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Production of Magnesium Titanate-Based Nanocomposites via Mechanochemical Method

机译：机械化学法制备钛酸镁基纳米复合材料

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The mechanical activation was employed to study the phase evolution of the Mg-TiO_2-CaHPO_4-CaO nanocrystalline system. The powders mixture with certain weight percent was grinded. Thermal annealing process at 650℃, 900℃ and 1100℃ temperatures resulted in generation of different compounds like MgTiO_3/MgO/Hydroxyapatite (HAp) and MgTiO_3/MgO/β-TCP and MgTiO_3/Mg2TiO_4/MgO/β-TCP, respectively. The compounds were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The consequences of XRD analysis revealed that by increasing temperature, some composites with different morphological and structural features were detected. Beside, due to decomposing of HAp around 800℃, HAp converted to whitlockite (β-TCP) with growth of temperature. According to SEM and TEM observations, it was found that the synthesized powder contained large agglomerates which significant content of finer particles and agglomerates with spherical morphology. Because magnesium titanates based dielectric materials are useful for electrical applications, the electrical property of HAp has been proved, and the incorporation of these materials could result in new nanocrystalline dielectric materials.
机译：利用机械活化研究了Mg-TiO_2-CaHPO_4-CaO纳米晶体系的相演化。将具有一定重量百分比的粉末混合物研磨。分别在650℃，900℃和1100℃的温度下进行热退火，分别生成了MgTiO_3 / MgO /羟基磷灰石（HAp）和MgTiO_3 / MgO /β-TCP和MgTiO_3 / Mg2TiO_4 / MgO /β-TCP等不同的化合物。化合物通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM）和能量色散X射线光谱（EDX）进行表征。 XRD分析的结果表明，通过升高温度，可以检测到一些具有不同形态和结构特征的复合材料。另外，由于800℃左右HAp的分解，随着温度的升高，HAp转化为辉晶石（β-TCP）。根据SEM和TEM观察，发现合成的粉末包含大的附聚物，该附聚物显着含量的细颗粒和具有球形形态的附聚物。因为基于钛酸镁的介电材料可用于电气应用，所以已证明HAp的电性能，并且这些材料的掺入可产生新的纳米晶介电材料。

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