Pyroelectric properties of rare-earth calcium oxyborate crystals: ReCa 4O(BO3)3 (Re: Y, Gd, Nd, and Pr)
RIS ID
126156
Abstract
Pyroelectric properties of the monoclinic ReCa 4 O(BO 3 ) 3 (ReCOB, where Re is rare earth: Y, Gd, Nd, and Pr) single crystals were investigated by the charge integration method in the temperature range of 20°C to 180°C. The two independent pyroelectric coefficients p 1 and p 3 were measured and their temperature-dependent properties were studied; the pyroelectric p1 was found to be negative and decrease with increasing temperature, varying from -59.3, -64.2, -65.5, and -59.5 μC/(m 2· °C) at 30°C to -52.9, -53.3, -46.6, and -50.5 μC/(m 2· °C) at 180°C for YCOB, GdCOB, NdCOB, and PrCOB, respectively, whereas the positive coefficient p3 was observed to decrease from 11.6, 13.6, 23.5, and 31.0 μC/(m 2· °C) at 30°C to 2.5, 7.1, 4.9, and 10.1 μC/(m 2· °C) at 180°C, respectively. In addition, the ReCOB crystals were found to possess relatively high detectivity F d , being 7.6 to 11.4 x 10 -5 Pa -1/2 at 30°C, approximately two times that of commercial triglycine sulfate (TGS) and LiTaO 3 crystals, with minimal variations up to 180°C, indicating the potential for use in thermal imaging applications.
Publication Details
Hou, S., Yu, F., Tang, Y., Zhang, S. & Zhao, X. (2014). Pyroelectric properties of rare-earth calcium oxyborate crystals: ReCa 4O(BO3)3 (Re: Y, Gd, Nd, and Pr). IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 61 (4), 561-566.