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Thermal treatment of the tourmaline Fe-rich princivalleite Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O 电气石富铁princivalleite Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O的热处理
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-09 DOI: 10.1007/s00269-023-01250-9
Alessandra Altieri, Riccardo Luppi, H. Skogby, U. Hålenius, G. Tempesta, Federico Pezzotta, F. Bosi
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引用次数: 0
Development of the crystallinity model and investigation of the effective factors on the crystallinity of zeolite Y using the response surface method 响应面法建立Y分子筛结晶度模型及影响结晶度因素的研究
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-01 DOI: 10.1007/s00269-023-01251-8
Mohammad Reza Ranjbar Toroghi, Mehdi Panahi, Mehdi Karimi, Ali Nakhaeipour, Ali Mohammadi

In this study, zeolite Y was synthesized from sodium silicate, aluminum hydroxide, sodium hydroxide and distilled water under hydrothermal method. The Box–Behnken design was used as a response surface method considering seven factors affecting the crystallization of zeolite to determine the number of experiments. The linear, square and interaction effects of the factors were investigated. The factors consist of four factors for the gel composition, including the molar value of Si, Al, Na and H2O and three factors for the synthesis conditions, including aging time, crystallization time and temperature. The XRD patterns of the synthesized samples were compared with the XRD pattern of standard zeolite Y. Among the samples, sample 50 with the highest intensity and maximum total area of 14 peaks, was selected as the reference sample and it was used to determine the relative crystallinity percentage of the remaining samples. Based on the results of the experiments, it was concluded that changes in the gel composition have a more significant effect on the response in comparison with changes in the synthesis conditions. In addition, optimization of the obtained model was carried out and a zeolite with higher relative crystallinity than the standard zeolite Y was synthesized. At the optimal point, zeolite Y was synthesized with a relative crystallinity of 117.5%. The composition of the gel was 0.59 SiO2: 0.0563 Al2O3: 0.4266 Na2O: 12.376 H2O. The total synthesis time was 30 h.

以水玻璃、氢氧化铝、氢氧化钠和蒸馏水为原料,水热法制备Y型沸石。采用Box-Behnken设计作为响应面法,考虑影响沸石结晶的7个因素,确定实验次数。考察了各因素的线性效应、平方效应和交互效应。影响凝胶组成的因素包括硅、铝、钠和水的摩尔值4个因素和合成条件的因素包括时效时间、结晶时间和温度3个因素。将合成样品的XRD谱图与标准沸石y的XRD谱图进行比较。其中选取强度最高、总面积最大的14峰50号样品作为参比样品,测定剩余样品的相对结晶度。实验结果表明,凝胶组成的变化对反应的影响比合成条件的变化更为显著。并对所得模型进行了优化,合成了一种相对结晶度高于标准Y型沸石的分子筛。在最佳点合成Y型沸石,相对结晶度为117.5%。凝胶的组成为0.59 SiO2: 0.0563 Al2O3: 0.4266 Na2O: 12.376 H2O。总合成时间为30 h。
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引用次数: 0
2M1 phlogopite–muscovite series minerals at increasing pressure to 9 GPa. I Atomic volumes and compressibilities 2M1辉云母-白云母系列矿物,加压至9gpa。原子体积和可压缩性
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-08-05 DOI: 10.1007/s00269-023-01248-3
Alfonso Hernández-Laguna, Isaac Vidal-Daza, Antonio Sánchez-Navas, Claro Ignacio Sainz-Díaz

Muscovite (Ms) and phlogopite (Phl) series mineral is studied in the 2M1 polytype and modeled by the substitution of three Mg2+ cations in the three octahedral sites of Phl [KMg3(Si3Al)O10(OH)2] by two Al3+ and one vacancy, increasing the substitution up to reach the Ms [KAl2□(Si3Al)O10(OH)2]. The series was computationally examined at DFT using Quantum ESPRESSO, as a function of pressure from − 3 to 9 GPa. Crystal structure is calculated, and cell parameters, and geometry of atomic groups agree with experimental values. OH in the Mg2+ octahedrons are approximately perpendicular to the (001) plane, meanwhile when they are in Al3+, octahedral groups are approximately parallel to this plane. From Quantum Theory of Atoms in Molecules, the atomic basins are calculated as a function of the pressure, K+ and basal O show the largest volumes. The bulk excess volume (Vxs) and the excess atomic volumes are analyzed as a function of the composition and the pressure. K+, basal and apical O Vxs show a behavior similar to the bulk Vxs as a function of the composition, keeping qualitatively this behavior as a function of pressure; substituent atoms do not show a Vxs behavior similar to the bulk and their effect consequently is mostly translated to atoms in the interlayer space. Atomic compressibilities are also calculated. Atomic compressibilities are separated in the different sheets of the crystal cell. Atomic moduli of K and basal O are the lowest and the ones behaving as the bulk modulus of the series. The atomic bulk modulus of the H’s is different depending of their position with respect to the (001) plane.

在2M1多型中研究了白云母(Ms)和绿云母(Phl)系列矿物,并通过在Phl [KMg3(Si3Al)O10(OH)2]的三个八面体位置上用两个Al3+和一个空位取代三个Mg2+阳离子来模拟,从而增加取代量,达到Ms [KAl2□(Si3Al)O10(OH)2]。使用Quantum ESPRESSO在DFT下对该系列进行了计算检验,作为压力从- 3到9 GPa的函数。计算了晶体结构,胞体参数和原子群的几何形状与实验值一致。Mg2+八面体中的OH近似垂直于(001)平面,而Al3+八面体中的OH近似平行于(001)平面。根据分子中原子的量子理论,原子盆作为压力的函数计算,K+和基氧显示出最大的体积。分析了超体积(vx)和超原子体积作为组分和压力的函数。K+、基底和根尖的ovxs表现出与体Vxs相似的行为,作为组分的函数,定性地保持了这种行为作为压力的函数;取代原子不表现出类似体的vx行为,因此它们的作用主要转化为层间空间的原子。还计算了原子的可压缩性。原子可压缩性在晶体单元的不同薄片中被分离。K和基氧的原子模量是最低的,表现为该系列的体积模量。H的原子体积模量是不同的,这取决于它们相对于(001)平面的位置。
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引用次数: 0
Thermodynamics of schafarzikite (FeSb2O(_4)) and tripuhyite (FeSbO(_4)) Phrasic(FeSb2O_4)和Triuhite(FeSbO_4)的热力学
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-08-05 DOI: 10.1007/s00269-023-01249-2
Juraj Majzlan, Marek Tuhý, Edgar Dachs, Artur Benisek

In this work, we investigated the thermodynamic properties of synthetic schafarzikite (FeSb2O(_4)) and tripuhyite (FeSbO(_4)). Low-temperature heat capacity ((C_p)) was determined by relaxation calorimetry. From these data, third-law entropy was calculated as (110.7pm 1.3) J mol(^{-1})K(^{-1}) for tripuhyite and (187.1pm 2.2) J mol(^{-1}) K(^{-1}) for schafarzikite. Using previously published (Delta _fG^o) values for both phases, we calculated their (Delta _fH^o) as (-947.8pm 2.2) for tripuhyite and (-1061.2pm 4.4) for schafarzikite. The accuracy of the data sets was tested by entropy estimates and calculation of (Delta _fH^o) from estimated lattice energies (via Kapustinskii equation). Measurements of (C_p) above (T = 300) K were augmented by extrapolation to (T = 700) K with the frequencies of acoustic and optic modes, using the Kieffer (C_p) model. A set of equilibrium constants ((log K)) for tripuhyite, schafarzikite, and several related phases was calculated and presented in a format that can be employed in commonly used geochemical codes. Calculations suggest that tripuhyite has a stability field that extends over a wide range of pH-p(epsilon) conditions at (T = 298.15) K. Schafarzikite and hydrothermal oxides of antimony (valentinite, kermesite, and senarmontite) can form by oxidative dissolution and remobilization of pre-existing stibnite ores.

本文研究了合成的沙法芝石(FeSb2O (_4))和三辉石(FeSbO (_4))的热力学性质。低温热容((C_p))由松弛量热法测定。根据这些数据,计算出第三定律熵分别为(110.7pm 1.3) J mol (^{-1}) K (^{-1}) (tripuhyite)和(187.1pm 2.2) J mol (^{-1}) K (^{-1}) (schafarzikite)。利用之前公布的两个相的(Delta _fG^o)值,我们计算出它们的(Delta _fH^o)为:tripuhyite为(-947.8pm 2.2), schafarzikite为(-1061.2pm 4.4)。数据集的准确性通过熵估计和从估计的晶格能量(通过kapusstinskii方程)计算(Delta _fH^o)来测试。使用Kieffer (C_p)模型,将声波和光学模式的频率外推到(T = 700) K,从而增加了(T = 300) K以上的(C_p)测量值。本文计算了三辉石、沙法子石和若干相关相的平衡常数((log K)),并以一种可用于常用地球化学代码的格式给出。计算表明,在(T = 298.15) K. Schafarzikite和水热锑氧化物(valentinite、kermesite和senarmonite)可以通过氧化溶解和原有辉锑矿的再活化形成,在pH-p (epsilon)条件下具有广泛的稳定场。
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引用次数: 0
Post-spinel transition of Fe2SiO4 ahrensite at high pressure and high temperature 高压高温下Fe2SiO4阿伦体的尖晶石后转变
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-14 DOI: 10.1007/s00269-023-01247-4
Masaki Akaogi, Natsuki Miyazaki, Taisuke Tajima, Hiroshi Kojitani

Phase relations for dissociation of spinel-structured Fe2SiO4 ahrensite to FeO wüstite + SiO2 stishovite have been determined up to 20 GPa and 1400 °C under the iron-wüstite buffer conditions by multianvil high-pressure and high-temperature experiments. The dissociation boundary determined is expressed by P (GPa) = 19.6 (± 1.0) – 3.0 (± 0.8) × 10−3 T (°C). The boundary with the negative dP/dT slope is placed by ~ 1–4 GPa at lower pressure at 1000–1200 °C than the previously determined boundaries whose slopes ranged from strongly positive to weakly negative. Thermodynamic calculation based on available thermodynamic data of ahrensite, wüstite and stishovite has provided the dissociation boundary which is in good agreement within the errors with that experimentally determined in this study. By combining the post-spinel phase relations in Fe2SiO4 determined in this study with available phase relations in the Fe2SiO4-Mg2SiO4 system, it is suggested that natural Fe2SiO4-rich ahrensite crystals found in the shocked Umbarger L6 chondrite crystallized in shock-induced melt pockets of the FeO- and SiO2-rich composition at pressures below ~ 13–16 GPa and above ~ 9–12 GPa in the shock process.

通过多砧高压和高温实验,确定了尖晶石结构的Fe2SiO4铁榴石在铁- w榴石缓冲条件下,在20gpa和1400℃下解离为FeO w榴石+ SiO2硅榴石的相关系。解离边界用P (GPa) = 19.6(±1.0)- 3.0(±0.8)× 10−3 T(°C)表示。dP/dT斜率为负的边界在1000-1200°C的压力下放置在~ 1-4 GPa,比先前确定的斜率从强正到弱负的边界低。根据现有的阿伦石、钨辉石和辉石的热力学数据进行热力学计算,得到的解离边界与本研究中实验确定的解离边界在误差范围内符合得很好。结合本研究确定的Fe2SiO4中尖晶石后的相关系和Fe2SiO4- mg2sio4体系中可用的相关系,表明在Umbarger L6球粒陨石中发现的天然富Fe2SiO4阿氏体晶体在冲击过程中,在低于~ 13-16 GPa和高于~ 9-12 GPa的压力下,在富FeO和富sio2成分的冲击诱导熔袋中结晶。
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引用次数: 0
Elasticity of natural aragonite samples by Brillouin spectroscopy 用布里渊光谱分析天然文石样品的弹性
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-12 DOI: 10.1007/s00269-023-01244-7
Lea Pennacchioni, Sergio Speziale, Björn Winkler

The single-crystal elastic moduli of three natural aragonites, CaCO3, have been determined at ambient conditions by Brillouin spectroscopy. The samples contain different amounts of Sr ranging from 0.1 mol% to 1.5 mol% and cover the majority of the compositional range of natural aragonites. Brillouin spectroscopy can resolve changes in elasticity produced by small differences in the Sr content in aragonite, however, these changes are at the limit of the resolving power of our measurements. Our results are in good agreement with the full tensor of a Sr-bearing natural aragonite determined by Brillouin spectroscopy and with the tensor obtained by DFT calculations. The decrease we measured of the aggregate adiabatic bulk modulus, (K_S), with increasing Sr content is qualitatively in good agreement with the softening observed in previously measured isothermal bulk modulus, (K_T), of synthetic CaCO3-SrCO3 solid solutions and with the value of (K_S) determined for SrCO3. Our study provides the first full tensor on nominally pure (end-member) aragonite and places contraints on its dependence on Ca/Sr substitutions at levels observed in natural samples. Furthermore, we compare the elastic tensor of aragonite and calcite, the two main CaCO3 polymorphs observed at ambient conditions, and describe their differences based on the arrangement of the polyhedral structural units of the two polymorphs. In particular, the different arrangement of the Ca-O polyhedra leads to a smaller compressibility of aragonite along the c-axis, higher compressibilities along the a- and b-axes and an overall lower bulk modulus ((-)9.7%) with respect to that of the less dense calcite.

用布里渊光谱法测定了三种天然文石CaCO3的单晶弹性模量。样品中含有不同量的锶,从0.1 mol% to 1.5 mol% and cover the majority of the compositional range of natural aragonites. Brillouin spectroscopy can resolve changes in elasticity produced by small differences in the Sr content in aragonite, however, these changes are at the limit of the resolving power of our measurements. Our results are in good agreement with the full tensor of a Sr-bearing natural aragonite determined by Brillouin spectroscopy and with the tensor obtained by DFT calculations. The decrease we measured of the aggregate adiabatic bulk modulus, (K_S), with increasing Sr content is qualitatively in good agreement with the softening observed in previously measured isothermal bulk modulus, (K_T), of synthetic CaCO3-SrCO3 solid solutions and with the value of (K_S) determined for SrCO3. Our study provides the first full tensor on nominally pure (end-member) aragonite and places contraints on its dependence on Ca/Sr substitutions at levels observed in natural samples. Furthermore, we compare the elastic tensor of aragonite and calcite, the two main CaCO3 polymorphs observed at ambient conditions, and describe their differences based on the arrangement of the polyhedral structural units of the two polymorphs. In particular, the different arrangement of the Ca-O polyhedra leads to a smaller compressibility of aragonite along the c-axis, higher compressibilities along the a- and b-axes and an overall lower bulk modulus ((-)9.7%) with respect to that of the less dense calcite.
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引用次数: 1
High-temperature behavior of quartz-in-garnet system revealed by in situ Raman spectroscopy 用原位拉曼光谱研究石英-石榴石体系的高温行为
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-07 DOI: 10.1007/s00269-023-01246-5
Marta Morana, Ross J. Angel, Matteo Alvaro, Boriana Mihailova

Quartz is one of the most abundant minerals in the Earth crust and therefore quartz inclusions in garnet are of great interest for elastic geobarometry, an approach that exploits the elastic properties of the mineral pair to back-calculate the conditions of inclusion entrapment. However, the high-temperature behavior of quartz inclusions close to the (alpha)(beta) transition boundary has not been studied experimentally. We have therefore performed in situ high-temperature Raman spectroscopy on a quartz-in-garnet system up to 1000 K, and have also collected an improved reference data set for the temperature dependence of the Raman scattering of free quartz. Our results show that the (alpha)-to-(beta) phase transition is hindered by the stress imposed by the host on the quartz inclusion, resulting in a thermosalient effect of the whole host-inclusion system or a mechanical cracking of the host mineral.

石英是地壳中最丰富的矿物之一,因此石榴石中的石英包裹体对弹性地压测量有很大的兴趣,这种方法利用矿物对的弹性特性来反计算包裹体的包裹条件。然而,石英包裹体在(alpha) - (beta)过渡边界附近的高温行为尚未进行实验研究。因此,我们在高达1000 K的石榴石中石英系统上进行了原位高温拉曼光谱,并收集了自由石英拉曼散射温度依赖性的改进参考数据集。我们的研究结果表明,(alpha) - (beta)的相变受到寄主对石英包裹体施加的应力的阻碍,导致整个寄主-包裹体系统的热效应或寄主矿物的机械开裂。
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引用次数: 0
Single crystals of phenakite-like Be2(Si1−xGex)O4 solid solution: novel experimental data on hydrothermal crystal growth, X-ray diffraction and Raman spectroscopy study 类phenakite Be2(Si1−xGex)O4固溶体的单晶:水热晶体生长、x射线衍射和拉曼光谱研究的新实验数据
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-03 DOI: 10.1007/s00269-023-01245-6
Valentin Kovalev, Victor Thomas, Tatiana Setkova, Natalia Zubkova, Anna Spivak, Dmitry Fursenko, Vasiliy Yapaskurt, Alexander Antipin, Elena Borovikova

The pioneering hydrothermal synthesis of the compound Be2[(Si1−xGex)O4] with a phenakite structure (the size of individual crystals up to 1 mm) was carried out in acidic alkaline-containing fluoride solutions at a temperature of 625 °C and a pressure of ~ 150 MPa. Uniform (x = 0, 0.80 and 1) and zonal (x = 0.04 − 0.025) Be2[(Si1−xGex)O4] crystals synthesized in the Li-containing mineralizer were obtained. The possibility of formation of intermediate compounds under hydrothermal conditions remains an open question. In the Na-containing mineralizer, only Be2SiO4 crystallizes due to the formation of insoluble sodium germanates. The fading of formation of Be2[(Si1−xGex)O4] was determined with the use of technique of temperature-induced zoning and can be explained by the fact that newly formed crystals screen the surface of the initial BeO. The instantaneous growth rates of the prismatic faces of Ge-substituted phenakite crystals, decreasing from 18 microns/day to 2, were determined using the technique of temperature-induced zonality. The crystal structures of Be2[(Si1−xGex)O4] samples with x = 0, 0.80 and 1 were refined by direct X-ray diffraction methods, and the linear dependence of the unit cell parameters and bond lengths on the germanium content has been quantitively described. First Raman spectroscopy study of Be2[(Si1−xGex)O4] on zonal crystals indicated the linear shift of vibration bands in Raman spectra to a lower frequencies with an increase in germanium concentration (x up to 0.25). A new Raman band of Ge–O stretching vibrations at ~ 1115 cm−1, which is not common for natural and synthetic germanium-free phenakites, was observed.

在含酸碱性氟化物溶液中,在625°C的温度和~ 150 MPa的压力下,水热合成了具有phenakite结构(单个晶体尺寸可达1mm)的化合物Be2[(Si1−xGex)O4]。在含锂矿化剂中合成了均匀(x = 0,0.80和1)和带状(x = 0.04−0.025)Be2[(Si1−xGex)O4]晶体。在热液条件下形成中间化合物的可能性仍然是一个悬而未决的问题。在含钠矿化剂中,由于形成不溶的锗酸钠,只有Be2SiO4结晶。利用温度诱导区带技术测定了Be2[(Si1−xGex)O4]形成的衰落,这可以解释为新形成的晶体屏蔽了初始BeO的表面。利用温度诱导地带性技术,测定了锗取代苯钠矿晶体棱柱面的瞬时生长速率,从18 μ m /d下降到2 μ m /d。用直接x射线衍射方法对x = 0、0.80和1的Be2[(Si1−xGex)O4]样品的晶体结构进行了细化,定量描述了单晶参数和键长与锗含量的线性关系。对带状晶体上的Be2[(Si1−xGex)O4]进行的首次拉曼光谱研究表明,随着锗浓度的增加,拉曼光谱中的振动带向较低的频率线性移动(x达到0.25)。在~ 1115 cm−1处,发现了一个新的锗氧拉伸振动拉曼带,这在天然和合成无锗phenakites中并不常见。
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引用次数: 1
Sound velocity and elastic properties of Fe–Ni–S–Si liquid: the effects of pressure and multiple light elements Fe-Ni-S-Si液体声速和弹性性能:压力和多个轻元素的影响
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-01 DOI: 10.1007/s00269-023-01243-8
Iori Yamada, Hidenori Terasaki, Satoru Urakawa, Tadashi Kondo, Akihiko Machida, Yoshinori Tange, Yuji Higo

Fe–Ni–S–Si alloy is considered to be one of the plausible candidates of Mercury core material. Elastic properties of Fe–Ni–S–Si liquid are important to reveal the density profile of the Mercury core. In this study, we measured the P-wave velocity (VP) of Fe–Ni–S–Si (Fe73Ni10S10Si7, Fe72Ni10S5Si13, and Fe67Ni10S10Si13) liquids up to 17 GPa and 2000 K to study the effects of pressure, temperature, and multiple light elements (S and Si) on the VP and elastic properties.

The VP of Fe–Ni–S–Si liquids are less sensitive to temperature. The effect of pressure on the VP are close to that of liquid Fe and smaller than those of Fe–Ni–S and Fe–Ni–Si liquids. Obtained elastic properties are KS0 = 99.1(9.4) GPa, KS = 3.8(0.1) and ρ0 =6.48 g/cm3 for S-rich Fe73Ni10S10Si7 liquid and KS0 = 112.1(1.5) GPa, KS’ = 4.0(0.1) and ρ0=6.64 g/cm3 for Si-rich Fe72Ni10S5Si13 liquid. The VP of Fe–Ni–S–Si liquids locate in between those of Fe–Ni–S and Fe–Ni–Si liquids. This suggests that the effect of multiple light element (S and Si) on the VP is suppressed and cancel out the effects of single light elements (S and Si) on the VP. The effect of composition on the EOS in the Fe–Ni–S–Si system is indispensable to estimate the core composition combined with the geodesy data of upcoming Mercury mission.

Fe-Ni-S-Si合金被认为是可能的汞芯材料之一。Fe-Ni-S-Si液体的弹性特性对揭示水星核心的密度分布具有重要意义。在本研究中,我们测量了Fe-Ni-S-Si (Fe73Ni10S10Si7, Fe72Ni10S5Si13和Fe67Ni10S10Si13)液体在17gpa和2000k下的纵波速度(VP),以研究压力、温度和多种轻元素(S和Si)对VP和弹性性能的影响。Fe-Ni-S-Si液体的VP对温度不太敏感。压力对VP的影响接近于Fe液体,小于Fe - ni - s和Fe - ni - si液体。得到的弹性性能为富s Fe73Ni10S10Si7液体KS0 = 99.1(9.4) GPa, KS′= 3.8(0.1),ρ0= 6.48 g/cm3;富si Fe72Ni10S5Si13液体KS0 = 112.1(1.5) GPa, KS′= 4.0(0.1),ρ0=6.64 g/cm3。Fe-Ni-S - si液体的VP介于Fe-Ni-S和Fe-Ni-Si液体之间。这表明多光元素(S和Si)对VP的影响被抑制,抵消了单光元素(S和Si)对VP的影响。结合即将到来的水星任务的大地测量数据,估算核心成分对Fe-Ni-S-Si系统中EOS的影响是必不可少的。
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引用次数: 0
Hydrogen defects in feldspars: alkali-supported dehydrogenation of sanidine 长石中的氢缺陷:碱支撑的苯胺脱氢
IF 1.4 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-06-23 DOI: 10.1007/s00269-023-01242-9
Harald Behrens

In the first two papers of this series [Behrens, Phys Chem Minerals 48:8, 2021a; Behrens, Phys Chem Minerals 48:27, 2021b], incorporation of hydrogen in the feldspar structure, partitioning of hydrogen between feldspars and gases/fluids and self-diffusion of hydrogen in feldspars have been discussed, with particular focus on sanidine. Here, the results of reactions between sanidine containing strongly bonded hydrogen defects and (Na,K)Cl are presented. Experiments were performed at ambient pressure at temperatures of 605–1000 °C, and hydrogen profiles were measured by IR microspectroscopy. Profiles can be interpreted by an incomplete dehydrogenation at the crystal surface or a strong concentration dependence of hydrogen diffusivity. Both are consistent with hydrogen located on interstitial sites and difficult to substitute by the larger alkali ions. Chemical diffusivities of hydrogen derived from fitting of the profiles or Boltzmann–Matano analysis are similar to self-diffusivities determined by D/H exchange experiments. Activation energies are also comparable. Comparison to sodium and potassium diffusion data for sanidine (Wilangowski et al. in Defect Diffus Forum 363: 79–84, 2015; Hergemöller et al. in Phys Chem Minerals 44:345–351, 2017) supports a mechanism of proton diffusion charge-compensated by Na+ diffusion for hydrogen removal in the sanidines under dry conditions.

在本系列的前两篇论文中[Behrens,物理化学矿物48:8,2021a;Behrens,物理化学矿物48:27,2021 [b],讨论了氢在长石结构中的掺入,氢在长石与气体/流体之间的分配以及氢在长石中的自扩散,特别是氢在长石中的自扩散。本文介绍了含强键氢缺陷的苯胺与(Na,K)Cl的反应结果。实验在605-1000°C的环境压力下进行,并通过红外显微光谱测量氢谱。剖面可以通过晶体表面的不完全脱氢或氢扩散率的浓度依赖性来解释。两者都与位于间隙位置的氢相一致,难以被较大的碱离子取代。由玻尔兹曼-马塔诺分析得到的氢的化学扩散系数与由D/H交换实验确定的自扩散系数相似。活化能也是可以比较的。(Wilangowski et al.,缺陷扩散论坛363:79-84,2015;Hergemöller等人在物理化学矿物44:35 5 - 351,2017)支持质子扩散机制,由Na+扩散补偿,以在干燥条件下去除氢。
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Physics and Chemistry of Minerals
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