Hydrothermal-induced growth of Ca10V6O25 crystals with various morphologies in a strong basic medium at different temperatures
Hydrothermal-induced growth of Ca10V6O25 crystals with various morphologies in a strong basic medium at different temperatures
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DOI：
10.1016/j.materresbull.2012.12.015
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发表时间：
2013-04
影响因子：
5.4
通讯作者：
M. Hojamberdiev;M. S. Bozgeyik;A. Abdullah;M. Bekheet;G. Zhu;Yinglin Yan;Yunhua Xu;K. Okada
中科院分区：
文献类型：
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作者：
M. Hojamberdiev;M. S. Bozgeyik;A. Abdullah;M. Bekheet;G. Zhu;Yinglin Yan;Yunhua Xu;K. Okada
采用水热法在强碱性介质中合成了不同形貌的Ca_（10）V_6 O_（25）晶体。研究了合成溶液pH值、水热反应温度和时间对Ca 10 V6 O25粉体形貌和结晶度的影响。采用X射线衍射仪、扫描电镜、透射电镜、紫外可见分光光度计和振动样品磁强计对粉体进行了表征。实验结果表明，在120°C ~ 180°C水热反应12- 48 h，合成溶液pH≥12.5时，可以得到纯相的Ca_（10）V_（60）O_（25）粉体。Ca_（10）V_（60）O_（25）粉体的形貌与pH值、温度和时间密切相关。在pH=12.5、180°C、48 h条件下合成了Ca 10 V6 O25微球。紫外-可见漫反射光谱表明，Ca_（10）V_（60）O_（25）粉末对紫外光有较好的吸收，吸收边约为380 nm。所有样品都明显表现出超顺磁性行为，剩磁（剩磁）几乎为零。水热合成的Ca_（10）V_（60）O_（25）粉体在电子和生物医学领域具有潜在的应用前景。
The Ca10V6O25crystals with various morphologies were synthesized by a facile hydrothermal method in a strong basic medium. The effects of the pH of synthesizing solution, hydrothermal reaction temperature and time on the morphology and crystallinity of Ca10V6O25powders were investigated. The as-synthesized powders were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–vis spectrophotometer and vibrating sample magnetometer. The experimental results demonstrate that phase-pure Ca10V6O25powders could be hydrothermally obtained at temperatures ranging from 120°C to 180°C for 12–48h with the pH≥12.5 of synthesizing solution. The morphology of Ca10V6O25powders was strongly dependent on the synthesis parameters, such as pH, temperature and time. The Ca10V6O25microspheres were obtained at 180°C for 48h with the pH=12.5 of synthesizing solution. The UV–vis diffuse reflectance spectra have shown that the Ca10V6O25powders efficiently absorb UV light with an absorption edge at about 380nm. All the samples noticeably exhibit a superparamagnetic behavior with a nearly zero magnetic remanence (remanent magnetization). The hydrothermally synthesized Ca10V6O25powders may be employed as a potential candidate in novel electronic and biomedical applications.