摘要
The magnetocaloric effect (MCE) achieved for La_(0.7)Sr_(0.3)MnO_(3)/Ta_(2)O_(5) composites has been investigated. The maximum value of magnetic entropy change of La_(0.7)Sr_(0.3)MnO_(3) composites is found to decrease slightly with the further increasing of Ta_(2)O_(5) concentration. It is shown that La_(0.7)Sr_(0.3)MnO_(3)/Ta_(2)O_(5) composites exhibit much more uniform magnetic entropy change than that of gadolinium. Moreover, the results indicate that the temperature range between 100 K and 400 K can be covered using the La_(0.7)Sr_(0.3)MnO_(3)/Ta_(2)O_(5) composites. Therefore, MCE makes the composites promising for room-temperature magnetic cooling applications.
