Role of La/Pr substitution in modulating the Dielectric and Ferroelectric response of SrBi6Nb2Ti3O21 Aurivillius ceramics

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-04 DOI:10.1016/j.jallcom.2025.184202

Astha Sharma, Prasanjit K. Dey, Oroosa Subohi

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Abstract

This paper reports a comprehensive study of two series of La- and Pr-substituted SrBi₆Nb₂Ti₃O₂₁ (SBNT) ceramics with La/Pr=0.04, 0.06, and 0.08, synthesized via the solid-state reaction route. Phase purity and lattice parameter variations were confirmed through XRD and Rietveld refinement. SEM analysis revealed plate-like grain morphology, while XPS results showed the presence of Pr³⁺, Pr⁴⁺ species in Pr- and a reduction in oxygen vacancies with La/Pr addition. Dielectric properties were studied over a temperature range of RT-750 °C and a frequency range of 20 Hz–1 MHz. An increase in ferroelectric transition temperature from ~667 °C to ~700 °C was observed with La/Pr substitutions. The dielectric responses elucidate an increase in RT dielectric constant by a factor of 11-13 relative to pristine SBNT ceramics in La, x=0.06 (SLBNT-6) and Pr, x=0.08 (SPBNT-8) compositions, respectively. Room-temperature P-E loop measurements showed enhanced remanent polarization (2P_r) in all doped samples compared to the pristine composition. Among these, the La=0.06 (SLBNT-6) and Pr=0.08 (SPBNT-8) compositions demonstrated enhanced ferroelectric polarization, with remanent polarization (2Pr) values of 1.15 μC/cm² and 1.72 μC/cm², respectively. These values represent a threefold and fourfold increase in 2P_r values compared to the pristine SBNT compound. These optimized samples also demonstrated energy storage capability and efficiency, as assessed via RT P-E loop measurements. The maximum energy densities recovered were determined to be 77.97 kJ/m³ and 67.08 kJ/m³ for SLBNT-6 and SPBNT-8 compositions of La³⁺ and Pr³⁺-modified ceramics, respectively.

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La/Pr取代在调节SrBi6Nb2Ti3O21 Aurivillius陶瓷介电和铁电响应中的作用

采用固相法合成了La/Pr分别为0.04、0.06和0.08的两系列SrBi₆Nb₂Ti₃O₂₁（SBNT）陶瓷。通过XRD和Rietveld细化证实了相纯度和晶格参数的变化。SEM分析显示其呈片状晶粒形态，XPS结果显示Pr-中存在Pr3+、Pr4+，并且La/Pr的加入减少了氧空位。在RT-750 °C温度范围和20 Hz-1 MHz频率范围内研究了介电性能。La/Pr取代使铁电转变温度从~667 °C提高到~700 °C。介质响应表明，相对于原始SBNT陶瓷，在La， x=0.06 （SLBNT-6）和Pr， x=0.08 （SPBNT-8）成分中，RT介电常数分别增加了11-13倍。室温P-E环测量显示，与原始成分相比，所有掺杂样品的剩余极化（2Pr）增强。其中，La=0.06 （SLBNT-6）和Pr=0.08 （SPBNT-8）组分表现出较强的铁电极化，剩余极化（2Pr）值分别为1.15 μC/cm²和1.72 μC/cm²。与原始的SBNT化合物相比，这些值代表2Pr值增加了三倍和四倍。通过RT - P-E环路测量，这些优化后的样品还展示了能量存储能力和效率。La3+改性SLBNT-6和Pr3+改性SPBNT-8的最大能量密度分别为77.97 kJ/m3和67.08 kJ/m3。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.