Phase Evolution, Microstructure, Electrical, and Magnetic Properties of Bi0.5(Na0.68K0.22Li0.10)0.5TiO3 Ceramics with Fe3+ Substitution,Physica Status Solidi (A) - Applications and Materials Science

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Phase Evolution, Microstructure, Electrical, and Magnetic Properties of Bi0.5(Na0.68K0.22Li0.10)0.5TiO3 Ceramics with Fe3+ Substitution
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-03-07 , DOI: 10.1002/pssa.201900983
Pamornnarumol Bhupaijit ₁ , Pinit Kidkhunthod ₂ , Sanu Kumar Gupta ₃ , Noppadon Nuntawong ₄ , Sasipohn Prasertpalichat _{1,

5} , Supree Pinitsoontorn ₆ , Mati Horprathum ₄ , Theerachai Bongkarn _{1,

5}

Affiliation

Herein, the effect of Fe³⁺ ions substitution on the phase evolution, microstructure, electrical, and magnetic properties of Bi_0.5(Na_0.68K_0.22Li_0.10)_0.5Ti_1−xFe_xO₃ (BNKLT‐x Fe) ceramics with 0 ≤ x ≤ 0.020 is investigated. The BNKLT‐x Fe ceramics are synthesized via the solid‐state combustion method. All BNKLT‐x Fe compositions use a calcination temperature of 750 °C for 2 h and a sintering temperature of 1025 °C for 2 h. The X‐ray diffraction (XRD) and Raman spectra illustrate coexisting rhombohedral (R) and tetragonal (T) phases in all compositions and the R phase increases with increasing Fe content. The X‐ray absorption spectroscopy (XAS) technique confirms that the local R symmetry increases from 38.8% to 67.0% with increasing x content from 0 to 0.020. The average grain size gradually increases from 0.52 to 0.84 μm when the x content increases from 0 to 0.020. At x = 0.010, the ceramic has high ferroelectric properties (P _r ≈ 26.8 μC cm⁻², E _c ≈ 20.4 kV cm⁻¹) and the highest normalized strain (

d_{33}^{*}

) of 386 pm V⁻¹. In addition, the maximum value of the temperature‐dependent dielectric constant of 6136 is found at x = 0.015. Although BNKLT‐0Fe ceramic show diamagnetic behavior, paramagnetic behavior is observed in all Fe³⁺ substituted samples.

中文翻译：

具有Fe3 +取代的Bi0.5（Na0.68K0.22Li0.10）0.5TiO3陶瓷的相变，微观结构，电磁性能

本文中，Fe ³⁺离子取代对Bi _0.5（Na _0.68 K _0.22 Li _0.10）_0.5 Ti _{1− x} Fe _x O ₃（BNKLT‐ x Fe）陶瓷的相演化，微观结构，电学和磁性能的影响0≤ X ≤0.020进行了研究。BNKLT- x Fe陶瓷是通过固态燃烧方法合成的。所有BNKLT‐ xFe组合物使用750°C的煅烧温度2 h，使用1025°C的烧结温度2 h。X射线衍射（XRD）和拉曼光谱表明，在所有成分中均存在菱形（R）和四方（T）相，并且R相随铁含量的增加而增加。X射线吸收光谱（XAS）技术证实，随着X含量从0增大到0.020 ，局部R对称性从38.8％增加到67.0％。当x含量从0增加到0.020时，平均晶粒尺寸从0.52增加到0.84μm。在X = 0.010，陶瓷具有高的铁电特性（P _{- [R} ≈26.8μC厘米^-2，ê _Ç ≈20.4千伏厘米^-1）和最高归一化应变（