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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers & Short Notes >Crystallization of Monodisperse Lead Zirconate Titanate Nanoparticles Produced by Laser Ablation
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Crystallization of Monodisperse Lead Zirconate Titanate Nanoparticles Produced by Laser Ablation

机译：激光烧蚀法制备单分散锆钛酸铅钛酸盐纳米粒子的结晶

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摘要

Monodisperse lead zirconate titanate (PZT) nanoparticles with diameters of 9 nm were produced by laser ablation followed by a gas-phase thermal treatment in combination with a size-classification technique using a very low-pressure differential mobility analyzer. The particles prior to the thermal treatment are amorphous. When the laser power density for ablation increases from 0.5 GW/cm~2 to 12 GW/cm~2, the production yield of the particles increases regardless of the laser photon energy. When the laser photon energy is 3.5 eV, the nanoparticles generated with laser power densities as high as 7 GW/cm~2 are crystallized to perovskite by thermal treatment at 900℃, while those generated with even higher power densities become pyrochlore. In contrast, when the laser photon energy is 2.3 eV, perovskite nanoparticles are obtained only at a power density of 0.5 GW/cm~2. These results reveal that the crystalline structure of PZT nanoparticles can be adjusted to perovskite or pyrochlore by changing thermal treatment temperature, laser power density, and photon energy. Furthermore, X-ray photoelectron spectroscopy indicates that the crystallization to pyrochlore is caused by lead deficiency.
机译：直径为9 nm的单分散钛酸锆钛酸铅（PZT）纳米粒子是通过激光烧蚀，然后进行气相热处理以及使用非常低压差动迁移率分析仪的尺寸分类技术相结合而制成的。热处理之前的颗粒是无定形的。当用于消融的激光功率密度从0.5 GW / cm〜2增加到12 GW / cm〜2时，无论激光光子能量如何，颗粒的产量都会增加。当激光的光子能量为3.5 eV时，通过900℃的热处理将激光功率密度高达7 GW / cm〜2的纳米颗粒结晶成钙钛矿，而功率密度更高的纳米颗粒变成了烧绿石。相反，当激光光子能量为2.3 eV时，仅以0.5 GW / cm〜2的功率密度获得钙钛矿纳米颗粒。这些结果表明，通过改变热处理温度，激光功率密度和光子能量，可以将PZT纳米颗粒的晶体结构调整为钙钛矿或烧绿石。此外，X射线光电子能谱表明，向烧绿石的结晶是铅缺乏引起的。

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