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Investigation into the stability of synthetic goethite after dynamic shock compression 合成鹅绿泥石在动态冲击压缩后的稳定性研究
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-23 DOI: 10.1007/s00269-024-01279-4
Nicholas R. Jenkins, Xuan Zhou, Mithun Bhowmick, Claire L. McLeod, Mark P. S. Krekeler

Goethite (α-FeOOH) is an iron-oxyhydroxide mineral that is commonly found in soils and is of importance within the context of industrial mineralogy and aqueous geochemistry. The structure of goethite is such that vacant rows of octahedral sites form “channels” or nanopores. This study aims to investigate the response of goethite to dynamic shock compression in order to advance our understanding of minerals as potential shock-absorbing media. Shock compression of synthetic goethite powdered samples was achieved by using an inverted shock microscope and laser driven “flyer plates”. With this setup, a high-energy laser launches small  aluminum discs as projectiles or flyer plates at velocities of the order of a few km/s towards the sample. The resulting impact sends a shock wave through the sample, thereby compressing it. The compression is precisely controlled by the plate-impact speed, which in turn is controlled by laser-power. In this work, 25 µm aluminum flyer plates with 3.5 km/s impact velocities were used. The impact resulted in a planar shock wave with shock velocity (Us) ~ 6.78 km/s and an estimated pressure of ~ 41.6 GPa. The shock wave compressed the target goethite for 5 ns. Subsequent, post-shock investigations via transmission electron microscopy (TEM) documented that crystal morphology persisted, and that goethite’s “bird’s nest” texture was maintained. Lattice fringe images revealed localized zones of distortion and amorphous regions within single goethite particles. Raman spectra appear to indicate structural changes after shock compression with the shocked goethite spectra matching that of synthetic hematite. X-ray diffraction (XRD) interestingly identified two major phases: goethite and magnetite. Irrespective of the mineral phases present, the goethite particles persist post shock. A thixotropic-like model for accompanying shock compression is proposed to account for goethite’s shock resistant behavior.

鹅膏石(α-FeOOH)是一种铁氧氢氧化物矿物,通常存在于土壤中,在工业矿物学和水地球化学方面具有重要意义。鹅卵石的结构是空置的八面体位形成 "通道 "或纳米孔。本研究旨在调查鹅绿泥石对动态冲击压缩的响应,以加深我们对矿物作为潜在冲击吸收介质的理解。使用倒置冲击显微镜和激光驱动的 "飞板 "实现了对合成鹅绿泥石粉末样品的冲击压缩。利用这种装置,高能激光以几千米/秒的速度向样品发射作为射弹或飞行板的小铝盘。由此产生的冲击波穿过样品,从而对其进行压缩。压缩量由飞碟冲击速度精确控制,而飞碟冲击速度又由激光功率控制。在这项工作中,使用的是 25 µm 铝质飞板,冲击速度为 3.5 km/s。撞击产生的平面冲击波的冲击速度 (Us) 约为 6.78 km/s,估计压力约为 41.6 GPa。冲击波压缩目标鹅绿石 5 毫微秒。随后,通过透射电子显微镜(TEM)进行的冲击后研究表明,晶体形态依然存在,鹅绿泥石的 "鸟巢 "纹理得以保持。晶格边缘图像显示了单个鹅绿泥石颗粒中的局部变形区和无定形区。拉曼光谱似乎显示了冲击压缩后的结构变化,冲击鹅绿泥石的光谱与合成赤铁矿的光谱相吻合。有趣的是,X 射线衍射 (XRD) 发现了两种主要矿物相:鹅铁矿和磁铁矿。无论存在哪种矿物相,鹅绿泥石颗粒在冲击后都会持续存在。为解释鹅绿泥石的抗冲击行为,提出了一种类似触变性的伴随冲击压缩模型。
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引用次数: 0
Electrical conductivity of siderite and the effect of the spin transition of iron 菱铁矿的导电性和铁的自旋转变的影响
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-23 DOI: 10.1007/s00269-024-01283-8
Izumi Mashino, Takashi Yoshino, Takaya Mitsui, Kosuke Fujiwara, Máté Garai, Shigeru Yamashita

We have conducted electrical conductivity measurements of FeCO3 siderite under high pressure up to 63 GPa in order to understand the nature and effect of iron spin transition and its influence on the geophysical properties of siderite, which is an end-member of major carbonate minerals. The results from Raman and Mössbauer spectroscopic measurements show that the high- to low-spin transition of iron occurs at around 50 GPa in agreement with previous studies. A sharp decrease of the electrical conductivity was also observed at around 50 GP, which is associated with the spin transition in iron. Although the stability of FeCO3 siderite may be limited under high-temperature conditions along with the mantle geotherm, solid solutions in the MgCO3-FeCO3 system, Mg1-xFexCO3, could be stable up to the pressure-temperature condition of the lowermost mantle. The pressure-temperature range of the spin transition in Mg1-xFexCO3 is narrower than those of the major lower mantle minerals, ferropericlase and bridgmanite, and thus the drop of the electrical conductivity induced by the spin transition could be clearer under lower mantle conditions. Therefore, the existence of Mg1-xFexCO3 may affect the observed heterogeneity of electrical conductivity in the mid-lower mantle.

我们在高达 63 GPa 的高压下对 FeCO3 菱铁矿进行了电导率测量,以了解铁自旋转变的性质和效果及其对菱铁矿地球物理性质的影响,菱铁矿是主要碳酸盐矿物的末端成员。拉曼和莫斯鲍尔光谱测量结果表明,铁的高自旋向低自旋转变发生在 50 GPa 左右,这与之前的研究结果一致。在 50 GPa 左右还观察到电导率急剧下降,这与铁的自旋转变有关。虽然随着地幔地温的升高,FeCO3菱铁矿在高温条件下的稳定性可能会受到限制,但 MgCO3-FeCO3 系统中的固溶体 Mg1-xFexCO3 在最下地幔的压力-温度条件下可能是稳定的。Mg1-xFexCO3 的自旋转变的压力-温度范围比主要的下地幔矿物铁闪石和桥芒石的压力-温度范围窄,因此在下地幔条件下,自旋转变引起的电导率下降可能更明显。因此,Mg1-xFexCO3 的存在可能会影响所观测到的中下地幔电导率的异质性。
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引用次数: 0
Dolomite thermal behaviour: A short review 白云石的热行为:简短回顾
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-10 DOI: 10.1007/s00269-024-01272-x
L. C. Resio

In the present review work, it is proposed to carry out a bibliographic analysis about the thermal behaviour of the dolomitic mineral. The state of the art of dolomite currently indicates a growing use as a refractory material due to the cheaper alternative it represents compared to other materials such as magnesium oxide. The importance of dolomite apart from its application in the steel industry lies in the fact that it has expanded to other industrial fields such as the production of catalysts, catalyst supports, and industrial effluent purification materials. In these and other applications, understanding the thermal behaviour of the material is necessary to evaluate the feasibility of application. In this review, the different experimental proposals developed over time in terms of thermal behaviour are studied, emphasizing the reaction mechanisms that have been proposed in different investigations.

在本综述中,建议对白云石矿物的热性能进行文献分析。白云石目前的技术水平表明,它作为耐火材料的用途正在不断扩大,因为与氧化镁等其他材料相比,白云石的价格更低廉。除了在钢铁工业中的应用,白云石的重要性还在于它已扩展到其他工业领域,如催化剂、催化剂载体和工业废水净化材料的生产。在这些和其他应用中,了解材料的热行为对于评估应用的可行性非常必要。在本综述中,我们将研究长期以来在热行为方面提出的不同实验建议,并强调不同研究中提出的反应机制。
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引用次数: 0
Thermal expansion of talc at high temperature and implications for the exhumation of eclogites in subduction zones 滑石在高温下的热膨胀及其对俯冲带斜长岩剥蚀的影响
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-09 DOI: 10.1007/s00269-024-01273-w
Panming Xue, Duojun Wang, Ruixin Zhang, Peng Chen, Kenan Han, Yang Cao

The thermal expansion coefficient of talc has been measured using a high-temperature thermal optical expansion apparatus over a temperature range of 296 to 1473 K. The results show a gradual increase in the thermal expansion coefficient between 296 and 1086 K, and a rapid and substantial increase between 1086 and 1316 K, but exhibit a decline trend between 1316 and 1473 K. At lower temperatures, changes in crystal structure are the primary mechanism governing thermal expansion; at higher temperatures, the dehydration phase transition and the resulting formation of cracks are the primary contributors to thermal expansion. The volume of talc exhibits a linear increase with temperature, described by the equation:(V/{V}_{0}=1+2.153 left( pm 0.011right)times {10}^{-5} left(T-296right)). At high temperatures (573–1073 K), by fitting the expansion data to the Grüneisen thermal equation of state, bulk modulus K0​ = 47.3 ± 0.9 GPa, pressure derivative ({K}_{0}^{{prime }}left(Tright)) = 6.2 ± 0.4, cell volume V0​ = 904.5 ± 0.6 ų, and Debye temperature θ = 829.3 ± 0.6 K were obtained at 0 K. The presence of talc reduces the density of subduction zones, facilitating the exhumation of oceanic eclogites.

使用高温热光学膨胀仪测量了滑石在 296 至 1473 K 温度范围内的热膨胀系数。结果显示,热膨胀系数在 296 至 1086 K 之间逐渐增加,在 1086 至 1316 K 之间快速大幅增加,但在 1316 至 1473 K 之间呈下降趋势。在较低温度下,晶体结构的变化是热膨胀的主要机制;在较高温度下,脱水相变和由此形成的裂缝是热膨胀的主要因素。滑石的体积随温度呈线性增长,其方程为:(V/{V}_{0}=1+2.153 left( pm 0.011right)times {10}^{-5}left(T-296right)).在高温下(573-1073 K),通过将膨胀数据拟合到格鲁尼森热状态方程,体积模量 K0 = 47.3 ± 0.9 GPa,压力导数 ({K}_{0}^{prime }}left(Tright)) = 6.2 ± 0.滑石的存在降低了俯冲带的密度,促进了大洋蚀变岩的吐出。
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引用次数: 0
Experimental studies of charoite mineral transformations under thermal treatment 热处理条件下黑云母矿物转化的实验研究
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-09 DOI: 10.1007/s00269-024-01282-9
A. M. Ionov, O. I. Barkalov, D. A. Shulyatev, K. A. Gavrilicheva

Phase transformations of the charoite mineral induced by thermal treatment at high temperatures were studied by simultaneous monitoring of the thermogravimetry, differential scanning calorimetry, and mass spectrometry curves up to its melting temperature range (~ 1300 °C). The chemical composition and phase state of the initial and melted samples were characterized using electron-probe micro-analysis, X-ray photoemission spectroscopy, X-ray powder diffraction, and Raman spectroscopy. It was demonstrated that continuous heating (10 °C/min) up to ~ 500 °C resulting in a mass loss of ~ 5 wt. % was due to crystallization water release and dehydroxylation, while oxygen release and carbonate inclusion decomposition were observed at a higher temperature. The endothermic peak with a heat effect of 82 J/g observed at 970 ÷ 1050 °C was attributed to the charoite-to-wollastonite transition detected by real-time X-ray powder diffraction in this temperature range. Above 1100 °C, another extended endothermic effect was fixed, which was presumably due to the formation of pseudowollastonite and pre-melting processes. The melting of the charoite sample using the floating zone technique resulted in its transformation to pseudowollastonite and caused a significant color change from lilac to rose pink.

通过同时监测热重仪、差示扫描量热仪和质谱曲线,研究了高温热处理诱导的焦绿泥石矿物的相变,直至其熔化温度范围(约 1300 °C)。利用电子探针显微分析、X 射线光发射光谱、X 射线粉末衍射和拉曼光谱对初始样品和熔化样品的化学成分和相态进行了表征。结果表明,持续加热(10 °C/min )至约 500 °C,导致质量损失约 5 wt. %,这是由于结晶水释放和脱羟基造成的,而在更高温度下则观察到氧释放和碳酸盐包合物分解。在 970 ÷ 1050 °C 温度范围内观察到的热效应为 82 J/g 的内热峰归因于实时 X 射线粉末衍射在此温度范围内检测到的焦土到硅灰石的转变。在 1100 °C 以上,另一个扩展的内热效应被固定下来,这可能是由于假硅灰石的形成和预熔化过程造成的。使用浮区技术熔化夏洛石样品后,夏洛石转变为假硅灰石,并导致颜色从淡紫色明显转变为玫瑰粉红色。
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引用次数: 0
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 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
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-04 DOI: 10.1007/s00269-024-01280-x
Mariko Nagashima, Yoji Morifuku, Boriana Mihailova

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.

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。
{"title":"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","authors":"Mariko Nagashima,&nbsp;Yoji Morifuku,&nbsp;Boriana Mihailova","doi":"10.1007/s00269-024-01280-x","DOIUrl":"10.1007/s00269-024-01280-x","url":null,"abstract":"<div><p>Synthetic Sc-bearing clinozoisite on the Ca<sub>2</sub>Al<sub>3</sub>Si<sub>3</sub>O<sub>12</sub>(OH)-Ca<sub>2</sub>Al<sub>2</sub>Sc<sup>3+</sup>Si<sub>3</sub>O<sub>12</sub>(OH) join was studied by single-crystal X-ray diffraction to understand better the distribution of Sc<sup>3+</sup> among the octahedral sites, M1-M3, and its effect on the structure of epidote-group minerals. Oxide starting materials of Ca<sub>2</sub>Al<sub>2</sub>(Al<sub>1-<i>p</i></sub>)Sc<sub><i>p</i></sub>Si<sub>3</sub>O<sub>12.5</sub> composition with <i>p</i> = 0.5 and 1.0 were employed, and clinozoisite was successfully synthesized at <i>P</i><sub>H2O</sub> = 1.2–1.5 GPa and <i>T</i> = 700–800 °C. The Sc content in clinozoisite varies and attains 0.61 atoms per formula unit (apfu) from <i>p</i> = 1.0 starting material. Two Sc-bearing clinozoisite crystals from the product of <i>p</i> = 0.5 starting material (Run 20) were used for X-ray crystal structural analysis. The unit-cell parameters are <i>a</i> = 8.8815(4), <i>b</i> = 5.6095(2), <i>c</i> = 10.1466(5) Å, β = 115.318(6)º, and <i>V</i> = 457.0(1) Å<sup>3</sup> for 20B, and <i>a</i> = 8.885(1), <i>b</i> = 5.6119(4), <i>c</i> = 10.153(1) Å, β = 115.27(2)º, and <i>V</i> = 457.9(4) Å<sup>3</sup> for 20D. The resulting Sc<sup>3+</sup> occupancies among the octahedral sites are <sup>M1</sup>Al<sub>1.0</sub><sup>M2</sup>Al<sub>1.0</sub><sup>M3</sup>(Al<sub>0.684(7)</sub>Sc<sup>3+</sup><sub>0.316</sub>) for the former and <sup>M1</sup>Al<sub>1.0</sub><sup>M2</sup>Al<sub>1.0</sub><sup>M3</sup>(Al<sub>0.629(6)</sub>Sc<sup>3+</sup><sub>0.371</sub>) for the latter, i.e., Sc<sup>3+</sup> exclusively occupies M3. The mean ionic distance of &lt; M3–O &gt; 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 Ca<sub>2</sub>(Al, <i>Me</i><sup>3+</sup>)<sub>3</sub>Si<sub>3</sub>O<sub>12</sub>(OH) clinozoisite. It is due to the reduced distortion of M3O<sub>6</sub> octahedra caused by the short M3–O1 and M3–O8 distances. Although the angular variance ends up at a similar value to the Al-Fe<sup>3+</sup> epidote, the variation of ∠O<i>i</i>–M3-O<i>i</i> angles is different. The Sc-bearing clinozoisite has greater ∠O1–M3–O1’, but smaller ∠O2–M3–O2’ and ∠O2–M3–O4 relative to Al-Fe<sup>3+</sup> 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<sup>−1</sup> are assigned to the local configuration O10–H···O4–(<sup>M1</sup>Al<sup>M1</sup>Al<sup>M3</sup>Sc<sup>3+</sup>) and O10–H···O4–(<sup>M1</sup>Al<sup>M1</sup>Al<sup>M3</sup>Al), and O10–H···O2, respectively.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":"51 2","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00269-024-01280-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identification of rare earth elements in synthetic and natural monazite and xenotime by visible-to-shortwave infrared reflectance spectroscopy 利用可见光-短波红外反射光谱鉴定合成和天然独居石和氙中的稀土元素
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-05-03 DOI: 10.1007/s00269-024-01284-7
A. H. Dijkstra, W. H. Bakker, F. Deon, C. Marcatelli, M. P. Plokker, H. T. Hintzen

To support the role of proximal and remote sensing in geological rare earth element (REE) resource exploration, we studied the reflectance spectroscopy of synthetic single- and mixed-REE phosphate phases. Synthesis yielded monazite for the elements La to Gd, and xenotime for Dy to Lu and Y. Visible-to-shortwave infrared (350–2500 nm) reflectance spectra of synthetic single-REE monazites and xenotimes can be used to identify the ions responsible for the absorption features in natural monazites and xenotimes. Nd3+, Pr3+ and Sm3+ produce the main absorption features in monazites. In natural xenotime, Dy3+, Er3+, Ho3+ and Tb3+ ions cause the prevalent absorptions. The majority of the REE-related absorption features are due to photons exciting electrons within the 4f subshell of the trivalent lanthanide ions to elevated energy levels resulting from spin-orbit coupling. There are small (< 20 nm) shifts in the wavelengths of these absorptions depending on the nature of the ligands. The energy levels are further split by crystal field effects, manifested in the reflectance spectra as closely spaced (∼ 5–20 nm) multiplets within the larger absorption features. Superimposed on the electronic absorptions are vibrational absorptions in the H2O molecule or within [OH], [CO3]2− and [PO4]3− functional groups, but so far only the carbonate-related spectral features seem usable as a diagnostic tool in REE-bearing minerals. Altogether, our study creates a strengthened knowledge base for detection of REE using reflectance spectroscopy and provides a starting point for the identification of REE and their host minerals in mineral resources by means of hyperspectral methods.

为了支持近距离和遥感技术在稀土元素(REE)资源地质勘探中的作用,我们研究了合成的单一和混合稀土元素磷酸盐相的反射光谱。合成单稀土元素独居石和混合稀土元素独居石的可见光至短波红外(350-2500 nm)反射光谱可用于识别天然独居石和混合稀土元素独居石中产生吸收特征的离子。Nd3+、Pr3+ 和 Sm3+ 在独居石中产生主要的吸收特征。在天然氙石中,Dy3+、Er3+、Ho3+ 和 Tb3+ 离子导致了普遍的吸收。大多数与 REE 相关的吸收特征都是由于光子激发了三价镧系离子 4f 子壳内的电子,使其在自旋轨道耦合作用下达到较高的能级。根据配体的性质,这些吸收的波长会有微小(20 nm)的偏移。能级在晶体场效应的作用下进一步分裂,在反射光谱中表现为较大吸收特征中间隔较近(∼ 5-20 nm)的多重。与电子吸收叠加的是 H2O 分子或 [OH]-、[CO3]2- 和 [PO4]3- 官能团中的振动吸收,但到目前为止,似乎只有与碳酸盐相关的光谱特征可用作含 REE 矿物的诊断工具。总之,我们的研究为利用反射光谱检测 REE 奠定了坚实的知识基础,并为利用高光谱方法识别矿物资源中的 REE 及其寄主矿物提供了一个起点。
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引用次数: 0
In situ X-ray and IR probes relevant to Earth science at the Advanced Light Source at Lawrence Berkeley Laboratory 劳伦斯伯克利实验室先进光源与地球科学有关的原位 X 射线和红外探测器
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-28 DOI: 10.1007/s00269-024-01278-5
Martin Kunz, Katherine Armstrong, Harold Barnard, Hans A. Bechtel, Samantha C. Couper, Bora Kalkan, Harry Lisabeth, Alastair A. MacDowell, Lowell Miyagi, Dilworth Y. Parkinson, Nobumichi Tamura, Quentin Williams

Access to synchrotron X-ray facilities has become an important aspect for many disciplines in experimental Earth science. This is especially important for studies that rely on probing samples in situ under natural conditions different from the ones found at the surface of the Earth. The non-ambient condition Earth science program at the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, offers a variety of tools utilizing the infra-red and hard X-ray spectrum that allow Earth scientists to probe Earth and environmental materials at variable conditions of pressure, stress, temperature, atmospheric composition, and humidity. These facilities are important tools for the user community in that they offer not only considerable capacity (non-ambient condition diffraction) but also complementary (IR spectroscopy, microtomography), and in some cases unique (Laue microdiffraction) instruments. The availability of the ALS’ in situ probes to the Earth science community grows especially critical during the ongoing dark time of the Advanced Photon Source in Chicago, which massively reduces available in situ synchrotron user time in North America.

使用同步辐射 X 射线设施已成为地球科学实验中许多学科的一个重要方面。这对于那些依赖于在不同于地球表面的自然条件下就地探测样本的研究尤为重要。劳伦斯伯克利国家实验室先进光源(ALS)的非环境条件地球科学计划提供了各种利用红外和硬 X 射线光谱的工具,使地球科学家能够在压力、应力、温度、大气成分和湿度等不同条件下探测地球和环境材料。这些设施对用户群体来说是重要的工具,因为它们不仅提供了相当大的能力(非环境条件衍射),而且还提供了互补性(红外光谱学、微层析成像),在某些情况下还提供了独特的(Laue 微衍射)仪器。在芝加哥高级光子源的黑暗期,北美同步加速器用户的现场使用时间大为减少,因此向地球科学界提供 ALS 的现场探测器就变得尤为重要。
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引用次数: 0
Nefedovite, Na5Ca4(PO4)4F: thermal evolution, phase transition and crystal structure refinement Nefedovite、Na5Ca4(PO4)4F:热演化、相变和晶体结构完善
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-22 DOI: 10.1007/s00269-024-01276-7
Margarita S. Avdontceva, Andrey P. Shablinskii, Maria G. Krzhizhanovskaya, Sergey V. Krivovichev, Andrey A. Zolotarev, Vladimir N. Bocharov, Natalia S. Vlasenko, Evgenia Yu. Avdontseva, Victor N. Yakovenchuk

Nefedovite, Na5Ca4(PO4)4F, has been investigated by in situ high-temperature powder (30–690 °C) and single crystal (27–827 °C) X-ray diffraction and Raman spectroscopy. Nefedovite is tetragonal, space group I-4, a = 11.6560(2), c = 5.4062(2) Å, V = 734.50(2) Å3 (R1 = 0.0149). Nefedovite is a 1D antiperovskite, since its crystal structure contains chains of corner-sharing anion-centered [FCa4Na2]9+ octahedra. The chains are parallel to the c direction. Nefedovite is stable up to 727 °C and undergoes a displacive phase transition in the temperature range 277–327 °C. With increasing temperature, the PO4 tetrahedra in the crystal structure of nefedovite gradually rotate around the imaginary fourfold inversion axes aligning the O2O3 edge parallel to [110], which ultimately leads to the appearance of the mirror plane perpendicular to the c direction and the change of space group from I-4 (82) to I4/m (87). The crystal structure of nefedovite expands strongly anisotropically with the direction of the maximum thermal expansion oriented perpendicular to the chains of anion-centered octahedra. The information-based structural complexity analysis demonstrates that both low- and high-temperature modifications of nefedovite are structurally simple with the IG,total value less than 100 bits per unit cell. The structural complexity decreases along the phase transition, which is typical for displacive phase transitions.

通过原位高温粉末(30-690 °C)和单晶(27-827 °C)X 射线衍射和拉曼光谱,对 Nefedovite(Na5Ca4(PO4)4F)进行了研究。Nefedovite 为四方晶,空间群 I-4,a = 11.6560(2),c = 5.4062(2) Å,V = 734.50(2) Å3 (R1 = 0.0149)。Nefedovite 是一种一维反沸石,因为它的晶体结构包含以阴离子为中心的[FCa4Na2]9+八面体共角链。这些链平行于 c 方向。内闪石在 727 ℃ 以下稳定,在 277-327 ℃ 温度范围内发生置换相变。随着温度的升高,nefedovite 晶体结构中的 PO4 四面体逐渐围绕假想的四倍反转轴旋转,使 O2...O3 边沿平行于[110],最终导致出现垂直于 c 方向的镜面,空间群从 I-4(82)变为 I4/m(87)。霞石的晶体结构具有强烈的各向异性膨胀,最大热膨胀方向垂直于阴离子中心八面体链。基于信息的结构复杂性分析表明,霞石的低温和高温变质结构都很简单,每个单位晶胞的 IG 总值小于 100 位。结构复杂性随着相变而降低,这是典型的置换相变。
{"title":"Nefedovite, Na5Ca4(PO4)4F: thermal evolution, phase transition and crystal structure refinement","authors":"Margarita S. Avdontceva,&nbsp;Andrey P. Shablinskii,&nbsp;Maria G. Krzhizhanovskaya,&nbsp;Sergey V. Krivovichev,&nbsp;Andrey A. Zolotarev,&nbsp;Vladimir N. Bocharov,&nbsp;Natalia S. Vlasenko,&nbsp;Evgenia Yu. Avdontseva,&nbsp;Victor N. Yakovenchuk","doi":"10.1007/s00269-024-01276-7","DOIUrl":"10.1007/s00269-024-01276-7","url":null,"abstract":"<div><p>Nefedovite, Na<sub>5</sub>Ca<sub>4</sub>(PO<sub>4</sub>)<sub>4</sub>F, has been investigated by in situ high-temperature powder (30–690 °C) and single crystal (27–827 °C) X-ray diffraction and Raman spectroscopy. Nefedovite is tetragonal, space group <i>I</i>-4, <i>a</i> = 11.6560(2), <i>c</i> = 5.4062(2) Å, <i>V</i> = 734.50(2) Å<sup>3</sup> (<i>R</i><sub><i>1</i></sub> = 0.0149). Nefedovite is a 1<i>D</i> antiperovskite, since its crystal structure contains chains of corner-sharing anion-centered [FCa<sub>4</sub>Na<sub>2</sub>]<sup>9+</sup> octahedra. The chains are parallel to the <i>c</i> direction. Nefedovite is stable up to 727 °C and undergoes a displacive phase transition in the temperature range 277–327 <i>°</i>C. With increasing temperature, the PO<sub>4</sub> tetrahedra in the crystal structure of nefedovite gradually rotate around the imaginary fourfold inversion axes aligning the O2<sup>…</sup>O3 edge parallel to [110], which ultimately leads to the appearance of the mirror plane perpendicular to the <i>c</i> direction and the change of space group from <i>I</i>-4 (82) to <i>I</i>4/<i>m</i> (87). The crystal structure of nefedovite expands strongly anisotropically with the direction of the maximum thermal expansion oriented perpendicular to the chains of anion-centered octahedra. The information-based structural complexity analysis demonstrates that both low- and high-temperature modifications of nefedovite are structurally simple with the <i>I</i><sub>G,total</sub> value less than 100 bits per unit cell. The structural complexity decreases along the phase transition, which is typical for displacive phase transitions.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":"51 2","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140675296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal evolution of metamict davidite-(La) from the Radium Hill, Australia: recrystallization and thermal expansion 澳大利亚镭山的偏闪闪长石(La)的热演化:再结晶和热膨胀
IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-22 DOI: 10.1007/s00269-024-01274-9
Ruiqi Chen, Oleg I. Siidra, Valery L. Ugolkov, Vera A. Firsova, Natalia S. Vlasenko, Angel M. Arevalo-Lopez, Marie Colmont, Vladimir N. Bocharov

Aside from its economic value, davidite and its synthetic analogs may have potential applications in materials science. The unique properties of the crichtonite group minerals, including davidite-(La), make them attractive candidates for high-level waste (HLW) immobilization. We studied the thermal evolution of the metamict davidite-(La) from the Radium Hill, Australia. The investigation of the temperature-induced crystallization process was conducted, and the thermal expansion coefficients (TEC) for the recrystallized davidite (RD) were determined for the first time. Our results demonstrate that RD has relatively low TEC indicating its thermophysical stability. The following TECs of davidite- (La) for the temperature range 25–1200 °C were obtained: (overline{mathrm{alpha }}) a = (overline{mathrm{alpha }}) b = 9.96 (3) × 10–6 ºC−1; (overline{mathrm{alpha }}) c = 10.79 (4) × 10–6 ºC−1. The character of the thermal expansion is in agreement with the structure characterized by layers stacked along the c axis. The volume TEC αV = 24.81 (47)—36.80 (48) × 10–6 ºC−1. Davidite-(La) exhibits an almost isotropic thermal expansion and shows one of the most superior thermal performances in comparison to the other mineral-like phases utilized for the immobilization of HLW.

除了经济价值之外,大维石及其合成类似物在材料科学领域也有潜在的应用价值。包括大菱锰矿(La)在内的菱锰矿类矿物的独特性质使其成为具有吸引力的高放射性废物(HLW)固定化候选矿物。我们研究了澳大利亚镭山的变质大理石(La)的热演化过程。我们对温度诱导的结晶过程进行了研究,并首次测定了重结晶大理石(RD)的热膨胀系数(TEC)。我们的结果表明,RD 的热膨胀系数相对较低,这表明它具有热物理稳定性。在25-1200 °C的温度范围内,我们得到了大维石(La)的下列TEC:(overline{mathrm{alpha }}) a = (overline{mathrm{alpha }}) b = 9.96 (3) × 10-6 ºC-1; (overline{mathrm{alpha }}) c = 10.79 (4) × 10-6 ºC-1。热膨胀的特征与沿 c 轴层层堆叠的结构特征一致。体积 TEC αV = 24.81 (47)-36.80 (48) × 10-6 ºC-1。与其他用于固定 HLW 的类矿物相相比,戴维石(La)表现出几乎各向同性的热膨胀,并显示出最优越的热性能。
{"title":"Thermal evolution of metamict davidite-(La) from the Radium Hill, Australia: recrystallization and thermal expansion","authors":"Ruiqi Chen,&nbsp;Oleg I. Siidra,&nbsp;Valery L. Ugolkov,&nbsp;Vera A. Firsova,&nbsp;Natalia S. Vlasenko,&nbsp;Angel M. Arevalo-Lopez,&nbsp;Marie Colmont,&nbsp;Vladimir N. Bocharov","doi":"10.1007/s00269-024-01274-9","DOIUrl":"10.1007/s00269-024-01274-9","url":null,"abstract":"<div><p>Aside from its economic value, davidite and its synthetic analogs may have potential applications in materials science. The unique properties of the crichtonite group minerals, including davidite-(La), make them attractive candidates for high-level waste (HLW) immobilization. We studied the thermal evolution of the metamict davidite-(La) from the Radium Hill, Australia. The investigation of the temperature-induced crystallization process was conducted, and the thermal expansion coefficients (TEC) for the recrystallized davidite (RD) were determined for the first time. Our results demonstrate that RD has relatively low TEC indicating its thermophysical stability. The following TECs of davidite- (La) for the temperature range 25–1200 °C were obtained: <span>(overline{mathrm{alpha }})</span> <sub><i>a</i></sub> = <span>(overline{mathrm{alpha }})</span> <sub><i>b</i></sub> = 9.96 (3) × 10<sup>–6</sup> ºC<sup>−1</sup>; <span>(overline{mathrm{alpha }})</span> <sub><i>c</i></sub> = 10.79 (4) × 10<sup>–6</sup> ºC<sup>−1</sup>. The character of the thermal expansion is in agreement with the structure characterized by layers stacked along the <i>c</i> axis. The volume TEC α<sub><i>V</i></sub> = 24.81 (47)—36.80 (48) × 10<sup>–6</sup> ºC<sup>−1</sup>. Davidite-(La) exhibits an almost isotropic thermal expansion and shows one of the most superior thermal performances in comparison to the other mineral-like phases utilized for the immobilization of HLW.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":"51 2","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140676115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Physics and Chemistry of Minerals
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