We studied the pyroelectric properties of lead titanate-zirconate (PZT)-based layers prepared with standard procedures of thick film technology (950 degrees C peak temperature) on alumina substrate and with buried interdigital electrodes. The investigation was aimed at setting adequate procedures, and at identifying sample configurations, for measuring the relevant pyroelectric quantities rather than to optimize the material pyroelectric performances. The results show that the pyroelectric coefficient of our porous layers (similar to 1.2 +/- 0.1 x 10(-4) C/m(2) K) is lower than that of ceramic (similar to 3.8 x 10(-4) C/m(2) K) and dense thick-films (similar to 2 x 10(-4) C/m(2) K) of comparable composition, but the thermal properties of our samples (low heat capacity and thermal conductivity) as well as the low relative dielectric constant result in figures of merit better than the corresponding values either for ceramic PZT or other pyroelectric materials (including TGS and LiTaO3). Hence, porous ferroelectric thick-films are good candidate for new pyroelectric devices. (C) 1999 Elsevier Science S.A. All rights reserved.
The authors studied the pyroelectric properties of lead zirconate titanate (PZT)-based layers prepared with standard procedures of thick-film technol. (950° peak temperature) on an alumina substrate and with buried interdigital electrodes. The investigation was aimed at setting adequate procedures and at identifying sample configurations, for measuring the relevant pyroelectrical quantities rather than to optimize the material pyroelectrical performances. The results show that the pyroelectric coefficent of the authors' porous layers (approximately 1.2 +- 0.1 x 10-4 C/m2 K) is lower than that of the ceramic (approximately 3.8 x 10-4 C/m2 K) and dense thick films (approximately 2 x 10-4 C/m2 K) of comparable composition, but the thermal properties of their samples (low heat capacity and thermal cond.) as well as the low relative dielectric constant result in figures of merit better than the corresponding values either for ceramic PZT or other pyroelectic materials (including TGS and LiTaO3). Hence, the porous ferroelectric thick films are good candidates for new pyroelectric devices.
Pyroelectricity in PZT-based thick-films / G., De Cicco; Morten, Bruno; D., Dalmonego; Prudenziati, Maria. - In: SENSORS AND ACTUATORS. A, PHYSICAL. - ISSN 0924-4247. - STAMPA. - 76:(1999), pp. 409-415.
Pyroelectricity in PZT-based thick-films
MORTEN, Bruno;PRUDENZIATI, Maria
1999
Abstract
The authors studied the pyroelectric properties of lead zirconate titanate (PZT)-based layers prepared with standard procedures of thick-film technol. (950° peak temperature) on an alumina substrate and with buried interdigital electrodes. The investigation was aimed at setting adequate procedures and at identifying sample configurations, for measuring the relevant pyroelectrical quantities rather than to optimize the material pyroelectrical performances. The results show that the pyroelectric coefficent of the authors' porous layers (approximately 1.2 +- 0.1 x 10-4 C/m2 K) is lower than that of the ceramic (approximately 3.8 x 10-4 C/m2 K) and dense thick films (approximately 2 x 10-4 C/m2 K) of comparable composition, but the thermal properties of their samples (low heat capacity and thermal cond.) as well as the low relative dielectric constant result in figures of merit better than the corresponding values either for ceramic PZT or other pyroelectic materials (including TGS and LiTaO3). Hence, the porous ferroelectric thick films are good candidates for new pyroelectric devices.
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