Materials with negative permittivity need to be used at different temperatures, while the negative permittivity behavior affected by large fluctuations in temperature has seldom been studied. In this work, La_0.5Sr_0.5MnO₃ ceramics were prepared by a sol-gel auto-combustion method and subsequent sintering. The negative permittivity behavior, electrical conductivity and reactance of La_0.5Sr_0.5MnO₃ ceramics were systematically studied at various temperatures. The fluctuation in negative permittivity is less than 2.6 % and the dielectric loss (tanδ) is less than 0.2 in the temperature range of 50–600 °C. Based on the key governing properties being achieved, the present work experimentally demonstrates that La_0.5Sr_0.5MnO₃ ceramics, as single-phase oxides, can be used as a feasible alternative metamaterial in a wide temperature range.

具有负介电常数的材料需要在不同的温度下使用，而很少研究受温度大波动影响的负介电常数行为。在这项工作中，La _0.5 Sr _0.5 MnO ₃陶瓷是通过溶胶-凝胶自动燃烧法和随后的烧结制备的。研究了La _0.5 Sr _0.5 MnO ₃陶瓷在不同温度下的负介电常数行为，电导率和电抗。在负介电常数的波动小于2.6％和介电损耗（tanδ δ）在50–600°C的温度范围内小于0.2。基于获得的关键控制性能，本工作实验证明，La _0.5 Sr _0.5 MnO ₃陶瓷作为单相氧化物，可以在较宽的温度范围内用作可行的替代超材料。