phase and by introducing Ti content, the AFE phase is destabilized. Typical AFE-like double polarizationelectric field (P-E) loop was observed in compositions with 0 ≤ x ≤ 0.08. When x = 0.10, the composition is initially AFE but remains ferroelectric (FE) phase after the removal of the external electric field, resulting in an FE-like single P-E loop. The temperature dependence of phase transition and multiple phase transition behavior in PLHT was also studied. This work revealed the antiferroelectricity in PLHT with low Ti content. In addition, the potential application of PLHT for energy storage and conversion was also discussed. A recoverable energy density of 7.1 J/cm 3 and efficiency of 78.5% were achieved in Pb 0.97 La 0.02 HfO 3 at 300 kV/cm.

Improving energy storage properties of PbHfO3-based antiferroelectric ceramics with lower phase transition fields

“…Upon comparison (as illustrated in Fig. 6d), 7,15,18,19,25–27,32,33,35,39–43,45,50,54–56 it becomes evident that the PLHST ceramic with x = 0.6 surpasses other AFE materials in terms of the W rec / E AFE–FE value. This serves as a clear demonstration of the potential application of the PLHST ceramic with x = 0.6.…”

“…The appearance of ( 200) and ( 002) indicates that all ceramics exhibit an orthorhombic phase structure. 39,41 Moreover, the diffraction peaks shift towards lower angles as the Hf 4+ content increases, which can be explained by the fact that the ionic radius of Hf 4+ (0.71 Å) is larger than that of Sn 4+ (0.69 Å), resulting in an expansion of the unit cell volume. 46 Fig.…”

“…6c depicts a comparison of the AFE-FE phase transition electric field and energy storage density among various AFE materials. 7,15,18,19,[25][26][27]32,33,35,[39][40][41][42][43]45,50,[54][55][56] Typically, in AFE materials, a high AFE-FE phase transition electric field is necessary to obtain a substantial W rec . Nonetheless, the PLHST ceramic with x = 0.6 stands out by achieving a relatively high W rec (6.9 J cm −3 ) even at a lower AFE-FE phase transition electric field (15.4 kV mm −1 ).…”

“…40 Xu et al prepared La-doped PH-based AFE ceramics, obtaining a W rec of 7.1 J cm −3 and an η of 78.5% in Pb 0.97 La 0.02 HfO 3 under an AFE–FE phase transition electric field of about 26.5 kV mm −1 . 41 At present, the number of studies on the energy storage performance of PH-based AFE materials is limited. From the above examples, it can be observed that the energy storage performance is predominantly enhanced by increasing the AFE–FE phase transition electric field of PH-based AFE materials, which also increases the inherent risk of high voltage and the cost of insulation technology.…”

Synergistic design of a new PbHfO3-based antiferroelectric solid solution with high energy storage and large strain performances under low electric fields

“…10,12 Although PHf is expected to possess excellent properties, its practical applications are considerably limited by its high E cr value compared to its E b at RT. 7,13 Various strategies have been proposed to address this issue, such as doping/substituting A/B ions, [14][15][16][17][18] forming solid solutions with Pb(Mg 1/2 W 1/2 )O 3 (PMW), 7 and using various techniques to prepare thin/thick lms. [19][20][21][22] However, the reported E b value in PHf-based ceramics and thin/ thick lms is still quite high, 13,21 which poses a challenge to device operation safely.…”