Is there any substance that have dielectric permittivity of ~80 like water, but do not have absorption in the 1 GHz range, like water?
There are several commercial materials (microwave ceramics) having
large permittivity and low dielectric losses at 1 GHz but, due to my knowledge,
there are no magnetic materials having large permeability and small
magnetic losses at 1 GHz (generally at microwabe frequency range).
All low loss microwave ferrites exhibit low pemeability above the frequency of
their natural ferromagnetic resonace.
J. Krupka Measurements of the complex permittivity, the initial permeability, permeability tensor and ferromagnetic linewidth of gyromagnetic materials
Measurement Science and Technology (2018)
Perhaps you should look at high-Q ceramics, e.g.
Low-loss dielectric ceramic materials and their properties
M. T. Sebastian, R. Ubic & H. Jantunen
https://www.tandfonline.com/doi/abs/10.1179/1743280415Y.0000000007?journalCode=yimr20
You may try BaO-Sm2O3-TiO2 system can give permittivity 60-85 based upon different stoichiometry.
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