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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Effect of oxygen content on the Si-29 NMR, Raman spectra and oxide ion conductivity of the apatite series, La8+xSr2-x(SiO4)(6)O2+x/2
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Effect of oxygen content on the Si-29 NMR, Raman spectra and oxide ion conductivity of the apatite series, La8+xSr2-x(SiO4)(6)O2+x/2

机译：氧含量对磷灰石系列La8 + xSr2-x（SiO4）（6）O2 + x / 2的Si-29 NMR，拉曼光谱和氧化物离子电导率的影响

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摘要

Si-29 NMR data have been recorded for the apatite series La8+xSr2-x(SiO4)(6)O2+x/2 (0 <= x <= 1.0). For x = 0, a single NMR peak is observed at a chemical shift of approximate to-77 ppm, while as the La : Sr ratio and hence interstitial oxygen content is increased, a second peak at a chemical shift of approximate to-80 ppm is observed, which has been attributed to silicate groups neighbouring interstitial oxide ions. An increase in the intensity of this second peak is observed with increasing x, consistent with an increase in interstitial oxide ion content, and the data are used to estimate the level of interstitial oxide ions, and hence Frenkeltype disorder in these materials. The increase in second Si-29 NMR peak intensity/interstitial oxide ion content is also shown to correlate with an increase in conductivity. The effect of interstitial oxygen content can also be studied by means of Raman spectroscopy, with a new mode at 360 cm(-1) appearing for samples with x > 0 in the symmetric bending mode energy region of the SiO4 group. The intensity of this mode increases with increasing oxygen content, yielding results comparable to those from the NMR studies, showing the complementarities of the two techniques.
机译：已记录了磷灰石系列La8 + xSr2-x（SiO4）（6）O2 + x / 2（0 <= x <= 1.0）的Si-29 NMR数据。对于x = 0，在大约-77 ppm的化学位移处观察到一个NMR峰，而随着La：Sr比和间隙氧含量的增加，在大约-80 ppm的化学位移处观察到第二个峰观察到，这归因于邻近间隙氧化物离子的硅酸盐基团。观察到第二个峰的强度随x的增加而增加，与间质氧化物离子含量的增加一致，并且该数据用于估算间质氧化物离子的水平，从而估计这些材料中的Frenkeltype紊乱。还显示出第二Si-29 NMR峰强度/间隙氧化物离子含量的增加与电导率的增加相关。间隙氧含量的影响也可以通过拉曼光谱法研究，对于x> 0的SiO4组对称弯曲模式能量区域中的样品，出现360 cm（-1）的新模式。该模式的强度随着氧含量的增加而增加，产生的结果与NMR研究的结果相当，表明了这两种技术的互补性。

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