Abstract

It in has been found in the course of studying the phase transformations of X-ray amorphous titanium hydroxide during its mechanical activation in the presence of additives in the form of zinc compounds that finely ground powders can polymorphically transform into other nonequilibrium crystalline phases. Judging by the increase in the intensity of the peaks in the diffraction patterns, one can state that the amorphous phase crystallizes in the form of anatase and brookite as a result of high-energy exposure. It is shown that the lower the degree of hydration of titanium hydroxide, the higher the efficiency of the mechanical effect of the additive on the phase transformations. The following trend in the effect of the introduced modifier is observed: ZnSO₄⋅7H₂O > Zn(NO₃)₂⋅6H₂O > ZnO. This dependence is determined by the combination of physical and chemical transformations of the material located in the field of intense mechanical influence, confirmed by the calculated data on the crystallite size and microstrains. The conversion of excess mechanical energy into thermal energy initiates chemical processes resulting in the formation of solid titanium-zinc solutions that accelerate the restructuring of the crystal structure upon calcination of the modified titanium hydroxide according to the scheme anatase–brookite–rutile. The obtained results can find practical applications in the production of the so-called “rutile” nuclei used in the industrial production of multipurpose titanium dioxide.

中文翻译：

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氢氧化钛作为功能材料生产的前体

摘要

在研究X射线无定形氢氧化钛在机械活化过程中在锌化合物形式的添加剂存在下的相变过程中已经发现，精细研磨的粉末可以多晶型地转变成其他非平衡结晶相。从衍射图谱中峰强度的增加可以判断，由于高能暴露，非晶相以锐钛矿和板钛矿的形式结晶。结果表明，氢氧化钛的水合度越低，添加剂对相变的机械作用效率越高。在引入的改性剂的效果如下趋势观察：的ZnSO ₄ ⋅7H ₂ O>的Zn（NO ₃）₂ ⋅6H ₂ O>的ZnO。这种依赖性取决于位于强烈机械影响领域的材料的物理和化学转变的组合，并由微晶尺寸和微应变的计算数据证实了这一点。过量的机械能转化为热能会引发化学过程，导致形成固态钛锌溶液，根据锐钛矿-板钛矿-金红石方案，在改性氢氧化钛煅烧时，晶体结构的重组会加速。获得的结果可以在生产用于多功能二氧化钛的所谓“金红石”核中找到实际应用。