Physics and Chemistry of Minerals最新文献_第2页

Pressure–volume equation of state of Fe18Pt82 Fe18Pt82 的压力-体积状态方程

IF 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-07-20 DOI: 10.1007/s00269-024-01275-8

Meryem Berrada, Siheng Wang, Bin Chen, Vitali Prakapenka, Stella Chariton, Marc M. Hirschmann, Jie Li

{"title":"Pressure–volume equation of state of Fe18Pt82","authors":"Meryem Berrada, Siheng Wang, Bin Chen, Vitali Prakapenka, Stella Chariton, Marc M. Hirschmann, Jie Li","doi":"10.1007/s00269-024-01275-8","DOIUrl":"https://doi.org/10.1007/s00269-024-01275-8","url":null,"abstract":"Platinum-iron (Pt-Fe) alloys have long served as oxygen fugacity sensors in high-temperature experiments investigating Earth and planetary interiors, relying on the equilibrium between Fe within the alloy and FeO in coexisting oxides or silicates. Despite their significance, studies on intermediate compositions remain limited. This investigation focuses on compressibility of Fe18Pt82 up to (sim) 40 GPa at ambient temperature and explores the pressure-dependent characteristics of the oxygen fugacity relationship. In-situ X-ray diffraction measurements confirm the stability of the fcc phase in Fe18Pt82 across the pressure range. The fit to the compression data by the third-order Birch–Murnaghan equation of state results in ({V}_{0}=59.14 pm 0.08)Å3, ({K}_{0}=266 pm 13) GPa, and ({K}_{0}^{prime}=4.7 pm 0.7). The differences between this fit and the Vinet and Kunc equations of state fall within the range of uncertainty. Comparing results with reported data for other Pt-Fe alloys reveals a nearly linear trend between volume and the Fe content in Pt-Fe alloys at ambient pressure. Unlike more iron-rich alloys, the excess volume of mixing of Fe18Pt82 ((sim) 0.21 cm3/mol) remains nearly constant across the examined pressure range. Estimates of the excess Gibbs free energy suggest diminishing non-ideal contributions to thermodynamic activities as pressure increases.","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739898","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

Purification mechanism of microcrystalline graphite and dissolution of non-carbon impurity during alkali autoclave-acid leaching 碱高压釜-酸浸出过程中微晶石墨的净化机理和非碳杂质的溶解

IF 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-07-18 DOI: 10.1007/s00269-024-01290-9

Zhang Xiyue, Sun Hongjuan, Peng Tongjiang, Zeng Li, Liu Bo

{"title":"Purification mechanism of microcrystalline graphite and dissolution of non-carbon impurity during alkali autoclave-acid leaching","authors":"Zhang Xiyue, Sun Hongjuan, Peng Tongjiang, Zeng Li, Liu Bo","doi":"10.1007/s00269-024-01290-9","DOIUrl":"https://doi.org/10.1007/s00269-024-01290-9","url":null,"abstract":"Low impurity content is crucial for graphite applications and microcrystalline graphite is an important candidate material. In this study, natural microcrystalline graphite, with a fixed carbon content of 76.65%, was purified by an alkaline autoclave-acid leaching method. The effects of the mole ratio of NaOH to Si and Al in graphite, the liquid–solid ratio of NaOH solution and graphite, alkali autoclave temperature and reaction time on the purity of microcrystalline graphite were studied. Results showed that the dissolution and phase transformation of non-carbon impurities were closely related to the purification process. During the alkali autoclave stage, complete dissolution of quartz was observed. The Si–O tetrahedra and Al–O octahedra structures in aluminosilicate minerals were damaged and [Al (OH)4]−, [H2SiO4]2− and [SiO2 (OH)3]− were released. The soluble silicate and aluminate ions underwent recrystallization, producing cancrinite and sodalite that could be dissolved by acid leaching, resulting in purified microcrystalline graphite. The purity of microcrystalline graphite was further improved due to the autoclave treatment allowed NaOH solution to penetrate into the cracks of microcrystalline graphite aggregates under high pressure. In addition, the acid solution could enter the micropores left by alkali etching to dissolve the residual impurities. The fixed carbon content of microcrystalline graphite could be increased to 99.9% through the alkaline autoclave-acid leaching method.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739899","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

Atomic resolution transmission electron microscopy visualisation of channel occupancy in beryl in different crystallographic directions 用原子分辨率透射电子显微镜观察绿柱石在不同晶体学方向上的通道占用情况

IF 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-07-05 DOI: 10.1007/s00269-024-01285-6

Carina Silke Hanser, Per Erik Vullum, Antonius Theodorus Johannes van Helvoort, Fabian Dietmar Schmitz, Tobias Häger, Roman Botcharnikov, Bodil Holst

{"title":"Atomic resolution transmission electron microscopy visualisation of channel occupancy in beryl in different crystallographic directions","authors":"Carina Silke Hanser, Per Erik Vullum, Antonius Theodorus Johannes van Helvoort, Fabian Dietmar Schmitz, Tobias Häger, Roman Botcharnikov, Bodil Holst","doi":"10.1007/s00269-024-01285-6","DOIUrl":"https://doi.org/10.1007/s00269-024-01285-6","url":null,"abstract":"The causes of colour in beryl have been a research topic for decades. For some varieties, such as emerald (green, coloured by Cr3+ and/or V3+), the main cause of colour is substitutions by metal atoms within the framework. However, the causes for the yellow and blue colours in heliodor, golden beryl and aquamarine are still debated. It is generally agreed that Fe ions are responsible for the colour, but there are differing conclusions about the valence states of these ions, the occupied positions and the colour-inducing processes involved. The colour of aquamarine is commonly attributed to intervalence charge transfer (IVCT) between Fe3+ and Fe2+. Various combinations of sites have been proposed to host the Fe ions engaging in this IVCT. Here we present a new approach to address the topic of colour generation: atomic resolution scanning transmission electron microscopy (STEM). For the first time, atomic resolution images of a beryl (natural aquamarine) are presented in the three crystallographic directions [0001], [1-210] and [1-100]. Ions are clearly resolved in the channels. From the ratio of channel occupation and the correlation of the atoms per formula unit (apfu) calculations we conclude that Fe resides in the framework, not in the channels. The projections in the [1-210] direction directly show that the cavity channel site 2a is occupied, most likely by Cs, in agreement with recent results in the literature.","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547112","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

The packing fraction of the oxygen sublattice: its impact on the heat of mixing 氧亚晶格的堆积分数：对混合热的影响

IF 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-06-04 DOI: 10.1007/s00269-024-01277-6

Artur Benisek, Edgar Dachs

{"title":"The packing fraction of the oxygen sublattice: its impact on the heat of mixing","authors":"Artur Benisek, Edgar Dachs","doi":"10.1007/s00269-024-01277-6","DOIUrl":"https://doi.org/10.1007/s00269-024-01277-6","url":null,"abstract":"The heat of mixing of some petrological relevant substitutions (i.e., Mg-Al, Si-Al, Mg-Ti, Mg-Ca, and Mg-Fe) was investigated systematically in silicates, titanates, tungstates, carbonates, oxides, hydroxides, and sulphates by density functional theory calculations (e.g., melilite, chlorite, biotite, brucite, cordierite, amphibole, talc, pseudobrookite, pyroxene, olivine, wadsleyite, ilmenite, MgWO4, ringwoodite (spinel), perovskite, pyrope-grossular, magnesite-calcite, MgO-CaO, anhydrous and different hydrated MgSO4). A specific substitution is characterised by different microscopic interaction energies in different minerals, e.g., the octahedral Mg-Al exchange on a single crystallographic site in pyroxene has a microscopic interaction energy that is more than twice compared to that in biotite. A comparative investigation of the heat of mixing using microscopic interaction energies on a single crystallographic site has the advantage that they are not influenced by cation ordering. They could be successfully correlated with the stiffnesses of the minerals, which in turn were scaled to the oxygen packing fraction, a parameter that is easily available for poorly investigated minerals. With this information, the interaction energies of a certain substitution can be transferred from minerals where they are well-known to mineral groups where they are less- or unknown. Using the cross-site terms and the microscopic interaction energies, the macroscopic interaction energies of the coupled substitution, e.g., Mg + Si = Al + Al, of biotite and pyroxene were calculated, which are, however, affected by cation ordering and different degrees of local charge balance, for which appropriate models are necessary.","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253506","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

On the crystal-chemistry of inderite, Mg[B_3O_3(OH)_5](H_2O)_4·H_2O 关于橄榄石（Mg[B_3O_3(OH)_5](H_2O)_4-H_2O）的晶体化学性质

IF 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-05-23 DOI: 10.1007/s00269-024-01281-w

G. Gatta, Silvia C. Capelli, D. Comboni, Enrico Cannaò

引用次数: 0

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 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-05-23 DOI: 10.1007/s00269-024-01279-4

Nicholas R. Jenkins, Xuan Zhou, Mithun Bhowmick, Claire L. McLeod, M. Krekeler

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 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-05-23 DOI: 10.1007/s00269-024-01283-8

I. Mashino, Takashi Yoshino, Takaya Mitsui, Kosuke Fujiwara, Máté Garai, Shigeru Yamashita

引用次数: 0

Dolomite thermal behaviour: A short review 白云石的热行为：简短回顾

IF 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-05-10 DOI: 10.1007/s00269-024-01272-x

L. C. Resio

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 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-05-09 DOI: 10.1007/s00269-024-01273-w

Panming Xue, Duojun Wang, Ruixin Zhang, Peng Chen, Kenan Han, Yang Cao

{"title":"Thermal expansion of talc at high temperature and implications for the exhumation of eclogites in subduction zones","authors":"Panming Xue, Duojun Wang, Ruixin Zhang, Peng Chen, Kenan Han, Yang Cao","doi":"10.1007/s00269-024-01273-w","DOIUrl":"https://doi.org/10.1007/s00269-024-01273-w","url":null,"abstract":"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 Å³, 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.","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929630","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

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 1.4 4区地球科学

Physics and Chemistry of Minerals Pub Date : 2024-05-09 DOI: 10.1007/s00269-024-01282-9

A. M. Ionov, O. I. Barkalov, D. A. Shulyatev, K. A. Gavrilicheva

{"title":"Experimental studies of charoite mineral transformations under thermal treatment","authors":"A. M. Ionov, O. I. Barkalov, D. A. Shulyatev, K. A. Gavrilicheva","doi":"10.1007/s00269-024-01282-9","DOIUrl":"https://doi.org/10.1007/s00269-024-01282-9","url":null,"abstract":"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.","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140929666","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