SAW Propagation Characteristics on Li2B4O7

Lithium tetraborate (Li2B4O7) was reported as a new piezoelectric material which has zero temperature coefficient of delay (TCD) and moderately high coupling coefficient (k2). This paper estimates SAW propagation properties (k2 and TCD) on Li2B4O7 over the full cuts and propagation directions. Further, the TCD dependency on aluminum layer is also assessed, considering construction of a SAW device with aluminum electrodes. As a result, it is found that there is a region of zero TCD and high coupling coefficient (1%).