Pyroelectric properties in three phases coexistence Pb[(Mn0.33Nb0.67)0.5(Mn0.33Sb0.67)0.5]0.08(ZrxTi1-x)0.92O3 lead ceramics

The bulk dense Pb[(Mn0.33Nb0.67)(0.5)(Mn0.33Sb0.67)(0.5)](0.08)(ZrxTi1-x)(0.92)O-3 pyroelectric ceramics have been successfully prepared by the conventional solid method. The effect of three phases coexistence in the ceramics is studied. When x = 0.95 and 0.85 in the ceramics, the maximum pyroelectric coefficient peaks appear at 23 degrees C and 45 degrees C, and the maximum values are 26.5 x 10(-4) C/m(2) degrees C and 25.5 x 10(-4) C/m(2) degrees C, respectively. The maximum pyroelectric coefficient appears large while the peaks widths are small. When the two kinds of ceramic powders mixed with the mol ratio of 2:1, the pyroelectric coefficient of the ceramics is above 10.0 x 10(-4) C/m(2) degrees C in a broad temperature range from 20 degrees C to 55 degrees C. The possible physical mechanism of the temperature broadened phenomenon is briefly discussed. (C) 2009 Elsevier B.V. All rights reserved.