Electrocaloric device and thermal transfer systems employing the same

A device comprising:

• an electrocaloric device;
• and
• a power supply configured to apply a voltage to said electrocaloric device, wherein
• said electrocaloric device comprises the following electrocaloric material
• x(PbMg0.33Nb0.67O3)+y(PbTiO3)+z(SrTiO3)
• where x, y, and z are each greater than zero and represent respective mol percentages of respective portions of said electrocaloric material, and
• said electrocaloric material increases in temperature upon application of an applied voltage thereto and decrease in temperature upon removal of said applied voltage.

A device comprising:

• an electrocaloric device;
• and
• a power supply configured to apply a voltage to said electrocaloric device, wherein
• said electrocaloric device comprises the following electrocaloric material
• x(PbMg0.33Nb0.67O3)+y(PbTiO3)+z(C)
• where x, y, and z are each greater than zero and represent respective mol percentages of respective portions of said electrocaloric material and C represents a ceramic oxide configured to offset substantially an increase in a dielectric transition temperature attributable to inclusion of PbTiO3 in said electrocaloric material, and
• said electrocaloric material increases in temperature upon application of an applied voltage thereto and decrease in temperature upon removal of said applied voltage.

A device comprising:

• an electrocaloric device;
• and
• a power supply configured to apply a voltage to said electrocaloric device, wherein said electrocaloric device comprises the following electrocaloric material that increases in temperature upon application of an applied voltage thereto and decrease in temperature upon removal of said applied voltage
• x(A)+y(B)+z(C)
• where
• A represents a ceramic oxide of Pb, Mg, and Nb,
• B represents a ceramic oxide of Pb and at least one additional metal selected from Sc, Nb, and Ti,
• C represents a ceramic oxide of Sr and Ti,
• x represents a mol percentage of between about 45 and about 90,
• y represents a mol percentage of between about 10 and about 55, and
• z represents a mol percentage of about 0 where B represents a ceramic oxide of Pb, Sc and Nb, and a mol percentage greater than 0 and less than about 10 where B represents a ceramic oxide of Pb and Ti.