First principles NMR study of fluorapatite under pressure.

First principles NMR study of fluorapatite under pressure.
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DOI:
10.1016/j.ssnmr.2012.06.002
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发表时间:
2012-07
影响因子:
3.2
通讯作者:
Fornari M
Fornari M
中科院分区:
化学3区
文献类型:
--
作者:
Pavan B;Ceresoli D;Tecklenburg MM;Fornari M

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核磁共振是探测材料局部性质的一种新技术。本文中,我们提出的结果的密度泛函理论(DFT)从头计算的NMR参数的氟磷灰石(FAp),钙正磷酸盐矿物属于磷灰石家族,通过使用GIPAW方法[Pickard和Mauri,2001]。了解压力对磷灰石的局部影响是特别相关的,因为它们在许多固态和生物医学应用中起着重要作用。磷灰石是一种开放的结构,它可以经历复杂的各向异性变形,核磁共振的响应可以解释所施加的压力引起的微观变化。计算的NMR参数与实验数据吻合较好。在静水压力(从-5到+100 kbar)下对材料行为的结构评估表明磷灰石通道的直径收缩,以及NMR屏蔽和压力之间的强相关性,证明了这种技术对核周围化学环境的敏感性,即使是很小的变化。这种理论方法允许探索构成材料的所有不同核,从而为解释实验结果提供了非常有用的指导,特别是对于更具挑战性的核,如43Ca和17O。
NMR is the technique of election to probe the local properties of materials. Herein we present the results of density functional theory (DFT) ab initio calculations of the NMR parameters for fluorapatite (FAp), a calcium orthophosphate mineral belonging to the apatite family, by using the GIPAW method [Pickard and Mauri, 2001]. Understanding the local effects of pressure on apatites is particularly relevant because of their important role in many solid state and biomedical applications. Apatites are open structures, which can undergo complex anisotropic deformations, and the response of NMR can elucidate the microscopic changes induced by an applied pressure. The computed NMR parameters proved to be in good agreement with the available experimental data. The structural evaluation of the material behavior under hydrostatic pressure (from −5 to +100 kbar) indicated a shrinkage of the diameter of the apatitic channel, and a strong correlation between NMR shielding and pressure, proving the sensitivity of this technique to even small changes in the chemical environment around the nuclei. This theoretical approach allows the exploration of all the different nuclei composing the material, thus providing a very useful guidance in the interpretation of experimental results, particularly valuable for the more challenging nuclei such as 43Ca and 17O.
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