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Bi2Fe4O9 microcrystals with tunable morphologies were prepared through a synergistic combination of ultrasonic and hydrothermal methods. Different ultrasonic time had great impact on the crystallinity and morphology of Bi2Fe4O9 powders. The SEM images showed that Bi2Fe4O9 microcrystals with tunable morphologies from cubes, cuboid, to plates when ultrasonic time was from Oh, 3h, to 8h. And different...
A novel square-plate piezoelectric ultrasonic linear motor operated in two orthogonal first bending vibration modes (B1) is proposed. The piezoelectric vibrator of the linear motor is simply made of a single PZT ceramic plate (sizes: 15 x 15 x 2 mm) and poled in its thickness direction. The top surface electrode of the square ceramic plate was divided into four active areas along its two diagonal...
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