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Vibrational entropy of disordering in omphacite 复合土中无序的振动熵
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-11-27 DOI: 10.1007/s00269-023-01260-7
Artur Benisek, Edgar Dachs, Michael A. Carpenter, Bastian Joachim-Mrosko, Noreen M. Vielreicher, Manfred Wildner

The cations of an ordered omphacite from the Tauern window were gradually disordered in piston cylinder experiments at temperatures between 850 and 1150 °C. The samples were examined by X-ray powder diffraction and then investigated using low-temperature calorimetry and IR spectroscopy. The low-temperature heat capacity data were used to obtain the vibrational entropies, and the line broadening of the IR spectra served as a tool to investigate the disordering enthalpy. These data were then used to calculate the configurational entropy as a function of temperature. The vibrational entropy does not change during the cation ordering phase transition from space group C2/c to P2/n at 865 °C but increases with a further temperature increase due to the reduction of short-range order.

在850 ~ 1150℃的温度下,从陶恩窗口得到的有序复相石的阳离子逐渐无序。采用x射线粉末衍射法对样品进行了检测,然后采用低温量热法和红外光谱法对样品进行了研究。用低温热容数据获得了振动熵,并用红外光谱的谱线展宽作为研究无序焓的工具。这些数据随后被用来计算作为温度函数的构型熵。865℃时,从空间群C2/c到空间群P2/n的阳离子有序相变过程中,振动熵没有变化,但随着温度的进一步升高,由于短程序的降低,振动熵增加。
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引用次数: 0
The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 体系中的固溶体为NaMgAl(SO4)3 - kmgal (SO4)3
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-11-27 DOI: 10.1007/s00269-023-01259-0
Peter Grouleff Jensen, Tonci Balic-Zunic, Ulla Gro Nielsen, Philip Miguel Kofoed

We synthesized six samples in the compositional field NaMgAl(SO4)3–KMgAl(SO4)3 in 20 mol% increments from pure Na to pure K compounds. We investigated them by Powder X-Ray diffraction, 23Na, and 27Al Nuclear Magnetic Resonance spectroscopy. The results confirm NaMgAl(SO4)3 as a unique phase identical to a presumed new mineral found in the fumaroles of Eldfell and Hekla volcanoes in Iceland. It tolerates less than 10 mol% K substitution for Na. There exists a compositional gap to approximately Na0.65K0.35MgAl(SO4)3 from where a solid solution extends to KMgAl(SO4)3. The mineral koryakite [NaKMg2Al2(SO4)6] is a member of the latter solid solution series. The crystal structures of all (Na,K)MgAl(SO4)3 phases are akin to NASICON (NA Super Ionic CONductor). NaMgAl(SO4)3 has (Roverline{3}c) symmetry and a disordered distribution of Mg and Al among the octahedral sites with only one unique site for the alkali atom. The members of the solid solution have (Roverline{3}) symmetry with ordered Mg–Al distribution and two unique alkali sites with different preferences for Na and K. In the crystal structure, the coordination of Na and/or K is trigonal antiprismatic, and these share bases with two octahedral Mg (Na) or Al (K) coordinations. These polyhedra are arranged in columns parallel to [001] and interconnected by SO4 tetrahedral groups. The alkali atoms from a column lie in the same (001) layers as the octahedrally coordinated atoms from the three neighboring rows. On the same level, parallel to (001), there are gaps in the other three neighboring columns forming channels containing Na+ or K+ ions.

在20 mol / l的合成范围内合成了NaMgAl(SO4)3 - kmgal (SO4)3% increments from pure Na to pure K compounds. We investigated them by Powder X-Ray diffraction, 23Na, and 27Al Nuclear Magnetic Resonance spectroscopy. The results confirm NaMgAl(SO4)3 as a unique phase identical to a presumed new mineral found in the fumaroles of Eldfell and Hekla volcanoes in Iceland. It tolerates less than 10 mol% K substitution for Na. There exists a compositional gap to approximately Na0.65K0.35MgAl(SO4)3 from where a solid solution extends to KMgAl(SO4)3. The mineral koryakite [NaKMg2Al2(SO4)6] is a member of the latter solid solution series. The crystal structures of all (Na,K)MgAl(SO4)3 phases are akin to NASICON (NA Super Ionic CONductor). NaMgAl(SO4)3 has (Roverline{3}c) symmetry and a disordered distribution of Mg and Al among the octahedral sites with only one unique site for the alkali atom. The members of the solid solution have (Roverline{3}) symmetry with ordered Mg–Al distribution and two unique alkali sites with different preferences for Na and K. In the crystal structure, the coordination of Na and/or K is trigonal antiprismatic, and these share bases with two octahedral Mg (Na) or Al (K) coordinations. These polyhedra are arranged in columns parallel to [001] and interconnected by SO4 tetrahedral groups. The alkali atoms from a column lie in the same (001) layers as the octahedrally coordinated atoms from the three neighboring rows. On the same level, parallel to (001), there are gaps in the other three neighboring columns forming channels containing Na+ or K+ ions.
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引用次数: 0
Greenalite-Chamosite composition, geothermometry and oxygen fugacity variations in pisolitic ironstone and carbonates of the Chilpi Group: implication on Paleoproterozoic seawater chemistry 七皮群泥质铁石和碳酸盐绿绿岩-绿辉岩组成、地球温度和氧逸度变化:对古元古代海水化学的启示
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-11-16 DOI: 10.1007/s00269-023-01258-1
Sarada P. Mohanty, Prasanta K. Mishra

Iron-rich rocks of Orosirian Period in the Chilpi Group on the northern margin of the Bastar Craton, Central India, contain an association of hematite-magnetite-greenalite-chamosite-quartz in oxide-silicate facies. Additionally chert (quartz) and siderite occur in chert and carbonate facies. Presence of these mineral assemblages was investigated to infer the redox state of the depositional basin. The results have indicated formation temperature variation of 116–255 °C (average 198 °C) and log P(O2) between  – 37 and  – 60 (average –44). A ferruginous state of the shallow water depositional environment, having oxygen content of 10–2 to 10–5 times the present atmospheric level, is inferred. The variations in composition of greenalite-chamosite association indicate development of the mineral phases from the reaction involving kaolinite-illite and magnetite-siderite as end-members. Thermodynamic requirements for the formation of the rare association of magnetite-greenalite-cronstedtite indicate the precipitation of the mineral phases from seawater with enhanced activities of Fe2+, Al, Si, Mg and C compared to the level in the present day seawater. The results indicate a steep fall in the atmospheric oxygen content immediately after the Great Oxidation Event of 2400–2000 Ma.

印度中部Bastar克拉通北缘Chilpi群奥罗世富铁岩石中含有赤铁矿-磁铁矿-绿绿岩-绿辉石-石英组合,呈氧化硅酸盐相。另外,燧石(石英)和菱铁矿产于燧石相和碳酸盐相。研究了这些矿物组合的存在,以推断沉积盆地的氧化还原状态。结果表明,地层温度变化范围为116 ~ 255°C(平均198°C),测井P(O2)在- 37 ~ - 60(平均- 44)之间。推断浅水沉积环境为含铁状态,含氧量为当前大气水平的10-2至10-5倍。绿绿石-绿辉石组合组成的变化表明,以高岭石-伊利石和磁铁矿-菱铁矿为端元的反应形成了矿物相。形成磁铁矿-绿绿石-长角辉石矿组合的热力学要求表明,海水中沉淀的矿物相与现在海水中的Fe2+、Al、Si、Mg和C的活性相比有所增强。结果表明,在2400-2000 Ma的大氧化事件发生后,大气中氧含量急剧下降。
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引用次数: 0
Crystal chemistry and thermal behavior of B-, S- and Na-bearing spurrite 含B-、S-和na晶突的晶体化学和热行为
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-10-28 DOI: 10.1007/s00269-023-01257-2
M. G. Krzhizhanovskaya, N. V. Chukanov, A. S. Mazur, L. A. Pautov, D. A. Varlamov, V. N. Bocharov

Spurrite from Negra Mine, Queretaro, Mexico is characterized by a complex chemical composition. Its empirical formula derived based on electron microprobe, wet chemical analyses and gas chromatography of annealing products is H0.18Ca5.01Na0.05[(SiO4)1.91(SO4)0.08)][(CO3)0.71(BO3)0.28]O11. The mineral was studied by single-crystal X-ray diffraction (SCXRD) as well as infrared (IR), Raman and nuclear magnetic resonance (NMR) spectroscopy. According to spectroscopic data, boron has three-fold coordination and sulfur occurs in the mineral in the sulfate form. A significant portion of carbonate groups is substituted by BO33– anions. Charge compensation is achieved due to the substitution of a part of SiO44– anions by SO42– groups, as well as to the admixture of sodium. SCXRD shows that sodium occurs in its own site with a low occupancy. The studied sample is isotypic with the synthetic NaCa5(SiO4)2(BO3) compound. The IR spectrum shows possible partial protonation of the SiO4 tetrahedra whereas bands of H2O molecules and isolated OH anions are not observed. Thermal behavior of B,S,Na-bearing spurrite from Negra Mine has been studied using powder high-temperature X-ray diffraction (HTXRD) together with boron poor and S-free spurrite from Fuka Area (Japan). The studied samples are stable up to ~ 1200 °C and ~ 1100 °C, respectively, whereas synthetic B,S-free spurrite decomposes at about 900 °C. The thermal expansion is significantly anisotropic and is observed mainly in the direction perpendicular to the ac plane which is coplanar with the layers of calcium polyhedra and anionic pseudo-layers formed by (C,B)O3 triangles and (Si,S)O4 tetrahedra. Isomorphism and a similarity of the thermal, baric and compositional (C-B substitution) deformations of spurrite-like structures are discussed.

来自墨西哥克雷塔罗的Negra矿的刺辉石具有复杂的化学成分。通过电子探针、湿化学分析、气相色谱等方法推导出的经验公式为:H0.18Ca5.01Na0.05[(SiO4)1.91(SO4)0.08)][(CO3)0.71(BO3)0.28]O11。采用单晶x射线衍射(SCXRD)、红外(IR)、拉曼(Raman)和核磁共振(NMR)光谱对该矿物进行了研究。根据光谱数据,硼具有三重配位,硫以硫酸盐形式存在于矿物中。相当一部分的碳酸盐基团被BO33 -阴离子取代。电荷补偿是由于部分SiO44 -阴离子被SO42 -基团取代,以及钠的混合物。SCXRD表明,钠离子在其自身的位置发生,占用率低。所研究的样品与合成的NaCa5(SiO4)2(BO3)化合物是同型的。红外光谱显示了SiO4四面体可能的部分质子化,而没有观察到H2O分子和孤立的OH -阴离子带。采用粉末高温x射线衍射(HTXRD)技术,对日本福卡地区贫硼无S直晶和Negra矿含B、S、na直晶的热行为进行了研究。所研究的样品分别在~ 1200℃和~ 1100℃下稳定,而合成的无B, s刺激石在900℃左右分解。热膨胀具有明显的各向异性,主要发生在与钙多面体层和由(C,B)O3三角形和(Si,S)O4四面体组成的阴离子伪层共面垂直的ac面方向。讨论了类刺晶结构的热变形、压变形和组分(C-B取代)变形的同构性和相似性。
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引用次数: 0
Lattice dynamics, sound velocities, and atomic environments of szomolnokite at high pressure 晶格动力学、声速和高压下的原子环境
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-10-24 DOI: 10.1007/s00269-023-01255-4
Olivia S. Pardo, Vasilije V. Dobrosavljevic, Wolfgang Sturhahn, Thomas S. Toellner, Benjamin Strozewski, Jennifer M. Jackson

Complex mixtures of sulfates, silicates, and ice have been observed in a variety of planetary environments on Earth, Mars and the icy satellites of the solar system. Characterizing the properties of the corresponding compositional endmembers is important for understanding the interiors of a range of planetary bodies in which these phases are observed. To measure the electronic and vibrational properties of the pure ferrous iron endmember of the kieserite group, szomolnokite, (FeSO4⋅H2O), we have performed synchrotron 57Fe nuclear resonant inelastic and forward scattering experiments in the diamond-anvil cell up to 14.5 GPa. This pressure range covers depths within Earth’s interior relevant to sulfur cycling in subduction zones and the range of pressures expected within icy satellite interiors. We find evidence of crystal lattice softening, changes in elastic properties, and changes in the electric field gradients of iron atoms associated with two structural transitions occurring within the experimental pressure range. We apply these findings to icy satellite interiors, including discussion of elastic properties, modeling of ice-sulfate aggregates, and implications for tidal observations.

硫酸盐、硅酸盐和冰的复杂混合物已经在地球、火星和太阳系的冰冻卫星上的各种行星环境中被观察到。表征相应组成端元的性质对于理解一系列观测到这些相的行星体的内部是很重要的。为了测量纯亚铁基基端元szomolnokite (FeSO4⋅H2O)的电子和振动特性,我们在高达14.5 GPa的金刚石砧池中进行了同步加速器57Fe核共振非弹性和正向散射实验。这个压力范围涵盖了地球内部与俯冲带硫循环有关的深度,以及冰冻卫星内部的预期压力范围。我们发现在实验压力范围内发生的两种结构转变与晶格软化、弹性性能的变化和铁原子电场梯度的变化有关。我们将这些发现应用于冰冷的卫星内部,包括对弹性特性的讨论,冰-硫酸盐聚集体的建模,以及对潮汐观测的影响。
{"title":"Lattice dynamics, sound velocities, and atomic environments of szomolnokite at high pressure","authors":"Olivia S. Pardo,&nbsp;Vasilije V. Dobrosavljevic,&nbsp;Wolfgang Sturhahn,&nbsp;Thomas S. Toellner,&nbsp;Benjamin Strozewski,&nbsp;Jennifer M. Jackson","doi":"10.1007/s00269-023-01255-4","DOIUrl":"10.1007/s00269-023-01255-4","url":null,"abstract":"<div><p>Complex mixtures of sulfates, silicates, and ice have been observed in a variety of planetary environments on Earth, Mars and the icy satellites of the solar system. Characterizing the properties of the corresponding compositional endmembers is important for understanding the interiors of a range of planetary bodies in which these phases are observed. To measure the electronic and vibrational properties of the pure ferrous iron endmember of the kieserite group, szomolnokite, (FeSO<sub>4</sub>⋅H<sub>2</sub>O), we have performed synchrotron <sup>57</sup>Fe nuclear resonant inelastic and forward scattering experiments in the diamond-anvil cell up to 14.5 GPa. This pressure range covers depths within Earth’s interior relevant to sulfur cycling in subduction zones and the range of pressures expected within icy satellite interiors. We find evidence of crystal lattice softening, changes in elastic properties, and changes in the electric field gradients of iron atoms associated with two structural transitions occurring within the experimental pressure range. We apply these findings to icy satellite interiors, including discussion of elastic properties, modeling of ice-sulfate aggregates, and implications for tidal observations.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797330","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
Crystal–melt interfaces in Mg2SiO4 at high pressure: structural and energetics insights from first-principles simulations 高压下Mg2SiO4晶体-熔体界面:来自第一性原理模拟的结构和能量学见解
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-10-09 DOI: 10.1007/s00269-023-01256-3
Bijaya B. Karki, Dipta B. Ghosh, Jianwei Wang, Shun-ichiro Karato

The interplay between crystal–melt and grain boundary interfaces in partially melted polycrystalline aggregates controls many physical properties of mantle rocks. To understand this process at the fundamental level requires improved knowledge about the interfacial structures and energetics. Here, we report the results of first-principles molecular dynamics simulations of two grain boundaries of (0l1)/[100] type for tilt angles of 30.4° and 49.6° and the corresponding solid–liquid interfaces in Mg2SiO4 forsterite at the conditions of the upper mantle. Our analysis of the simulated position time series shows that structural distortions at the solid–liquid interfacial region are stronger than intergranular interfacial distortions. The calculated formation enthalpy of the solid–solid interfaces increases nearly linearly from 1.0 to 1.4 J/m2 for the 30.4° tilt and from 0.8 to 1.0 J/m2 for the 49.6° tilt with pressure from 0 to 16 GPa at 1500 K, being consistent with the experimental data. The solid–liquid interfacial enthalpy takes comparable values in the range 0.9 to 1.5 J/m2 over similar pressure interval. The dihedral angle of the forsterite–melt system estimated using these interfacial enthalpies takes values in the range of 67° to 146°, showing a decreasing trend with pressure. The predicted dihedral angle is found to be generally larger than the measured data for silicate systems, probably caused by compositional differences between the simulation and the measurements.

部分熔融多晶聚集体中晶体熔体与晶界界面的相互作用控制着地幔岩石的许多物理性质。要在基本层面上理解这一过程,需要提高对界面结构和能量学的认识。本文报道了上地幔条件下Mg2SiO4 forsterite中(0l1)/[100]型两种晶界(倾角分别为30.4°和49.6°)和固液界面的第一性原理分子动力学模拟结果。我们对模拟位置时间序列的分析表明,固液界面区域的结构畸变比晶间界面畸变更强。在1500 K压力下,当压力从0 ~ 16 GPa时,计算得到的固-固界面形成焓在30.4°倾斜时从1.0 ~ 1.4 J/m2增加到49.6°倾斜时从0.8 ~ 1.0 J/m2增加到1.0 J/m2,与实验数据一致。在相似的压力区间内,固液界面焓值为0.9 ~ 1.5 J/m2。利用这些界面焓值估算的熔体体系的二面角在67°~ 146°之间,随压力的增大呈减小趋势。预测的二面角普遍大于硅酸盐体系的实测数据,这可能是由于模拟和实测之间的成分差异造成的。
{"title":"Crystal–melt interfaces in Mg2SiO4 at high pressure: structural and energetics insights from first-principles simulations","authors":"Bijaya B. Karki,&nbsp;Dipta B. Ghosh,&nbsp;Jianwei Wang,&nbsp;Shun-ichiro Karato","doi":"10.1007/s00269-023-01256-3","DOIUrl":"10.1007/s00269-023-01256-3","url":null,"abstract":"<div><p>The interplay between crystal–melt and grain boundary interfaces in partially melted polycrystalline aggregates controls many physical properties of mantle rocks. To understand this process at the fundamental level requires improved knowledge about the interfacial structures and energetics. Here, we report the results of first-principles molecular dynamics simulations of two grain boundaries of (0<i>l</i>1)/[100] type for tilt angles of 30.4° and 49.6° and the corresponding solid–liquid interfaces in Mg<sub>2</sub>SiO<sub>4</sub> forsterite at the conditions of the upper mantle. Our analysis of the simulated position time series shows that structural distortions at the solid–liquid interfacial region are stronger than intergranular interfacial distortions. The calculated formation enthalpy of the solid–solid interfaces increases nearly linearly from 1.0 to 1.4 J/m<sup>2</sup> for the 30.4° tilt and from 0.8 to 1.0 J/m<sup>2</sup> for the 49.6° tilt with pressure from 0 to 16 GPa at 1500 K, being consistent with the experimental data. The solid–liquid interfacial enthalpy takes comparable values in the range 0.9 to 1.5 J/m<sup>2</sup> over similar pressure interval. The dihedral angle of the forsterite–melt system estimated using these interfacial enthalpies takes values in the range of 67° to 146°, showing a decreasing trend with pressure. The predicted dihedral angle is found to be generally larger than the measured data for silicate systems, probably caused by compositional differences between the simulation and the measurements.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00269-023-01256-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134795619","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
Crystal structures inherited from parent high-temperature disordered microblocks: Ca2SiO4, Na2SO4–K2SO4 sulfates, and related minerals (bubnovaite and dobrovolskyite) 继承自母体高温无序微块的晶体结构:Ca2SiO4、Na2SO4-K2SO4硫酸盐及其相关矿物(布氏云母和多布氏云母)
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-10-06 DOI: 10.1007/s00269-023-01253-6
Andrey P. Shablinskii, Stanislav K. Filatov, Yaroslav P. Biryukov

Crystal structures of Ca2SiO4, Na2SO4–K2SO4 sulfates, and related minerals bubnovaite K2Na8Ca(SO4)6 and dobrovolskyite Na4Ca(SO4)3 were described as consisting of microblocks for the first time. A microblock [M(TO4)6] that consisted of an octahedron interlinked by six vertices with six adjacent tetrahedra was considered a structural unit inherited upon cooling from a high-temperature disordered parent unit. The relationship between the parent and inherited microblocks was established. Based on this relationship, 15 possible types of microblocks maintaining a trigonal symmetry were derived. The minerals and compounds structurally related to α-Na2SO4-derived superstructures were formed as a result of the cooling of the high-temperature phases containing the disordered parent microblock. Here, the inheritance driving force was the tendency of the structure to become ordered upon cooling. The reasons for the formation of a microblock from the parent microblock were mainly determined by the ionic radius and type of cation occupying the octahedral site. The identification of minerals with the described structural features could be a promising tool for the synthesis of novel compounds with useful properties.

本文首次描述了Ca2SiO4、Na2SO4-K2SO4硫酸盐及其伴生矿物蓝辉石K2Na8Ca(SO4)6和dobrovolsky石Na4Ca(SO4)3由微块组成的晶体结构。微块[M(TO4)6]由一个八面体和六个相邻的四面体组成,由六个顶点相互连接,被认为是一个由高温无序母单元冷却后继承的结构单元。建立了亲本微块与遗传微块之间的关系。基于这一关系,推导出了15种可能的保持三角对称的微块类型。在结构上与α- na2so4衍生的上层结构相关的矿物和化合物是由于含有无序母块的高温相冷却而形成的。在这里,遗传驱动力是结构在冷却后变得有序的趋势。由母体微块形成微块的原因主要取决于占据八面体位置的离子半径和阳离子类型。鉴定具有上述结构特征的矿物可能是合成具有有用性质的新化合物的有前途的工具。
{"title":"Crystal structures inherited from parent high-temperature disordered microblocks: Ca2SiO4, Na2SO4–K2SO4 sulfates, and related minerals (bubnovaite and dobrovolskyite)","authors":"Andrey P. Shablinskii,&nbsp;Stanislav K. Filatov,&nbsp;Yaroslav P. Biryukov","doi":"10.1007/s00269-023-01253-6","DOIUrl":"10.1007/s00269-023-01253-6","url":null,"abstract":"<div><p>Crystal structures of Ca<sub>2</sub>SiO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</sub>–K<sub>2</sub>SO<sub>4</sub> sulfates, and related minerals bubnovaite K<sub>2</sub>Na<sub>8</sub>Ca(SO<sub>4</sub>)<sub>6</sub> and dobrovolskyite Na<sub>4</sub>Ca(SO<sub>4</sub>)<sub>3</sub> were described as consisting of microblocks for the first time. A microblock [<i>M</i>(<i>T</i>O<sub>4</sub>)<sub>6</sub>] that consisted of an octahedron interlinked by six vertices with six adjacent tetrahedra was considered a structural unit inherited upon cooling from a high-temperature disordered parent unit. The relationship between the parent and inherited microblocks was established. Based on this relationship, 15 possible types of microblocks maintaining a trigonal symmetry were derived. The minerals and compounds structurally related to α-Na<sub>2</sub>SO<sub>4</sub>-derived superstructures were formed as a result of the cooling of the high-temperature phases containing the disordered parent microblock. Here, the inheritance driving force was the tendency of the structure to become ordered upon cooling. The reasons for the formation of a microblock from the parent microblock were mainly determined by the ionic radius and type of cation occupying the octahedral site. The identification of minerals with the described structural features could be a promising tool for the synthesis of novel compounds with useful properties.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134795563","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
Crystal structure and high-pressure phase behavior of a CaCO3–SrCO3 solid solution CaCO3-SrCO3固溶体的晶体结构和高压相行为
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-09-30 DOI: 10.1007/s00269-023-01252-7
Lea Pennacchioni, Naira S. Martirosyan, Anna Pakhomova, Jannes König, Richard Wirth, Sandro Jahn, Monika Koch-Müller, Sergio Speziale

A synthetic (hbox {CaCO}_{3})(hbox {SrCO}_{3}) solid solution with composition (hbox {Ca}_{0.82}hbox {Sr}_{0.18}) (hbox {CO}_{3}) was investigated by single-crystal X-ray diffraction in the pressure range between 0 and 22 GPa using different pressure-transmitting media. The samples were compressed in DACs using Ne up to (sim)9 GPa and Ar up to (sim)22 GPa. At ambient conditions, (hbox {Ca}_{0.82}hbox {Sr}_{0.18}) (hbox {CO}_{3}) crystallizes in a monoclinic structure, isostructural to (hbox {CaCO}_{3})-II, Sr-calcite-II (Sr-CC-II), with space group (P2_1/c), 4 formula units per unit cell, Z, (a = 6.4237(7)) Å, (b = 5.0176(1)) Å, (c = 8.1129(1)) Å, (beta = 108.064(1)^circ) and (V=248.60(1)) Å(^3) (where the number in parenthesis is 1(sigma) uncertainties on the last digit). At 1.72(5) GPa, a structural phase transition is observed to a new monoclinic structure, Sr-calcite-IIIc (Sr-CC-IIIc), with space group (P2_1/m) and (Z=8) ((a~=~6.2683(2)) Å, (b = 9.9220(5)) Å, (c = 7.6574(6)) Å, (beta = 103.856(6)^circ) and (V = 462.39(5)) Å(^3)), different from any pure (hbox {CaCO}_{3}) polymorph. At 12 GPa, the sample transformed to a triclinic structure, Sr-calcite-IIIb (Sr-CC-IIIb), with space group (P{bar{1}}) and (Z=4) ( (a=6.059(5)) Å, (b=6.280(2)) Å, (c=6.331(2)) Å, (alpha =95.20(3)^circ), (beta =108.89(5)^circ), (gamma =110.52(5)^circ) and (V=207.7(2)) Å(^3)), isostructural to end-member (hbox {CaCO}_{3})-IIIb. Finally, at 17 GPa, a transition is observed to Sr-calcite-VI (Sr-CC-VI), with space group (P{bar{1}}) and (Z=2) ((a=3.444(3)) Å, (b=4.985(4)) Å, (c=5.761(5)) Å, (alpha =77.05(7)^circ), (beta =84.92(7)^circ), (gamma =89.00(7)^circ) and (V=96.0(1)) Å(^3)), isostructural to end-member (hbox {CaCO}_{3})-VI, which is preserved up to the maximum investigated pressure of 22 GPa. The results of this study show the effect of Sr/Ca cationic substitution on the high-pressure behavior and physical properties of a (hbox {CaCO}_{3})(hbox {SrCO}_{3}) solid solution. The phase evolution of (hbox {Ca}_{0.82}hbox {Sr}_{0.18}hbox {CO}_3) and the crystallization of a new phase, Sr-CC-IIIc, different from the high-pressure polymorphs of end-member (hbox {CaCO}_{3}), point to the importance of extending the study of carbonates to more complex systems than pure end-member compositions.

在0 ~ 22 GPa的压力范围内,采用不同的传压介质,用单晶x射线衍射研究了合成的成分为(hbox {Ca}_{0.82}hbox {Sr}_{0.18})(hbox {CO}_{3})的(hbox {CaCO}_{3}) - (hbox {SrCO}_{3})固溶体。样品在dac中压缩,使用最高为(sim) 9 GPa的Ne和最高为(sim) 22 GPa的Ar。在环境条件下,(hbox {Ca}_{0.82}hbox {Sr}_{0.18})(hbox {CO}_{3})结晶为单棱柱状结构,同结构为(hbox {CaCO}_{3}) -II, Sr-calcite-II (sr - ccc -II),空间群为(P2_1/c),每单元有4个公式单位,Z, (a = 6.4237(7)) Å, (b = 5.0176(1)) Å, (c = 8.1129(1)) Å, (beta = 108.064(1)^circ)和(V=248.60(1)) Å (^3)(括号中的数字为1 (sigma)最后一位的不确定度)。在1.72(5)GPa处,观察到一个新的单斜晶型Sr-calcite-IIIc (sr -c - iiic)的结构相变,其空间群为(P2_1/m)和(Z=8) ((a~=~6.2683(2)) Å, (b = 9.9220(5)) Å, (c = 7.6574(6)) Å, (beta = 103.856(6)^circ)和(V = 462.39(5)) Å (^3)),不同于任何纯(hbox {CaCO}_{3})多晶型。在12 GPa下,样品转变为三线状结构Sr-calcite-IIIb (Sr-CC-IIIb),具有空间群(P{bar{1}})和(Z=4) ((a=6.059(5)) Å, (b=6.280(2)) Å, (c=6.331(2)) Å, (alpha =95.20(3)^circ), (beta =108.89(5)^circ), (gamma =110.52(5)^circ)和(V=207.7(2)) Å (^3)),端元(hbox {CaCO}_{3}) -IIIb等结构。最后,在17 GPa处,观察到Sr-calcite-VI (Sr-CC-VI)的转变,其空间群为(P{bar{1}})和(Z=2) ((a=3.444(3)) Å, (b=4.985(4)) Å, (c=5.761(5)) Å, (alpha =77.05(7)^circ), (beta =84.92(7)^circ), (gamma =89.00(7)^circ)和(V=96.0(1)) Å (^3)),与端元(hbox {CaCO}_{3}) -VI的结构相同,直至最大研究压力为22 GPa。研究结果表明Sr/Ca阳离子取代对(hbox {CaCO}_{3}) - (hbox {SrCO}_{3})固溶体高压行为和物理性质的影响。(hbox {Ca}_{0.82}hbox {Sr}_{0.18}hbox {CO}_3)的相演化和Sr-CC-IIIc的结晶不同于端元(hbox {CaCO}_{3})的高压多晶,这表明将碳酸盐的研究扩展到比纯端元组成更复杂的体系的重要性。
{"title":"Crystal structure and high-pressure phase behavior of a CaCO3–SrCO3 solid solution","authors":"Lea Pennacchioni,&nbsp;Naira S. Martirosyan,&nbsp;Anna Pakhomova,&nbsp;Jannes König,&nbsp;Richard Wirth,&nbsp;Sandro Jahn,&nbsp;Monika Koch-Müller,&nbsp;Sergio Speziale","doi":"10.1007/s00269-023-01252-7","DOIUrl":"10.1007/s00269-023-01252-7","url":null,"abstract":"<div><p>A synthetic <span>(hbox {CaCO}_{3})</span>–<span>(hbox {SrCO}_{3})</span> solid solution with composition <span>(hbox {Ca}_{0.82}hbox {Sr}_{0.18})</span> <span>(hbox {CO}_{3})</span> was investigated by single-crystal X-ray diffraction in the pressure range between 0 and 22 GPa using different pressure-transmitting media. The samples were compressed in DACs using Ne up to <span>(sim)</span>9 GPa and Ar up to <span>(sim)</span>22 GPa. At ambient conditions, <span>(hbox {Ca}_{0.82}hbox {Sr}_{0.18})</span> <span>(hbox {CO}_{3})</span> crystallizes in a monoclinic structure, isostructural to <span>(hbox {CaCO}_{3})</span>-II, Sr-calcite-II (Sr-CC-II), with space group <span>(P2_1/c)</span>, 4 formula units per unit cell, <i>Z</i>, <span>(a = 6.4237(7))</span> Å, <span>(b = 5.0176(1))</span> Å, <span>(c = 8.1129(1))</span> Å, <span>(beta = 108.064(1)^circ)</span> and <span>(V=248.60(1))</span> Å<span>(^3)</span> (where the number in parenthesis is 1<span>(sigma)</span> uncertainties on the last digit). At 1.72(5) GPa, a structural phase transition is observed to a new monoclinic structure, Sr-calcite-IIIc (Sr-CC-IIIc), with space group <span>(P2_1/m)</span> and <span>(Z=8)</span> (<span>(a~=~6.2683(2))</span> Å, <span>(b = 9.9220(5))</span> Å, <span>(c = 7.6574(6))</span> Å, <span>(beta = 103.856(6)^circ)</span> and <span>(V = 462.39(5))</span> Å<span>(^3)</span>), different from any pure <span>(hbox {CaCO}_{3})</span> polymorph. At 12 GPa, the sample transformed to a triclinic structure, Sr-calcite-IIIb (Sr-CC-IIIb), with space group <span>(P{bar{1}})</span> and <span>(Z=4)</span> ( <span>(a=6.059(5))</span> Å, <span>(b=6.280(2))</span> Å, <span>(c=6.331(2))</span> Å, <span>(alpha =95.20(3)^circ)</span>, <span>(beta =108.89(5)^circ)</span>, <span>(gamma =110.52(5)^circ)</span> and <span>(V=207.7(2))</span> Å<span>(^3)</span>), isostructural to end-member <span>(hbox {CaCO}_{3})</span>-IIIb. Finally, at 17 GPa, a transition is observed to Sr-calcite-VI (Sr-CC-VI), with space group <span>(P{bar{1}})</span> and <span>(Z=2)</span> (<span>(a=3.444(3))</span> Å, <span>(b=4.985(4))</span> Å, <span>(c=5.761(5))</span> Å, <span>(alpha =77.05(7)^circ)</span>, <span>(beta =84.92(7)^circ)</span>, <span>(gamma =89.00(7)^circ)</span> and <span>(V=96.0(1))</span> Å<span>(^3)</span>), isostructural to end-member <span>(hbox {CaCO}_{3})</span>-VI, which is preserved up to the maximum investigated pressure of 22 GPa. The results of this study show the effect of Sr/Ca cationic substitution on the high-pressure behavior and physical properties of a <span>(hbox {CaCO}_{3})</span>–<span>(hbox {SrCO}_{3})</span> solid solution. The phase evolution of <span>(hbox {Ca}_{0.82}hbox {Sr}_{0.18}hbox {CO}_3)</span> and the crystallization of a new phase, Sr-CC-IIIc, different from the high-pressure polymorphs of end-member <span>(hbox {CaCO}_{3})</span>, point to the importance of extending the study of carbonates to more complex systems than pure end-member compositions.","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797857","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
A correlation between hydroxyl vibrations under compression and anharmonicity: glaucophane as a test case 压缩下羟基振动与非谐和性之间的关系:作为测试案例的青绿色
IF 1.4 4区 地球科学 Q3 Earth and Planetary Sciences Pub Date : 2023-09-28 DOI: 10.1007/s00269-023-01254-5
Q. Williams

The infrared hydroxyl bands and first hydroxyl combination bands of glaucophane are characterized under pressure. In this weakly hydrogen-bonded mineral, the anharmonicity parameter, as determined from the difference between combinations and the fundamentals, is nearly constant with pressure to 15 GPa, indicating that the ambient pressure value of hydroxyl-bond anharmonicity closely reflects its value at high pressures. Given this near-constancy, the Grüneisen parameters of the hydroxyl stretching vibrations of a wide range of minerals, as derived from the pressure dependence of their O–H stretching frequencies, are correlated with the anharmonic parameter of each vibration, as determined from the ambient pressure offset of the summed frequencies of the fundamental n = 0 to 1 transitions and the frequency of the hydroxyl combination or overtone band corresponding to the n = 0 to 2 transition. This correlation is motivated by (1) the anharmonic origin of the Grüneisen parameter; and (2) the grossly similar form of the interatomic potential governing weak- and medium-strength hydrogen bonding in many minerals. This possible correlation provides a means through which the likely pressure-induced hydroxyl mode shifts of phases might be estimated from ambient pressure near-infrared measurements and emphasizes the importance of near-infrared combination/overtone band measurements. In this context, the combination/overtone bands of high-pressure hydrous phases are almost completely uncharacterized, and thus one probe of their anharmonicity has been neglected. Such information directly constrains the nature of hydrogen bonding in these phases, and hence provides possible insights into both their retention of hydrogen and its mobility. Deviations from the anharmonicity-Grüneisen parameter correlation, when observed (as may be the case in prehnite), could provide insights into anomalous effects on the hydroxyl potential well induced by bifurcated H-bonds, pressure-dependent Davydov splitting, or the influence of neighboring cations.

在压力作用下,对青绿色的红外羟基带和第一羟基组合带进行了表征。在这种弱氢键结合矿物中,由组合与基本面的差异确定的非调和性参数在压力至15 GPa时几乎不变,表明环境压力下羟基键非调和性值与高压下的值密切相关。鉴于这种近乎恒定的特性,各种矿物的羟基拉伸振动的grisen参数(源于它们的O-H拉伸频率的压力依赖性)与每个振动的非谐波参数相关,这是由基本n = 0到1过渡的总频率的环境压力偏移和羟基组合或泛音频带对应于n = 0到2过渡的频率确定的。这种相关性是由以下原因引起的:(1)粗尼森参数的非调和起源;(2)在许多矿物中,控制弱和中等强度氢键的原子间电位的形式非常相似。这种可能的相关性提供了一种方法,通过这种方法可以从环境压力近红外测量中估计可能由压力引起的羟基模式相移,并强调了近红外组合/泛音波段测量的重要性。在这种情况下,高压含水相的组合/泛音带几乎完全没有被表征,因此对其非调和性的探测被忽略了。这些信息直接限制了这些相中氢键的性质,从而为氢的保留及其迁移率提供了可能的见解。当观察到偏离非调和-颗粒neisen参数相关性时(如在prehnite中可能出现的情况),可以深入了解由分岔氢键、压力依赖性Davydov分裂或邻近阳离子的影响引起的羟基电位异常效应。
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引用次数: 0
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 Q3 Earth and Planetary Sciences 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
期刊
Physics and Chemistry of Minerals
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