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A new actuator called RAINBOW is presently intensively studied because of the extremely large displacement that it is able to generate. The aim of the present work is to fully characterise the performances of this kind of actuator in terms of voltage, frequency and temperature dependence of both maximum displacement and force generated. These results will be compared with the performances shown in the literature for some other traditional piezoelectric actuators. The present work explores two types of compositions for RAINBOWS fabrication: electrostrictive based on PLZT and ferroelectric PZT-based. Results show that this actuator can be engineered on their thickness to optimise the performances. Maximum displacement and generated force increase in a rate of 7446 10(EXP-12) mV and 2.9 N/kV, respectively, per mm of increase of disk diameter. The change with frequency of these properties along 0.01 Hz to 500 Hz range keeps within 20 % for maximum displacement and 10 % for blocking force. Thermal stability of the performances shows an unexpected 50 % of variation through the studied range from -40 degrees C up to 50 degrees C.