Experimental evidence of the bulk photovoltaic effect in photorefractive K1
-xLixTa1-yNbyO3 (KLTN) crystals is shown. The dependence of the bulk photov
oltaic effect on the photorefractive impurities type is presented. The curr
ent voltage characteristic is presented for different temperatures. It was
found that, in Fe-doped KLTN crystals at low temperature, the bulk photovol
taic effect is the dominant transport mechanism contributing to the photore
fractive process.