以50mol％PbO为助溶剂,采用溶剂-坩埚下降法生长了Pb[(Zn1/3Nb2/3)0.93Ti0.07]O3(PZNT93/7)弛豫铁电单晶.为了控制成核,我们在坩埚底部设计了一个通气装置以诱导自发成核.晶体在Pt坩埚中生长,坩埚尺寸为40mm×40mm×300mm,下降速率为0.5mm/h,通气流量为1～1.6L/min.所得晶体最大尺寸达φ30mm×25mm.该晶体具有明显的结晶学形貌.X射线定向表明,其主要显露面为(001).由于气流不稳定以及质量输运较慢,晶体内部容易形成一些红色PbO包裹.介电和铁电性能研究表明,该晶体的性能能够满足新型医疗诊断设备对阵列换能器的要求.
Relaxor ferroelectric single crystal Pb[(Zn1/3Nb2/3)0.93Ti0.07]O3 (PZNT93/7) was grown by a flux-Bridgman method using 50mol% PbO as the flux. Nucleation
was modified by O2 gas cooling system at the bottom of Pt crucible. The size of the crucible was 40mm×40mm×300mm. The rate of pulling-down
was 0.5mm/h and the rate of oxygen fluid was 1～1.6L/min. The maximum size of the obtained crystals was φ30mm×25mm. The as-grown PZNT crystal exhibits
an obvious growth morphology and the largest revealed face is (001) determined by X-ray diffraction. Due to unstability of O2 fluid and slow mass transport,
red PbO inclusions are easily formed in the crystal. The measurements of dielectric and ferroelectric properties show that the crystal can satisfy the requirements
of array-type transducers in a new type of medical diagnostic equipment.
参考文献
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| [2] | Ajmal K, Frank A M. J. Am. Ceram. Soc., 1999, 82 (11): 2958--2962. [2] Harada K, Shimanuki S, et al. J. Intell. Mater. Syst. & |
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