Effect of Sr0.7M0.2TiO3(M=Bi, Sm, La, Gd) Doping on Properties of (Bi0.5Na0.5)0.94Ba0.06TiO3 Ceramic Energy-Storage Materials

doi:10.16553/j.cnki.issn1000-985x.xb2026.0015

Abstract

Abstract: In this paper，ceramic energy-storage materials of 0.95（Bi_0.5Na_0.5）_0.94Ba_0.06TiO₃-0.05Sr_0.7M_0.2TiO₃ （M=Bi，Sm，La，Gd，BNBT-SMT） were prepared by the solid-state sintering method，and their crystal structure，dielectric temperature spectra，ferroelectric properties，and energy-storage properties were investigated. XRD results show that all ceramic samples exhibit a single perovskite structure after sintering at 1 125 ℃. The dielectric temperature spectra indicate that all ceramic samples display typical characteristics of relaxor ferroelectrics. With Sr_0.7M_0.2TiO₃doping，shape of the hysteresis loop curves of samples exhibit an obvious evolution trend，and its shape gradually changes from the “wide fat type” characteristic with wider and larger saturation polarization value to the “slender type” with narrower，smaller remanent polarization intensity and relatively lower coercive field strength. Meanwhile，the maximum polarization intensity （P_max） is significantly enhanced，thereby improving the energy-storage properties of the materials. When M=Bi and the applied electric field is 4 kV/mm，the recoverable energy-storage density reaches the optimal value of W_rec=0.29 J·cm^-3，and the corresponding energy-storage efficiency of η= 51.4%.

Key words: solid-state sintering; perovskite; sodium bismuth titanate; BNBT-SMT; hysteresis loop; energy-storage property

CLC Number:

TQ174

LIU Zhaolin, SHAO Hui, LI Jianping. Effect of Sr_0.7M_0.2TiO₃(M=Bi, Sm, La, Gd) Doping on Properties of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ Ceramic Energy-Storage Materials[J]. Journal of Synthetic Crystals, 2026, 55(6): 956-965.

Figures/Tables 8

Table 1 Comparison of energy-storage properties of different modified BNBT-based ceramics

Chemical formula	W_rec/（J·cm^-3）	η/%
BNBT-100xBZT	1.46	81.90
BNT-6BT-xST	5.48	87.00
BNBT-SNN-xNN	1.52	82.00
0.6BNT-0.21BT-0.19BiScO₃	4.22	86.83
BNBT-0.25Sr（Ta_0.5Sb_0.5）O₃	8.30	82.30
BNBT-0.075BiScO₃	0.46	47.91
BNBT-0.15La	0.60	86.00
BNBT-0.11Sr₅LaTi₃Ta₇O₃₀	1.21	94.04

Fig.1 XRD patterns of different ceramic samples

Fig.2 SEM images of different ceramic samples

Fig.3 Temperature dependence of dielectric constant and dielectric loss of different ceramic samples

Fig.4 Modified Curie-Weiss fitting curves of different ceramic samples at 1 kHz

Fig.5 Ferroelectric and energy-storage properties of different ceramic samples

Fig.6 Pmax，Pr and ΔP of different ceramic samples at 4 kV/mm

Table 2 Comparison of diffuseness coefficient and energy-storage parameters of different ceramic samples

Sample	γ	W_rec/（J·cm^-3）	η/%	E_b/（kV·mm^-1）	ΔP/（μC·cm^-2）
BNBT	1.89	0.13	36.8	5.0	10.56
BNBT-Bi	1.91	0.29	51.4	6.0	13.86
BNBT-Sm	1.92	0.21	49.4	5.8	13.46
BNBT-La	1.91	0.22	49.3	5.3	14.26
BNBT-Gd	1.83	0.16	24.2	5.5	12.74

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Effect of Sr_0.7M_0.2TiO₃(M=Bi, Sm, La, Gd) Doping on Properties of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ Ceramic Energy-Storage Materials

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