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Abstract <p>The influence of superstoichiometric additives (1-2&#xa0;wt.% of MnO<sub>2</sub> and Li<sub>2</sub>CO<sub>3</sub>) on the properties of 0.7BiFeO<sub>3</sub>–0.3BaTiO<sub>3</sub> (BFBT) ceramics is studied. It is shown that both additives cause a rhombohedral-to-pseudocubic structural phase transition; the stabilization is achieved at 2% MnO<sub>2</sub> and already at 1% Li<sub>2</sub>CO<sub>3</sub>. The Mn-containing samples demonstrate smaller grain sizes (down to ~3&#xa0;µm) and higher densities, whereas Li-doped samples exhibit larger grain sizes (up to 7-9&#xa0;µm) and the presence of liquid-phase layers. All the modified materials exhibit a relaxor-type phase transition. The maximum diffuseness parameter (γ&#xa0;=&#xa0;1.97) is demonstrated by the sample containing 2% MnO<sub>2</sub>. The piezoelectric modulus increases up to <i>d</i><sub>33</sub>&#xa0;≈&#xa0;130&#xa0;pC/N and decreases down to 20-40&#xa0;pC/N upon MnO<sub>2</sub> and Li<sub>2</sub>CO<sub>3</sub> doping, respectively. The most promising material is the BFBT&#xa0;+&#xa0;2% MnO<sub>2</sub> composition characterized by a stable pseudocubic structure, low conductivity, and high piezoresponse.</p>

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Influence of Superstoichiometric Doping on the Crystal Structure and Electrophysical Characteristics of 0.7BiFeO3–0.3BaTiO3 Solid Solutions

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • A. A. Zabolotnyi,
  • O. Yu. Grapenko,
  • V. A. Burumov,
  • K. M. Zhidel,
  • A. V. Nazarenko,
  • N. A. Boldyrev

摘要

Abstract

The influence of superstoichiometric additives (1-2 wt.% of MnO2 and Li2CO3) on the properties of 0.7BiFeO3–0.3BaTiO3 (BFBT) ceramics is studied. It is shown that both additives cause a rhombohedral-to-pseudocubic structural phase transition; the stabilization is achieved at 2% MnO2 and already at 1% Li2CO3. The Mn-containing samples demonstrate smaller grain sizes (down to ~3 µm) and higher densities, whereas Li-doped samples exhibit larger grain sizes (up to 7-9 µm) and the presence of liquid-phase layers. All the modified materials exhibit a relaxor-type phase transition. The maximum diffuseness parameter (γ = 1.97) is demonstrated by the sample containing 2% MnO2. The piezoelectric modulus increases up to d33 ≈ 130 pC/N and decreases down to 20-40 pC/N upon MnO2 and Li2CO3 doping, respectively. The most promising material is the BFBT + 2% MnO2 composition characterized by a stable pseudocubic structure, low conductivity, and high piezoresponse.