The interaction of microwaves and microwave sound with the paraelectric system KCl:OH(-)

Paraelectric resonance experiments were performed at K-band on annealed and unannealed commercially grown KCl crystals. From the annealed behavior, it was concluded that the two resonance lines observed at high electric fields are due to OH(-) dipolar impurities normally present in such material with a concentration of one part per million. The low field line often attributed to OH(-) is found to be more complex. It was concluded that the line is influenced by an impurity in addition to OH(-). An experiment was designed to investigate the interaction of microwave sound with material. The strong coupling to the crystal lattice of the electric and elastic dipole moments of the OH(-) impurity permits phonons to interact with the system. The absorption of 8.7 GHz transverse acoustic phonons generated by a quartz transducer was observed.