MNR Spectra of Magma-related Compounds at Their Molten States.

熔融状态下岩浆相关化合物的 MNR 光谱。

• 批准号: 63470026
• 负责人: YOKOKAWA Toshio
• 金额: $ 4.35万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63470026/
• 关键词: High temperature NMR; NMR; Silicate glass; Silicate melts; Magma; けい酸塩ガラス; けい酸塩融体

The purpose of the present study is to elucidate the structure and dynamic properties of alkali and alkalialunino silicates, as model materials of magmas, by means of ^<29>Si, ^<27>Al and ^<17>O NMR spectroscopy.A high temperature NMR probe made of platinum resistance wire, high purity alumina and zirconia was constructed and operated in a Bruker MSL 200 NMR spectrometer from room temperature to 1200 ﾟC.^<29>Si NMR spectra of the sodium silicate glass were composed of contribution from individual silicate network units in accordance with their relative difference of chemical shift anisotropy. The spectra show narrowing above glass transition temperature. In the liquid state a single and sharp profile of Lorentzian type was observed. The temperature dependence of line shape could be understood by computer simulation assuming exchange reaction among structural units in silicate glasses and melts. The activation energy of the exchange reaction coincided with that of viscous flow.The construction of a new probe for measurement of ^<27>Al and ^<17>O is in progress.

本文利用~（13）Si、~（13）Al和~（13）O核磁共振谱研究了碱性硅酸盐和碱性铝硅酸盐的结构和动力学性质<29><27><17>。用铂电阻丝、高纯氧化铝和氧化锆制成高温核磁共振探针，在Bruker MSL 200型核磁共振谱仪上进行了室温至1200 ℃的工作。<29>硅酸钠玻璃的硅核磁共振谱是由硅酸盐网络单元的贡献组成的，这与它们的化学位移各向异性的相对差异是一致的。光谱显示在玻璃化转变温度以上变窄。在液体状态下，观察到一个单一的和尖锐的洛伦兹型的轮廓。在硅酸盐玻璃和熔体结构单元之间发生交换反应的情况下，通过计算机模拟可以理解谱线形状与温度的关系。交换反应的活化能与粘流反应的活化能一致<27><17>。

项目成果

Q.Xu: "Local Structure around Ni^<2+> Ions in Sodium Borate Glasses." Phys.Chem.Glasses(in press). 31. (1990)

Q.Xu：“硼酸钠玻璃中 Ni^<2> 离子周围的局域结构。”

A. Sasahira, et al.: "Pb^<2+>/Pb^0 Redox Equilibria in Sodium Barate, Silicate, and Aluminosilicate Melts." J. Electrochem. Soc., 136, 1861-1864, 1989.

A. Sasahira 等人：“巴拉酸钠、硅酸盐和铝硅酸盐熔体中的 Pb^2/Pb^0 氧化还原平衡”。

H. Ogawa, et al.: "Molecular Dynamics Study on the Shear Viscosity of Molten Na_2O-2SiO_2." J. Non-Cryst. Solids, 1990.

H. Okawa 等人：“熔融 Na_2O-2SiO_2 剪切粘度的分子动力学研究”。

S. Shimokawa, et al.: "A High Temperature (1200ﾟC) Prove for NMR Experiments and Its Application to Silicate Melts." Chem. Letters, 1990.

S. Shimokawa 等人：“核磁共振实验的高温 (1200°C) 证明及其在硅酸盐化学中的应用”，1990 年。

Y.Nakamura: "Chemical Modification of Liquid Semiconductors:The As_2Te_3-Tl and As_2Te_3-Bi Systems." J.Non-Cryst.Solids. (1990)

Y.Nakamura：“液体半导体的化学改性：As_2Te_3-Tl 和 As_2Te_3-Bi 系统。”