Scholarlink

<p>The structural, microstructural, dielectric, ferroelectric, and electrocaloric properties of 0.94 Na<sub>0.5</sub>Bi<sub>0.5 − <i>x</i></sub>Nd<sub><i>x</i></sub>TiO<sub>3</sub>-0.06BaTiO<sub>3</sub> (<i>x</i> = 0 &amp; 0.25)ceramics were investigated to evaluate the influence of Nd<sup>3</sup>⁺ substitution on phase evolution and functional performance. X-ray diffraction confirmed a perovskite structure with coexisting monoclinic (Cc) and tetragonal (P4mm) phases, with Nd substitution promoting a morphotropic phase boundary (MPB). Rietveld refinement revealed an increased contribution of the tetragonal phase (38%) at <i>x</i> = 0.25. SEM analysis showed dense microstructures with refined grains and enhanced densification. Dielectric measurements indicated relaxor behavior with diffuse phase transitions and improved thermal stability upon Nd doping. P–E hysteresis and strain loops confirmed stable ferroelectricity and reduced coercive fields, with squareness values close to ideal loops. Electrocaloric studies exhibited a peak ΔT of 1.51&#xa0;K at 50&#xa0;kV/cm, while energy storage efficiency reached ~ 80% at 160&#xa0;°C for <i>x</i> = 0.25. These findings demonstrate that Nd incorporation significantly enhances electrocaloric and energy storage performance, making the system promising for environmentally friendly solid-state cooling and high-efficiency capacitor applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Collating electro caloric and energy storage properties of lead free 0.94 Na0.5Bi0.5 − xNdxTiO3-0.06BaTiO3 (x = 0 & 0.25) ceramics for solid-state refrigeration

  • 期刊论文

  • 发表日期：

    2025年10月25日

查看全文
  • T. Venkata Narmada,
  • D. Zarena

摘要

The structural, microstructural, dielectric, ferroelectric, and electrocaloric properties of 0.94 Na0.5Bi0.5 − xNdxTiO3-0.06BaTiO3 (x = 0 & 0.25)ceramics were investigated to evaluate the influence of Nd3⁺ substitution on phase evolution and functional performance. X-ray diffraction confirmed a perovskite structure with coexisting monoclinic (Cc) and tetragonal (P4mm) phases, with Nd substitution promoting a morphotropic phase boundary (MPB). Rietveld refinement revealed an increased contribution of the tetragonal phase (38%) at x = 0.25. SEM analysis showed dense microstructures with refined grains and enhanced densification. Dielectric measurements indicated relaxor behavior with diffuse phase transitions and improved thermal stability upon Nd doping. P–E hysteresis and strain loops confirmed stable ferroelectricity and reduced coercive fields, with squareness values close to ideal loops. Electrocaloric studies exhibited a peak ΔT of 1.51 K at 50 kV/cm, while energy storage efficiency reached ~ 80% at 160 °C for x = 0.25. These findings demonstrate that Nd incorporation significantly enhances electrocaloric and energy storage performance, making the system promising for environmentally friendly solid-state cooling and high-efficiency capacitor applications.