The tungsten bronze type solid solution systems, Sr _ ( 1 - x ) Ba _ xNb _ 2 O _ 6 ( SBN ) and ( K _ yNa _ ( 1 - y )) 0.4 ( Sr - ( 1 - x ) Ba _ x ) 0.8 Nb _ 2 O _ 6 ( KNSBN ), areimportant photorefractive materials with enormous potentialities.

Sr_ ( 1-x ) Ba_xNb_2O_6 ( SBN ) 和 ( K_yNa_ ( 1-y ))0.4 ( Sr_ ( 1-x ) Ba_x ) _0.8Nb_2O_6 ( KNSBN ) 两种钨青铜型晶体是很有发展前途的光折变材料.

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