magnesium silicate

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 碱土金属氧阴离子化合物
• 英文名称: magnesium silicate
• 英文别名: magnesium orthosilicate；anhydrous magnesium silicate；Magnesium;silicate；magnesium;silicate
• 化学式: 2Mg*O₄Si
• 分子量: 140.693
• InChiKey: NNNDGKTWXVKGJQ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -5.52
• 重原子数：
  6
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  92.2
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  magnesium silicate 在 盐酸 作用下， 以 not given 为溶剂， 生成 silica gel
  参考文献：
  名称：

  Allen, E. T.; Wright, F. E.; Clement, J. K., American Journal of Science, 1906, vol. 22, p. 391 - 391

  摘要：

  DOI：
• 作为产物：
  描述：

  magnesium(II) nitrate 在 Petri dish 、 urea 作用下， 以 水 为溶剂， 生成 magnesium silicate
  参考文献：
  名称：

  Photoluminescence and thermoluminescence studies of Mg2SiO4:Eu3+ nano phosphor

  摘要：

  Nanoparticles of Eu3+ doped Mg2SiO4 are prepared using low temperature solution combustion technique with metal nitrate as precursor and urea as fuel. The synthesized samples are calcined at 800 degrees C for 3 h. The Powder X-ray diffraction (PXRD) patterns of the sample reveled orthorhombic structure with alpha-phase. The crystallite size using Scherer's formula is found to be in the range 50-60 nm. The effect of Eu3+ on the luminescence characteristics of Mg2SiO4 is studied and the results are presented here. These phosphors exhibit bright red color upon excitation by 256 nm light and showed the characteristic emission of the Eu3+ ions. The electronic transition corresponding to D-5(0) -> F-7(2) of Eu3+ ions (612 nm) is stronger than the magnetic dipole transition corresponding to D-5(0) -> F-7(1) of Eu3+ ions (590 nm). Thermoluminescence (TL) characteristics of gamma-rayed Mg2SiO4: Eu3+ phosphors are studied. Two prominent and well-resolved TL glows with peaks at 202 degrees C and 345 degrees C besides a shoulder with peak at similar to 240 degrees C are observed. The trapping parameters-activation energy (E), order of kinetics (b) and frequency factor (s) are calculated using glow curve shape method and the results obtained are discussed. (C) 2011 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.jallcom.2011.03.148

文献信息

• Mechanical activation assisted synthesis of pure nanocrystalline forsterite powder
  作者：F. Tavangarian、R. Emadi

  DOI：10.1016/j.jallcom.2009.06.051

  日期：2009.10

  phase nanocrystalline forsterite powder was successfully synthesized by mechanical activation of talc and magnesium carbonate powder mixture followed by annealing. Simultaneous thermal analysis (STA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were utilized to characterize the as-milled and annealed samples. The results showed that a single phase nanocrystalline forsterite

  摘要 通过对滑石粉和碳酸镁粉体混合物进行机械活化和退火，成功合成了单相纳米晶镁橄榄石粉体。同时热分析 (STA)、X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 技术被用来表征研磨和退火的样品。结果表明，球磨后的样品在 1000 ℃、1 h 下退火 10 h 可得到晶粒尺寸为 35 nm 的单相纳米晶镁橄榄石。进一步研磨对镁橄榄石相的结构和微晶尺寸没有显着影响。原子吸收光谱(AAS)分析表明，球磨100 h样品中Fe和Cr的含量分别为0.2838%和0.00175%。
• Synthesis of nanocrystalline forsterite (Mg2SiO4) powder by combined mechanical activation and thermal treatment
  作者：F. Tavangarian、R. Emadi

  DOI：10.1016/j.materresbull.2009.12.032

  日期：2010.4

  This study investigates the synthesis of single-phase nanocrystalline forsterite powder by mechanical activation with subsequent annealing. To produce forsterite powder, a mixture of talc and magnesium oxide powders was first milled by a planetary ball mill, and then annealed at 1000 and 1200 °C for 1 h. The synthesized powder was characterized by X-ray diffraction (XRD), simultaneous thermal analysis

  本研究调查了通过机械活化和后续退火合成单相纳米晶镁橄榄石粉末。为了生产镁橄榄石粉末，首先用行星式球磨机研磨滑石粉和氧化镁粉末的混合物，然后在 1000 和 1200°C 下退火 1 小时。合成的粉末通过 X 射线衍射 (XRD)、同步热分析 (STA)、扫描电子显微镜 (SEM) 和原子吸收光谱 (AAS) 进行表征。机械活化 20 小时后，镁橄榄石结晶的初​​始温度降至约 825 °C。通过机械活化 5 小时并随后在 1000 °C 下退火 1 小时合成的镁橄榄石粉末具有 40 nm 的晶粒尺寸。该样品的粒径小于500nm。
• Microstructure–Dielectric Properties Relationship in Ba_0.6Sr_0.4TiO₃–Mg₂SiO₄–Al₂O₃Composite Ceramics
  作者：Ying Chen、Yuan-Yuan Zhang、Xian-Lin Dong、Gen-Shui Wang、Fei Cao

  DOI：10.1111/j.1551-2916.2009.03376.x

  日期：2010.1

  0.60Ba0.6Sr0.4TiO3(BST)–(0.40−x)Mg2SiO4(MS)–xAl2O3 (x=0, 0.5, 3, 5wt%) composite ceramics exhibit excellent characteristics suitable for tunable device applications. With increasing amount of Al, the dielectric peak can be quantitatively broadened and suppressed; the “phase transition temperature”Tc or (Tm) shifts to a lower temperature. Meanwhile, the tunability is still high in a wider temperature range. Far from Tc, pyroelectric effects are observed by using the Byer and Roundy technology and Slim polarization hysteresis loops are observed under high ac dielectric field at 10Hz. These proved the existence of spontaneous polarization in certain possible orientations in a broad temperature range above Tc in the paraelectric medium and reveal why 0.60BST–(0.40−x)MS–xAl2O3 have such remarkable dielectric nonlinearity.

  0.60Ba0.6Sr0.4TiO3(BST)–(0.40−x)Mg2SiO4(MS)–xAl2O3 (x=0, 0.5, 3, 5wt%) 复合陶瓷材料表现出优异的特性，适用于可调谐设备的应用。随着Al含量的增加，介电峰可以被定量地展宽和抑制；“相变温度”Tc 或 Tm 移向较低温度。同时，在较宽的温度范围内，调谐性仍然保持较高水平。远离 Tc，通过Byer和Roundy技术观察到热释电效应，并在10Hz的高交流电场下观察到Slim极化滞后回线。这些结果证明了在介电材料中，广范围高于 Tc 的温度范围内，存在具有特定可能取向的自发极化，揭示了0.60BST–(0.40−x)MS–xAl2O3 材料为何具有如此显著的介电非线性。
• Personal care compositions comprising coated/treated metal silicate absorbent particles
  申请人：Withiam C. Michael

  公开号：US20060171973A1

  公开（公告）日：2006-08-03

  Coated particles of metal (such as calcium) silicate that exhibit excellent odor neutralization and sebum absorption properties when present within certain cosmetic and/or personal care formulations and suspensions are provided. Uncoated calcium silicate exhibits a high pH level that may have a deleterious effect upon such cosmetic and/or personal care compositions, thereby rendering the overall composition ineffective for its intended purpose, particularly if the calcium silicate is present in its usual state at high loading levels. Alternatively, if certain materials present within personal care compositions exhibit a sufficiently low pH level, the effectiveness of such calcium silicates may be compromised as well. Such novel coated/treated calcium silicates thus permit high loadings of this beneficial odor neutralizing/sebum absorbing additive within cosmetic and/or personal care formulations without causing any appreciable instability issues or viscosity modification concerns or allow for coexistence with such low pH materials without any appreciable reduction in performance capabilities of the calcium silicates themselves. Certain personal care compositions comprising these novel coated calcium silicate particulates are encompassed within this invention as well.

  本发明提供了一种金属(如钙)硅酸盐的涂覆颗粒，当它们存在于某些化妆品和/或个人护理配方和悬浮液中时，表现出优异的除臭和吸油性能。未涂覆的硅酸钙具有较高的pH值，可能会对这些化妆品和/或个人护理组合物产生不良影响，从而使整个组合物对其预期用途无效，特别是如果硅酸钙以高负载水平的常规状态存在。或者，如果个人护理组合物中存在某些物质具有足够低的pH值，这些硅酸钙的效果也可能受到影响。因此，这种新型涂覆/处理的硅酸钙允许高负载这种有益的除臭/吸油添加剂存在于化妆品和/或个人护理配方中，而不会引起任何明显的不稳定问题或黏度修改问题，或者允许与这些低pH物质共存，而不会对硅酸钙本身的性能能力产生任何明显的降低。此外，本发明还包括这些新型涂覆硅酸钙颗粒的某些个人护理组合物。
• Comparative studies on thermoluminescence characteristics of non-doped Mg2SiO4 prepared via a solid-state reaction technique and wet-chemical method: An unusual heating rate dependence
  作者：T. Dogan、S. Akça、M. Yüksel、N. Kucuk、M. Ayvacikli、Y. Karabulut、A. Canimoglu、M. Topaksu、N. Can

  DOI：10.1016/j.jallcom.2019.04.331

  日期：2019.7

  evaluated to clearly reveal TL features. Two TL glow peaks situated at 81 °C and 192 °C were monitored at a heating rate of 2 °Cs−1. We observed anomalous heating rate effect for the peak centered at 192 °C whilst TL intensity of the peak at 81 °C decreases with elevating heating rate. Trap depths of the electrons within the trap centers were found to be 1.04 ± 0.01eV and 1.37 ± 0.01eV for both methods

  摘要 原硅酸镁 (Mg2SiO4) 是通过传统的固态反应和湿化学路线合成的。本研究主要报道了 Mg2SiO4 主体的热释光 (TL) 行为。X 射线衍射图显示 Mg2SiO4 表现出与 JCPDS 卡 900-6398 匹配的正交结构。对 TL 辉光曲线的剂量响应、再现性和陷阱参数进行了评估，以清楚地揭示 TL 特征。在 2°Cs-1 的加热速率下监测了位于 81°C 和 192°C 的两个 TL 辉光峰。我们观察到以 192 °C 为中心的峰的异常加热速率效应，而 81 °C 处的峰的 TL 强度随着加热速率的升高而降低。对于使用峰形 (PS) 方法的两种方法，发现陷阱中心内电子的陷阱深度为 1.04 ± 0.01eV 和 1.37 ± 0.01eV。使用 T max - T stop 方法检查陷阱中心的分布，这种情况表明辉光曲线由单个 TL 峰组成。TL 辉光曲线的强度在高达 20 Gy