We fabricated a ferroelectric Bi(4-x)Ce(x)Ti(3)O(12) thin film library by solid-state mixing of Bi(2)O(3)/CeO(2)/TiO(2) multilayers using a multitarget rf magnetron sputtering equipped with an automated shutter. Polarization-electrical field and the structure are mapped as a function of Ce content (x) from 0 to 4. The remnant polarization decreases as Ce content increases, and at x >= 0.8, Bi(4-x)Ce(x)Ti(3)O(12) samples exhibit a paraelectric property due to the formation of impurity phases such as Bi(2)Ti(2)O(7) and CeO(2). Among the thin film samples of the library, Bi(3.85)Ce(0.15)Ti(3)O(12) exhibited the largest remnant polarization of 13.0 mu C/cm(2). (C) 2008 American Institute of Physics.