Li-Co ferrite-aluminates as thermally stable isolators for the decimeter range

Abstract

Polycrystalline materials of composition

$$Li0.5(1---\alpha ) Co\alpha Fe1.9---0.1\alpha {\rm A}l0.6(1---\alpha ){\rm O}_4$$

have been prepared with α = 0.004, 0.006, 0.008, 0.010, 0.012, 0.014, 0.016. The forward and reverse losses in a decimeter isolator have been measured as functions of temperature to determine the trend in the resonant line width in the 10-cm range. It is shown that the materials can be used to construct high-power isolators of low temperature coefficient.