Abstract
Rare-earth calcium oxoborate RCa 4O(BO 3) 3 (R, rare-earth elements; RCOB) (R = Pr, Nd, Sm, Eu, Dy, Ho, Er) bulk single crystals were grown by the Czochralski technique. Their melting temperature increased with a decrement of a rare-earth ion radius in RCOB. Surface acoustic wave (SAW) and pseudo-SAW (PSAW) properties of the RCOB crystal were investigated. The electro mechanical coupling factors k 2 values of NdCOB were the highest of all RCOB crystals. For SAW, k 2 of 0.80% and velocity of 3400 m/s at X-axis propagation were obtained on the Y-cut substrate. For PSAW, 1.95% and 3900 m/s at Y-axis propagation were obtained on the Z-cut substrate. Moreover, the thermal stability of the SAW of NdCOB (TCD = 3 ppm/°C) is equivalent to a quartz crystal (TCD = 0 ppm/°C).
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