Abstract

A novel lead-free Ba_(1-x)(La,Na)_xTiO₃ (BLNT), (0 ≤ x ≤ 0.08) ferroelectric ceramic with enhanced energy storage density was fabricated by the conventional solid-state method. With an increase in La^3+/Na⁺ content, the energy storage density, efficiency and power density were increased. The samples with (x = 0.08) show recoverable energy storage of (1.07 J/cm3), 3 times higher than that of pure BaTiO₃ ceramics, energy storage efficiency of (87.6%) and power density of 0.314 MW/cm³, 17 times greater than that of pure BaTiO₃ ceramics. Comparison with other lead-free ferroelectric ceramics confirmed the superiority potential of (BLNT-0.08) ceramics for the design of ceramics capacitors for energy storage applications. The effect of La³⁺/Na⁺ contents on the optical properties of BaTiO³ ceramics was studied via UV spectroscopy. The results revealed that the introduction of structure disorder by means of A-site vacancies leading to the creation of shallow defects resulting in narrowing the bandgap energy. This work may provide a simple and powerful method to develop inexpensive energy storage and photovoltaic devices based on ferroelectric ceramics.

摘要

采用常规固态法制备了一种新型的无铅Ba _（1-x）（La，Na）_x TiO ₃（BLNT）（0≤x≤0.08）铁电陶瓷，其储能密度得到了提高。随着La ^{3 + /} Na ⁺含量的增加，储能密度，效率和功率密度均增加。与样品（X = 0.08）表明（1.07焦耳/厘米3），可采储能3倍比纯的BaTiO的更高₃陶瓷，储能效率（87.6％）和0.314毫瓦/平方厘米的功率密度³，17是纯BaTiO _3的三倍陶瓷。与其他无铅铁电陶瓷的比较证实了（BLNT-0.08）陶瓷在储能陶瓷电容器设计中的优越潜力。通过紫外光谱研究了La ³⁺ / Na ⁺含量对BaTiO ³陶瓷光学性能的影响。结果表明，通过A位空位引入结构无序导致浅缺陷的产生，从而导致带隙能变窄。这项工作可以提供一种简单有效的方法来开发基于铁电陶瓷的廉价能量存储和光伏器件。