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Single crystal of potassium pentaborate (KB5) has been grown by solution growth technique. FTIR and laser Raman measurements are carried out to make a qualitative analysis on KB5 crystal. Dielectric behaviour of the KB5 crystal has been studied in the microwave region using K-band microwave bench equipped with the Gunn Oscillator guided with rectangular wave-guide. To confirm the suitability of this crystal as electro optic device, its dielectric behaviour with the change of frequency has also been investigated. Photoconductivity studies were also carried out on this material. It was interesting to observe that the KB5 crystal exhibited negative photoconductivity.

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