The high temperature microwave absorbing efficiency (HTMAE) of xLa_0.9Sr_0.1MnO₃/(1 − x)MgAl₂O₄ composite ceramics was investigated by studying the crystal structure, electrical conductivity, and permittivity. The crystal structure of La_0.9Sr_0.1MnO₃ and MgAl₂O₄ were maintained, but the Mn³⁺ and Al³⁺ ions were exchanged with each other through doping. The conductivity and permittivity of the composite ceramics increased with the increase of La_0.9Sr_0.1MnO₃ content and test temperature. When x = 0.36, the electrical conductivity in La_0.9Sr_0.1MnO₃ significantly enhanced the microwave polarization of the composite ceramics at high temperature. According to transmission/reflection modelling, the composite ceramics with x = 0.24 showed excellent HTMAE near the optimal thickness of 1.8 mm. Although the optimal thickness of the composite with x = 0.36 was reduced to 1.1 mm, the HTMAE was seriously lessened due to an impedance mismatch. xLa_0.9Sr_0.1MnO₃/(1 − x)MgAl₂O₄ are promising as thin and efficient microwave absorbing materials at high temperatures and the microwave permittivity can be further enhanced by adjusting the conductivity of La_0.9Sr_0.1MnO₃.

通过研究晶体结构，电导率和介电常数，研究了xLa _0.9 Sr _0.1 MnO ₃ /（1- x）MgAl ₂ O ₄复合陶瓷的高温微波吸收效率。维持La _0.9 Sr _0.1 MnO ₃和MgAl ₂ O ₄的晶体结构，但通过掺杂使Mn ³⁺和Al ³⁺离子交换。随着La _0.9 Sr _0.1 MnO ₃的增加，复合陶瓷的电导率和介电常数增大。含量和测试温度。当x ＝ 0.36时，La _0.9 Sr _0.1 MnO _3中的电导率显着增强了复合陶瓷在高温下的微波极化。根据透射/反射模型，x = 0.24的复合陶瓷在1.8 mm的最佳厚度附近显示出极好的HTMAE。尽管x = 0.36的复合材料的最佳厚度减小到1.1 mm，但由于阻抗不匹配，HTMAE大大降低了。xLa _0.9 Sr _0.1 MnO ₃ /（1- x）MgAl ₂ O ₄作为在高温下用作薄而有效的微波吸收材料的理想材料，通过调节La _0.9 Sr _0.1 MnO ₃的电导率可以进一步提高微波介电常数。