Distribution of Sc3+ at the octahedral sites and its effect on the crystal structure of synthetic Sc-bearing clinozoisite on the Ca2Al3Si3O12(OH)-Ca2Al2ScSi3O12(OH) join

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mariko Nagashima, Yoji Morifuku, Boriana Mihailova
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引用次数: 0

Abstract

Synthetic Sc-bearing clinozoisite on the Ca2Al3Si3O12(OH)-Ca2Al2Sc3+Si3O12(OH) join was studied by single-crystal X-ray diffraction to understand better the distribution of Sc3+ among the octahedral sites, M1-M3, and its effect on the structure of epidote-group minerals. Oxide starting materials of Ca2Al2(Al1-p)ScpSi3O12.5 composition with p = 0.5 and 1.0 were employed, and clinozoisite was successfully synthesized at PH2O = 1.2–1.5 GPa and T = 700–800 °C. The Sc content in clinozoisite varies and attains 0.61 atoms per formula unit (apfu) from p = 1.0 starting material. Two Sc-bearing clinozoisite crystals from the product of p = 0.5 starting material (Run 20) were used for X-ray crystal structural analysis. The unit-cell parameters are a = 8.8815(4), b = 5.6095(2), c = 10.1466(5) Å, β = 115.318(6)º, and V = 457.0(1) Å3 for 20B, and a = 8.885(1), b = 5.6119(4), c = 10.153(1) Å, β = 115.27(2)º, and V = 457.9(4) Å3 for 20D. The resulting Sc3+ occupancies among the octahedral sites are M1Al1.0M2Al1.0M3(Al0.684(7)Sc3+0.316) for the former and M1Al1.0M2Al1.0M3(Al0.629(6)Sc3+0.371) for the latter, i.e., Sc3+ exclusively occupies M3. The mean ionic distance of < M3–O > increases with increasing Sc content at M3, but it tends to be slightly shorter than the expected value using the regression line based on the structural data of synthetic Ca2(Al, Me3+)3Si3O12(OH) clinozoisite. It is due to the reduced distortion of M3O6 octahedra caused by the short M3–O1 and M3–O8 distances. Although the angular variance ends up at a similar value to the Al-Fe3+ epidote, the variation of ∠Oi–M3-Oi angles is different. The Sc-bearing clinozoisite has greater ∠O1–M3–O1’, but smaller ∠O2–M3–O2’ and ∠O2–M3–O4 relative to Al-Fe3+ series ones. Due to different local chemical surroundings, multiple peaks are present in the OH stretching region of Raman spectra. Three OH-stretching peaks, centered at 3342, 3382, and 3468 cm−1 are assigned to the local configuration O10–H···O4–(M1AlM1AlM3Sc3+) and O10–H···O4–(M1AlM1AlM3Al), and O10–H···O2, respectively.

Abstract Image

八面体位点上 Sc3+ 的分布及其对 Ca2Al3Si3O12(OH)-Ca2Al2ScSi3O12(OH)连接上合成含 Sc 的黝帘石晶体结构的影响
通过单晶 X 射线衍射研究了在 Ca2Al3Si3O12(OH)-Ca2Al2Sc3+Si3O12(OH) 连接上合成的含 Sc 的黝帘石,以更好地了解 Sc3+ 在八面体位点 M1-M3 之间的分布及其对闪石族矿物结构的影响。我们采用了成分为 Ca2Al2(Al1-p)ScpSi3O12.5 的氧化物起始材料(p = 0.5 和 1.0),并在 PH2O = 1.2-1.5 GPa 和 T = 700-800 °C 的条件下成功合成了黝帘石。黝帘石中的 Sc 含量不尽相同,p = 1.0 的起始材料中的 Sc 含量达到了 0.61 个原子/式单位(apfu)。从 p = 0.5 起始材料(Run 20)的产物中提取的两块含 Sc 的黝帘石晶体被用于 X 射线晶体结构分析。20B 的单位晶胞参数为 a = 8.8815(4)、b = 5.6095(2)、c = 10.1466(5) Å、β = 115.318(6)º 和 V = 457.0(1) Å3;20D 的单位晶胞参数为 a = 8.885(1)、b = 5.6119(4)、c = 10.153(1) Å、β = 115.27(2)º 和 V = 457.9(4) Å3。由此得出的 Sc3+ 在八面体位点中的占有率为:前者为 M1Al1.0M2Al1.0M3(Al0.684(7)Sc3+0.316),后者为 M1Al1.0M2Al1.0M3(Al0.629(6)Sc3+0.371),即 Sc3+ 只占有 M3。随着 M3 处 Sc 含量的增加,< M3-O >的平均离子间距也在增加,但它往往比根据合成 Ca2(Al,Me3+)3Si3O12(OH)clinoisite 结构数据的回归线得出的预期值略短。这是由于 M3-O1 和 M3-O8 距离较短导致 M3O6 八面体的变形减少。虽然角度方差的最终值与 Al-Fe3+ 辉石相似,但∠Oi-M3-Oi 角的变化却不同。相对于 Al-Fe3+ 系列,含 Sc 的黝帘石具有更大的∠O1-M3-O1',但∠O2-M3-O2'和∠O2-M3-O4 则较小。由于局部化学环境的不同,拉曼光谱的 OH 伸缩区域出现了多个峰。以 3342、3382 和 3468 cm-1 为中心的三个 OH 伸缩峰分别归属于局部构型 O10-H--O4-(M1AlM1AlM3Sc3+)和 O10-H--O4-(M1AlM1AlM3Al)以及 O10-H--O2。
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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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