Application of Single-crystalline PMN-PT and PIN-PMN-PT in High-Performance Pyroelectric Detectors

The suitability for use in pyroelectric detectors of single-crystalline doped and undoped lead indium niobate- lead magnesium niobate-lead titanate was tested and compared with high-quality Mn-doped lead magnesium niobate- lead titanate and standard lithium tantalate. Pyroelectric and dielectric measurements confirmed an increased processing and operating temperature range because of the higher phase transitions of lead indium niobate-lead magnesium niobate-lead titanate. Pyroelectric coefficients of 705 to 770 μC/m²·K were obtained with doped and undoped lead indium niobate-lead magnesium niobate-lead titanate, which are about 70% to 80% of the pyroelectric coefficient of lead magnesium niobate-lead titanate but 4 times higher than standard lithium tantalate. Manganese doping has been proved as a solution to decrease the dielectric loss of lead magnesium niobate-lead titanate and it also works well for lead indium niobate-lead magnesium niobate-lead titanate. An outstanding specific detectivity D* of about 1.1·10⁹ cm·Hz^1/2/W was achieved at a frequency of 2 Hz for Mn-doped lead magnesium niobate-based detectors.