采用机械化学法制备了Ni/TiO2纳米复合材料,制备态样品由六角形结构的金红石TiO2和面心立方结构的Ni组成.退火使样品晶格缺陷和内应力减少,Ni晶粒尺寸和饱和磁化强度明显增大.退火后,TiO2的本征发光峰、自由激子及束缚激子引起的发光峰都发生红移,其原因是能带结构的畸变.制备态样品在15 GHz产生强烈的非线性介电共振,并呈现明显的Cole-Cole半圆.当吸收厚度为8mm时,在14-16 GHz范围内的反射损耗值(RL)都超过了-10dB,且在15 GHz处出现最优RL值-32 dB.退火使制备态样品在2.8和5.2 GHz处的自然共振明显加强,2-6 GHz范围的吸波能显著提高.
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