their flat response in a broad spectrum, no need for cooling accessories, relatively fast response and low cost compared with photodetector, and are applied to a wide range of applications such as nondestructive motion detection, IR/THz material analysis, gas/flame monitoring and laser measurement ...
The lowest-frequency polar phonon undergoes partial softening down to ~ 0.1 THz near Tc = 440 K in both ceramics, but the dielectric anomaly is caused predominantly by flipping and breathing of polar nanoclusters. Due to contribution of both the soft phonon mode and dielectric relaxations into ...
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