概括
拉曼光谱显示,高压将协调转化为液态,从四面体结构转变为八面体结构. 这种结构变化可能会影响地球深处的酸盐行为.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 矿物物理 矿物物理
背景情况:
- 了解酸盐在高压下化的行为对于理解地球地幔内的地质过程至关重要.
- 芽酸 (Na(2)Ge(2)O(5).H(2)O) 由于结合和协调化学的相似性,可以作为酸融结构的相关模拟物.
研究的目的:
- 通过拉曼光谱学研究液态基的压力诱导的结构演变.
- 为了确定协调的变化 (四面体与八面体) 作为施加压力的函数.
主要方法:
- 拉曼光谱法被用来探测液体样本的振动模式.
- 在高达2.2千兆帕斯卡尔的压力下进行了实验,以观察结构过渡.
主要成果:
- 接近240波数的峰值强度显著增加,归因于八面体GeO(6) 组,观察到压力增加.
- 500波数附近的峰值的强度相应下降,与四面体GeO(4) 组相关,表明协调的转变.
- 八面体的比例从近0%的环境压力增加到超过50%的2.2千兆帕斯卡尔.
结论:
- 高压诱导了由四面体到八面体协调的转变为在液态中.
- 这些发现表明,在地球深处发现的高压下,酸盐化物可能会经历类似的协调变化.
- 这种结构变化可能会影响酸盐聚变斜率,并导致在地幔过渡区中形成中性浮性岩石.
更多相关视频
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
08:42High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
Published on: October 10, 2014
相关概念视频
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
03:06Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals