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Journal articles on the topic 'Cotunnite'

Author: Grafiati

Published: 4 June 2025

Last updated: 23 June 2025

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1

Ohtaka, Osamu, Denis Andrault, Pierre Bouvier, Emmanuelle Schultz, and Mohamed Mezouar. "Phase relations and equation of state of ZrO2to 100 GPa." Journal of Applied Crystallography 38, no. 5 (2005): 727–33. http://dx.doi.org/10.1107/s0021889805018145.

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The phase relations and equation of state of ZrO2were investigated up to 100 GPa by means ofin situobservation using laser heating in a diamond anvil cell and synchrotron radiation. A cotunnite (PbCl2)-type phase, which appears above 12.5 GPa, is stable to a pressure of 100 GPa and a temperature of 2500 K. No post-cotunnite phase was observed under the present experimental conditions. The unit-cell parameters and the volumes of the cotunnite-type ZrO2were determined as a function of pressure at room temperature using a laser-annealing technique. The cotunnite-type ZrO2shows rather isotropic compression. The bulk modulus calculated using the Birch–Murnaghan equations of state is 278 GPa, which suggests that high-density ZrO2is a candidate for potentially very hard materials.In situhigh-temperature experiments performed below 12.5 GPa revealed that a tetragonal fluorite (CaF2)-type phase is stable up to 3000 K, although a cubic fluorite-type phase has been assumed to exist in this high-temperature regime. The result suggests the possibility that stoichiometric ZrO2does not show the cubic structure up to the melting temperature.

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2

Dubrovinskaia, N. A., L. S. Dubrovinsky, V. Swamy, and R. Ahuja. "Cotunnite-Structured Titanium Dioxide." High Pressure Research 22, no. 2 (2002): 391–94. http://dx.doi.org/10.1080/08957950212781.

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3

Leger, J. M., J. Haines, and A. Atouf. "The high pressure behaviour of the cotunnite and post-cotunnite phases of PbCl2 and SnCl2." Journal of Physics and Chemistry of Solids 57, no. 1 (1996): 7–16. http://dx.doi.org/10.1016/0022-3697(95)00060-7.

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4

Ohtaka, Osamu, Shoichi Kume, and Eiji Ito. "Stability Field of Cotunnite-Type Zirconia." Journal of the American Ceramic Society 73, no. 3 (1990): 744–45. http://dx.doi.org/10.1111/j.1151-2916.1990.tb06584.x.

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5

Reckeweg, Olaf, Falk Lissner, and Thomas Schleid. "Single Crystals of Cotunnite-Type YbH2." Zeitschrift für anorganische und allgemeine Chemie 638, no. 10 (2012): 1595. http://dx.doi.org/10.1002/zaac.201204058.

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6

Rewitzer, Christian, Miguel Calvo, Rupert Hochleitner, and Carlos Utrera. "Cotunnite, caracolite, sideronatrite and other rare secondary minerals in the Ferruginosa mine - Cabo de Palos, Cartagena, Murcia, Spain -." Mineral Up 5, no. 1 (2018): 66–79. https://doi.org/10.5281/zenodo.3686610.

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Ferruginosa mine is located in Cabo de Palos, Cartagena, Murcia, Spain. The alteration of the galena, which is the primary mineral, in an environment rich in chlorides, has led to the formation of some rare minerals, such as chlorargirite, paratacamite, penfieldite, lesukite, cotunnite and caracolite.

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7

Sorokin, N. I. "IONIC CONDUCTIVITY AT ROOM TEMPERATURE AND THERMAL STABILITY OF CHLORINE-CONDUCTING SOLID ELECTROLYTES." Кристаллография 68, no. 2 (2023): 171–79. http://dx.doi.org/10.31857/s0023476123020170.

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Search for chlorine-conducting solid electrolytes with a high ionic conductivity σ293K at room temperature (293 K) is based on the analysis of temperature measurements of the electrical conductivity σ(T) of simple and complex compounds, solid solutions, composites, and glasses. A comparison of the thermal stability of chlorides is based on the analysis of the dependences σ(T) in cyclic heating–cooling measurements and the physicochemical data. Maximum σ293 K values were found for the solid solutions (3 × 10−5 S/cm) and (1 × 10−4 S/cm). Promising directions of search for chlorine-ion solid electrolytes for chemical current sources and chlorine sensors operating at room temperature are the method of crystallochemical heterovalent substitutions and implementation of the vacancy mechanism of electrical conductivity in crystal structures of the cotunnite (PbCl2) and fluorite (CaF2) types. The parameters of the ionic conductivity of cotunnite and fluorite crystals of chlorides and fluorides are analyzed.

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8

Ohtaka, Osamu, Shoichi Kumi, and Eiji Ito. "Synthesis and Phase Stability of Cotunnite-Type Zirconia." Journal of the American Ceramic Society 71, no. 10 (1988): C448—C449. http://dx.doi.org/10.1111/j.1151-2916.1988.tb07525.x.

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9

Leger, J. M., and A. Atouf. "High-pressure phase transformation in cotunnite-type BaCl2." Journal of Physics: Condensed Matter 4, no. 2 (1992): 357–65. http://dx.doi.org/10.1088/0953-8984/4/2/005.

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10

ZHANG, TIAN, YAN CHENG, ZHEN-LONG LV, GUANG-FU JI, and MIN GONG. "PHASE TRANSITION AND THERMODYNAMIC PROPERTIES OF MAGNESIUM FLUORIDE BY FIRST PRINCIPLES." International Journal of Modern Physics B 28, no. 08 (2014): 1450026. http://dx.doi.org/10.1142/s021797921450026x.

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The structural stabilities, phase transitions and thermodynamic properties of MgF 2 under high pressure and temperature are investigated by first-principles calculations based on plane-wave pseudopotential density functional theory method within the local density approximation. The calculated lattice parameters of MgF 2 in all four phases under zero pressure and zero temperature are in good agreement with the existing experimental data and other theoretical results. Our results demonstrate that MgF 2 undergoes a series of structural phase transitions from rutile (P42/mnm)→ CaCl 2-type (Pnnm)→ modified fluorite (Pa-3)→ cotunnite (Pnam) under high pressure and the obtained transition pressures are in fairly good agreement with the experimental results. The temperature-dependent volume and thermodynamic properties of MgF 2 in the rutile phase at 0 GPa are presented and the thermodynamic properties of MgF 2 in the rutile, CaCl 2-type, modified fluorite and cotunnite phases at 300 K are also predicted using the quasi-harmonic approximation model (QHA) and the quasi-harmonic Debye model (QHD), respectively. Moreover, the partial density of states and the electronic density of the four phases under the phase transition are also investigated.

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11

Calvo, Miguel, and Joan Viñals. "Cotunnite, cumengeite, diaboleite and other lead and copper secondary minerals in the La Reixidora mine - Monte Bedures, Meredo, Vegadeo, Asturias, Spain." Mineral Up 5, no. 1 (2018): 26–30. https://doi.org/10.5281/zenodo.3667449.

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On the slopes of Monte Bedures, a hill located in Meredo, municipality of Vegadeo, Asturias, are the remains of a series of mine workings, some of them very old. These mines were probably worked in Roman times, for both lead and iron ores, and possibly also copper. In the La Reixidora mine, several rare minerals have been found, such as cotunnite, atacamite, diaboleite, cumengeite, phosgenite and caledonite.

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12

Goryaeva, A. M., V. L. Vinograd, B. Winkler, N. N. Eremin, and V. S. Urusov. "Anab initiostudy of ZrO2-HfO2solid solution with cotunnite structure." Acta Crystallographica Section A Foundations of Crystallography 67, a1 (2011): C710. http://dx.doi.org/10.1107/s0108767311082031.

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13

Jian-Zhi, Zhao, Wang Guang-Tao, and Liang Yong-Cheng. "Mechanical Properties and Electronic Structures of Cotunnite TiO 2." Chinese Physics Letters 25, no. 12 (2008): 4356–59. http://dx.doi.org/10.1088/0256-307x/25/12/048.

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14

Ahuja, Rajeev, and Leonid S. Dubrovinsky. "Cotunnite-Structured Titanium Dioxide and the Hardest known Oxide." High Pressure Research 22, no. 2 (2002): 429–33. http://dx.doi.org/10.1080/08957950212787.

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15

Haines, Julian, Jean Michel Léger, and Abdeltif Atouf. "Crystal Structure and Equation of State of Cotunnite-Type Zirconia." Journal of the American Ceramic Society 78, no. 2 (1995): 445–48. http://dx.doi.org/10.1111/j.1151-2916.1995.tb08822.x.

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16

Chen, Dong, and Chao Xu. "Computer Simulation of the Magnesium Silicide Polymorphs." Applied Mechanics and Materials 170-173 (May 2012): 3312–15. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3312.

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The anti-cotunnite magnesium silicide was constructed, and its absorption coefficient, dielectric function and loss function have been investigated through the plane-wave pseudo- potential calculations based on the density functional theory. In our scheme, we consider the Mg2Si crystal without defects or cracks. Significant features have been observed for the optical properties in the low-energy region and the high-energy region. The main focus of this paper is to determine the high-pressure optical properties of Mg2Si and find out if this material can be used as high-performance thermoelectric devices.

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17

Zhang, Yan, Li Duan, and Vincent Ji. "The detailed crystal and electronic structures of the cotunnite-type ZrO2." Solid State Communications 239 (July 2016): 27–31. http://dx.doi.org/10.1016/j.ssc.2016.04.014.

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18

Woensdregt, C. F., and P. Hartman. "Structural morphology of cotunnite, PbCl2, laurionite, Pb(OH)Cl, and SbSI." Journal of Crystal Growth 87, no. 4 (1988): 561–66. http://dx.doi.org/10.1016/0022-0248(88)90105-4.

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19

Mahmood, Tariq, Chuanbao Cao, Faheem K. Butt, et al. "Elastic, electronic and optical properties of cotunnite TiO2 from first principles calculations." Physica B: Condensed Matter 407, no. 22 (2012): 4495–501. http://dx.doi.org/10.1016/j.physb.2012.08.006.

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20

Léger, J. M., J. Haines, and A. Atouf. "The Post-Cotunnite Phase in BaCl2, BaBr2 and BaI2 under High Pressure." Journal of Applied Crystallography 28, no. 4 (1995): 416–23. http://dx.doi.org/10.1107/s0021889895001580.

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21

HAINES, J., J. M. LEGER, and A. ATOUF. "ChemInform Abstract: Crystal Structure and Equation of State of Cotunnite-Type Zirconia." ChemInform 27, no. 18 (2010): no. http://dx.doi.org/10.1002/chin.199618001.

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22

Öztürk, Hülya, and Murat Durandurdu. "Formation of Cotunnite Phase in ZrO2 under Uniaxial Stress: A First Principles Study." Journal of the American Ceramic Society 94, no. 3 (2010): 932–37. http://dx.doi.org/10.1111/j.1551-2916.2010.04167.x.

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23

Zhang, Cheng, Yun Yang, Yin Zhang, Jingru Liu, Li You, and Xiping Song. "Precipitation of cotunnite-type zirconia induced by deuterium absorption in Zr-4 alloy." Scripta Materialia 143 (January 2018): 1–4. http://dx.doi.org/10.1016/j.scriptamat.2017.08.001.

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24

PONOMAREV, Vladimir Sergeevich, Yuriy Viktorovich EROKHIN, Kirill Svyatoslavich IVANOV, and Nadezhda Nikolaevna FARRAKHOVA. "Mineralogical and geochemical features of volcanics from the pre-Jurassic basement of the western part of Yamal." NEWS of the Ural State Mining University, no. 4 (December 20, 2020): 103–14. http://dx.doi.org/10.21440/2307-2091-2020-4-103-114.

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Relevance of the work. The Arctic part of the West Siberian megabasin is the main source of oil and gas in Russia, therefore, the study of the geological structure of this region is extremely important. Recently, Russia has lodged an application to extend its territory in the Arctic Ocean along the ridges that stretch from the continental shelf. Unfortunately, at the same time, we know little about the geological structure of the Arctic in the region of Western Siberia, where the thickness of the sedimentary cover is very high (about 3–4 km), therefore, the study of the basement of the Yamal Peninsula seems to be extremely urgent. The purpose of this work is mineralogical, petrological and geochemical study of dolerites from the pre-Jurassic basement of the Bovanenkovskaya area (well No. 114) within the territory of the gas condensate field of the same name, located in the western part of the Yamal Peninsula. Scope of the work. This work can be useful in constructing geological maps of the pre-Jurassic basement of the Yamal Peninsula. Results and conclusions. We have studied the mineralogical and geochemical features of dolerites from the pre-Jurassic basement of the Bovanenkovskaya area (well No. 114, sampling depth – 3210 m) of the West Siberian megabasin. The mineralogy of the rocks is represented by augite, diopside, albite, magnesian chamosite, ferrous hornblende, calcite, siderite, dolomite, anorthoclase, grossular, zeolite (gmelenite-K), pyrite, chalcopyrite, and rare lead chloride – cotunnite. The rocks underwent minor transformations in the conditions of the lower greenschist metamorphism, as well as secondary alterations in the form of superimposed propylitization. As a result of this low-temperature metasomatic process, zeolite, carbonate (calcite, dolomite, and siderite) and sulfide mineralization composed of pyrite and chalcopyrite, as well as cotunnite, which apparently replaced the dissemination of galena, were formed in the rock. Judging by geological position of the region, these dolerites are most likely formed at shallow depths during continental rifting. Remelting of the Paleozoic island arc substrate during the Early Triassic rifting and volcanism provided some closeness to the island arc trend in the geochemical features of these rift volcanics.

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25

Al-Khatatbeh, Yahya, Khaldoun Tarawneh, Hussein Al-Taani, and Kanani K. M. Lee. "Theoretical and Experimental Evidence for a Post-Cotunnite Phase Transition in Hafnia at High Pressures." Journal of Superhard Materials 40, no. 6 (2018): 374–83. http://dx.doi.org/10.3103/s1063457618060023.

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26

Ding, Yingchun, Min Chen, and Wenjuan Wu. "Mechanical properties, hardness and electronic structures of new post-cotunnite phase (Fe2P-type) of TiO2." Physica B: Condensed Matter 433 (January 2014): 48–54. http://dx.doi.org/10.1016/j.physb.2013.10.010.

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27

Nishio-Hamane, Daisuke, Haruhiko Dekura, Yusuke Seto, and Takehiko Yagi. "Theoretical and experimental evidence for the post-cotunnite phase transition in zirconia at high pressure." Physics and Chemistry of Minerals 42, no. 5 (2014): 385–92. http://dx.doi.org/10.1007/s00269-014-0728-3.

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28

Rahman, MM, AJMT Neger, A. Gafur, and ASW Kurny. "Studies on the preparation of lead(II) chloride from galvanizing plant wastes." Bangladesh Journal of Scientific and Industrial Research 47, no. 4 (2013): 415–20. http://dx.doi.org/10.3329/bjsir.v47i4.14071.

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Galvanizing plant wastes containing 71.82% lead was leached in hydrochloric acid. Lead was precipitated from the leach liquor as lead chloride and purified by recrystallisation. The process parameters like concentration of hydrochloric acid, time of leaching, mode of reaction, number of re-crystallization etc. were optimised. Nearly 70% of lead contained by the waste material could be leached out and converted to lead(II) chloride. The product (PbCl2) was characterised by atomic absorption spectroscopy, thermogravimetric analysis, x-ray diffraction analysis, and scanning electron microscopy. Atomic absorption spectroscopic analysis showed that the product was 93% pure. X-ray diffraction analysis confirmed that the product possess cotunnite phase having orthorhombic structure. The needle like shape of the prepared PbCl2 crystal was confirmed by scanning electron microscopy. Physical properties like melting point and density were also very close to those reported in literature. Bangladesh J. Sci. Ind. Res. 47(4), 415-420, 2012 DOI: http://dx.doi.org/10.3329/bjsir.v47i4.14071

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29

Niu, Jingjing, Xiang Wu, Haibin Zhang, and Shan Qin. "Pressure-induced order–disorder transition in Gd 1.5 Ce 0.5 Ti 2 O 7 pyrochlore." Royal Society Open Science 6, no. 9 (2019): 190842. http://dx.doi.org/10.1098/rsos.190842.

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An experimental study on ordered pyrochlore structured Gd 1.5 Ce 0.5 Ti 2 O 7 ( F d 3 ¯ m ) was carried out up to 45 GPa by synchrotron radiation X-ray diffraction and Raman spectroscopy. Experimental results show that Gd 1.5 Ce 0.5 Ti 2 O 7 transfers to a disordered cotunnite-like phase ( Pnma Z = 4) at approximately 42 GPa. Compared with the end member Gd 2 Ti 2 O 7 , the substitution of Ce 3+ for Gd 3+ increases the transition pressure and the high-pressure stability of the pyrochlore phase. This pressure-induced structure transition is mainly controlled by cationic order–disorder modification, and the cationic radius ratio r A / r B may also be effective for predicting the pyrochlore oxides' high-pressure stability. Two isostructural transitions are observed at 6.5 GPa and 13 GPa, and the unit-cell volume of Gd 1.5 Ce 0.5 Ti 2 O 7 as a function of pressure demonstrates its compression behaviour is rather complex.

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30

Dutta, Rajkrishna, Eran Greenberg, Vitali B. Prakapenka, and Thomas S. Duffy. "Phase transitions beyond post-perovskite in NaMgF3 to 160 GPa." Proceedings of the National Academy of Sciences 116, no. 39 (2019): 19324–29. http://dx.doi.org/10.1073/pnas.1909446116.

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Neighborite, NaMgF3, is used as a model system for understanding phase transitions in ABX3 systems (e.g., MgSiO3) at high pressures. Here we report diamond anvil cell experiments that identify the following phases in NaMgF3 with compression to 162 GPa: NaMgF3 (perovskite) → NaMgF3 (post-perovskite) → NaMgF3 (Sb2S3-type) → NaF (B2-type) + NaMg2F5 (P21/c) → NaF (B2) + MgF2 (cotunnite-type). Our results demonstrate the existence of an Sb2S3-type post-post-perovskite ABX3 phase. We also experimentally demonstrate the formation of the P21/c AB2X5 phase which has been proposed theoretically to be a common high-pressure phase in ABX3 systems. Our study provides an experimental observation of the full sequence of phase transitions from perovskite to post-perovskite to post-post-perovskite followed by 2-stage breakdown to binary compounds. Notably, a similar sequence of transitions is predicted to occur in MgSiO3 at ultrahigh pressures, where it has implications for the mineralogy and dynamics in the deep interior of large, rocky extrasolar planets.

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31

Haines, Julian, Jean Michel Léger, Steve Hull, et al. "Characterization of the Cotunnite-Type Phases of Zirconia and Hafnia by Neutron Diffraction and Raman Spectroscopy." Journal of the American Ceramic Society 80, no. 7 (2005): 1910–14. http://dx.doi.org/10.1111/j.1151-2916.1997.tb03073.x.

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32

Caravaca, M. A., J. C. Miño, V. J. Pérez, R. A. Casali, and C. A. Ponce. "Ab initiostudy of the elastic properties of single and polycrystal TiO2, ZrO2and HfO2in the cotunnite structure." Journal of Physics: Condensed Matter 21, no. 1 (2008): 015501. http://dx.doi.org/10.1088/0953-8984/21/1/015501.

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33

Nishio-Hamane, Daisuke, Asa Shimizu, Ritsuko Nakahira, et al. "The stability and equation of state for the cotunnite phase of TiO2 up to 70 GPa." Physics and Chemistry of Minerals 37, no. 3 (2009): 129–36. http://dx.doi.org/10.1007/s00269-009-0316-0.

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34

Al-Khatatbeh, Yahya, Khaldoun Tarawneh, and Ahmad M. Alsaad. "Prediction of a Reentrant Phase Transition Behavior of Cotunnite in Zirconia and Hafnia at High Pressures." Journal of Superhard Materials 45, no. 1 (2023): 10–19. http://dx.doi.org/10.3103/s1063457623010021.

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35

Haines, J., J. M. Léger, and O. Schulte. "The high-pressure phase transition sequence from the rutile-type through to the cotunnite-type structure in." Journal of Physics: Condensed Matter 8, no. 11 (1996): 1631–46. http://dx.doi.org/10.1088/0953-8984/8/11/009.

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36

HAINES, J., J. M. LEGER, S. HULL, et al. "ChemInform Abstract: Characterization of the Cotunnite-Type Phases of Zirconia and Hafnia by Neutron Diffraction and Raman Spectroscopy." ChemInform 28, no. 42 (2010): no. http://dx.doi.org/10.1002/chin.199742006.

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37

Pohlmann, Jared, Manjula Raman, Lily Bonds, and Kenneth Park. "The Stability of TiO2 Phases Studied Using r2SCAN in the Hubbard-Corrected Density Functional Theory." Molecules 30, no. 3 (2025): 560. https://doi.org/10.3390/molecules30030560.

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Titanium dioxide is a quintessential transition metal oxide with many technologically important applications. With its richness in phases, it has also been a testing ground for numerous theoretical studies including density functional theory. We investigated several phases of TiO2 using the all-electron density functional theory with a regularized–restored strongly constrained appropriately normed (r2SCAN) exchange–correlation functional, a popular choice of meta-generalized gradient approximation (meta-GGA). Specifically, the equilibrium lattice parameters were more accurate than those predicted by GGA and agreed well overall with the experimental data. With increasing pressure, the order of stability was determined as anatase < columbite < rutile < baddeleyite < orthorhombic I < cotunnite, as in the calculations using GGA. Including the Hubbard correction term, the correct ordering between rutile, anatase, and columbite can be achieved, consistent with experimental observations. The necessary U value using r2SCAN is much smaller than that using GGA+U. In addition, the Hubbard correction method using r2SCAN is substantially less sensitive to the size of the local projection space compared to the GGA+U study reported recently. We attribute these significantly improved results to the reduced self-interaction error in the r2SCAN functional.

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38

Kalita, Pat, Paul E. Specht, Justin L. Brown, Lena M. Pacheco, Josh M. Usher, and Christopher T. Seagle. "Real-Time Atomic Scale Kinetics of a Dynamic Event in a Model Ionic Crystal." Minerals 13, no. 9 (2023): 1226. http://dx.doi.org/10.3390/min13091226.

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The mineral CaF2 is the archetype of the α fluorite structure and its high-pressure phase transition to γ cotunnite is an ideal test bed for exploring the effects of kinetics. The inter-disciplinary topic of the kinetics of dynamically driven phase transitions is at the forefront of condensed matter physics, both for its theoretical importance and its relevance to technological applications at extreme conditions of pressure and temperature. Here we probe the α → γ → α structural transformations taking place over the nanosecond timescale of a dynamic event, beginning-to-end: from the principal shock Hugoniot state, followed by a quasi-steady off-Hugoniot release state, and finally the unsteady return to near-ambient conditions. We present quantitative, atomic-scale data of the unfolding of the dynamically driven phase transition and its subsequent reversal close to the α/γ phase boundary. Dynamic loading with a two-stage gas gun is coupled with in situ time-resolved synchrotron X-ray diffraction and with continuum scale velocimetry at the Dynamic Compression Sector (DCS), Advanced Photon Source, Argonne National Laboratory. Our results demonstrate the time dependence of phase transitions and highlight the need for modeling of transition kinetics in dynamically driven processes.

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39

Mirgorodsky, Andrei P., and Pierre E. Quintard. "Lattice-Dynamic Treatment of Vibrational and Elastic Properties of Cotunnite-Type ZrO2 and HfO2: Comparison with Ambient Pressure Polymorphs." Journal of the American Ceramic Society 82, no. 11 (2004): 3121–24. http://dx.doi.org/10.1111/j.1151-2916.1999.tb02211.x.

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40

D’yachkov, Boris A., Ainel Y. Bissatova, Marina A. Mizernaya, et al. "Mineralogical Tracers of Gold and Rare-Metal Mineralization in Eastern Kazakhstan." Minerals 11, no. 3 (2021): 253. http://dx.doi.org/10.3390/min11030253.

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Replenishment of mineral resources, especially gold and rare metals, is critical for progress in the mining and metallurgical industry of Eastern Kazakhstan. To substantiate the scientific background for mineral exploration, we study microinclusions in minerals from gold and rare-metal fields, as well as trace-element patterns in ores and their hosts that may mark gold and rare-metal mineralization. The revealed compositions of gold-bearing sulfide ores and a number of typical minerals (magnetite, goethite, arsenopyrite, antimonite, gold and silver) and elements (Fe, Mn, Cu, Pb, Zn, As, and Sb) can serve as exploration guides. The analyzed samples contain rare micrometer lead (alamosite, kentrolite, melanotekite, cotunnite) and nickel (bunsenite, trevorite, gersdorffite) phases and accessory cassiterite, wolframite, scheelite, and microlite. The ores bear native gold (with Ag and Pt impurities) amenable to concentration by gravity and flotation methods. Multistage rare-metal pegmatite mineralization can be predicted from the presence of mineral assemblages including cleavelandite, muscovite, lepidolite, spodumene, pollucite, tantalite, microlite, etc. and such elements as Ta, Nb, Be, Li, Cs, and Sn. Pegmatite veins bear diverse Ta minerals (columbite, tantalite-columbite, manganotantalite, ixiolite, and microlite) that accumulated rare metals late during the evolution of the pegmatite magmatic system. The discovered mineralogical and geochemical criteria are useful for exploration purposes.

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41

Zhu, Bo, Hai Sheng Ren, Jun Zhu, et al. "The structural, elastic and thermodynamic properties of the cotunnite-type phase of Hafnia under high pressure from first-principles calculations." Physica B: Condensed Matter 406, no. 13 (2011): 2501–8. http://dx.doi.org/10.1016/j.physb.2011.03.036.

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42

Akaogi, Masaki, Saki Hashimoto, and Hiroshi Kojitani. "Thermodynamic properties of ZrSiO4 zircon and reidite and of cotunnite-type ZrO2 with application to high-pressure high-temperature phase relations in ZrSiO4." Physics of the Earth and Planetary Interiors 281 (August 2018): 1–7. http://dx.doi.org/10.1016/j.pepi.2018.05.001.

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Kucha, Henryk Harry. "New minerals and the first mineral occurrences in the Kupferschiefer (U, REE, HgS, chloride minerals PtAs₂, Pt(Sb,Bi)₂, PtBi₂), Poland, and their genetic meaning." Mineralogia 52, no. 1 (2021): 31–42. http://dx.doi.org/10.2478/mipo-2021-0004.

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Abstract Main U minerals in the Lubin and Polkowice mines in decreasing order of abundance are: uraninite, brannerite, metazunerite, metauranospinite, uranospinite, thucholite, monazite-huttonite, coffinite, and becquerelite. All these minerals are associated mainly with noble metal mineralization at the redox interfaces. Main minerals of REE are: (i) brannerite, monazite-huttonite in Noble Metals Bearing Shale (NMBS), (ii) florencite in Mo-Re shales and (iii) minor phospates in Cu-black shales derived from oxidation of organic matter. The latter, however, are controlling no more than 1/5 of the REE budget. Chloride minerals and sulphates are ubiquitous phases associated with Cu sulphides. They are represented by chlorargylite, cotunnite and penfieldite. Halite and sylvite form cubic inclusions in gypsum, up to 3 mm in chevrel compound, where they occur together with thiosulphates, anna-bergite and erithrite and Ni-Co-diarsenides. Sylvite is most common in lensoidal accumulations of semi massive kaolinite + chalcocite + gypsum at the contact between black shale and the top part of white sandstone. Such lenses have been traced over a distance of up to 30 m in the Lubin West and Polkowice East mines. Sylvite and halite have been so far overlooked during investigations of the Kupferschiefer because of applying standard cuƫng and polishing procedures using water as a lubricant. The Au content in native gold may reach exceptionally up to 97.40 wt% in a dolomitic reef from the Lubin West Mine. Gold forms four characteristic micro to nano-textures. Organic matrix of thucholite indicates correlation of Pt-Ni-V suggesting substitution of Pt in tetrapyrrole ring. Sperrylite, geversite and insizwaite appear at the western perimeter of Cu-sulphide deposit, where the redox gradient is so strong that almost all organic matter is gone. Platinum has forms its own minerals trapped in microfractures in anilite-digenite-spionkopite-yarrowite-bornite composite grains present in the reddened NMBS. Celestine-barite solid solution is one of the main accessory minerals in the Kupferschiefer. It has Sr/Ba ratio around 2.5 and 7.5. Euhedral uraninite associated with celestine-barite yielded U/Pb age of 84 ± 1 Ma, based on four grains measurements.

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Di Ieva, Antonio, and M. Gazi Yaşargil. "LIQUOR COTUNNII." Neurosurgery 63, no. 2 (2008): 352–58. http://dx.doi.org/10.1227/01.neu.0000320438.99843.9f.

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Draca, Sanja. "Foreign scientists on the contribution of Serbian physician and scientist dr. Lazar K. Lazarevic to medical science." Srpski arhiv za celokupno lekarstvo 144, no. 1-2 (2016): 111–15. http://dx.doi.org/10.2298/sarh1602111d.

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Dr. Lazar K. Lazarevic (1851-1890, Julian calendar / 1891, Gregorian calendar) was an exceptional Serbian physician, scientist, writer and translator. During his short life and his close to 11-year-long professional career (1879-1890), Dr. Lazarevic authored 78 scientific papers and presentations in various branches of medicine. His greatest contribution to the field of neurology and to medical science in general is his description of the straight leg raising test. The article titled ?Ischiac postica Cotunnii - One contribution to its differential diagnosis? was published in the Serbian language (in Cyrillic alphabet) in the Serbian Archives of Medicine in 1880. The article was translated to German and republished in Vienna in 1884 in Allgemeine Wiener medizinische Zeitung. The straight leg raising test is usually called Las?gue?s test/sign, after the French clinician Charles Las?gue, although he never described it. However, there are numerous authors who admit that Las?gue never published the description of the straight leg raising test, and instead give full credits for its discovery to Dr. Lazarevic. Our objective in this article is to highlight the major literature written by foreign scientists who give credit to Dr. Lazarevic for his contribution to medical science.

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Weck, Philippe F., and Eunja Kim. "Shock compression of crystalline TeO2 to the high-pressure fluid regime: Insights from ab initio molecular dynamics simulations." Journal of Applied Physics 136, no. 18 (2024). http://dx.doi.org/10.1063/5.0235106.

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The shock response of fully-dense and porous crystalline tellurium dioxide (TeO2) to the high-pressure and high-temperature fluid regime was investigated within the framework of density functional theory with Mermin’s generalization to finite temperatures. The principal and porous shock Hugoniot curves were predicted from canonical ab initio molecular dynamics (AIMD) simulations, with the phase space sampled along isotherms up to 80 000 K, for densities ranging from ρ=3 to 17 g/cm3. The polymorphs investigated are α-TeO2 paratellurite (P41212), TeO2 cotunnite (Pnma), and TeO2 post-cotunnite (P21/m). Based on the discontinuity found in the calculated Us−up slope of TeO2 post-cotunnite at a shock velocity of Us≃8.35 km/s and a particle velocity of up≃3.64 km/s, the shock melting temperature and pressure are predicted to be ≃6500 K and ≃170 GPa. Results from the AIMD simulations are in line with the static compression data of TeO2 paratellurite and cotunnite, and with the recent shock Hugoniot data for single-crystal α-TeO2 for pressures up to 85 GPa, obtained using the inclined-mirror method and the velocity interferometer system for any reflector combined with powder gun and two-stage light-gas gun.

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Dewhurst, J. K., and J. E. Lowther. "Highly coordinated metal dioxides in the cotunnite structure." Physical Review B 64, no. 1 (2001). http://dx.doi.org/10.1103/physrevb.64.014104.

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"A cotunnite-type new high-pressure phase of Fe2S." American Mineralogist, September 1, 2021. http://dx.doi.org/10.2138/am-2022-7959.

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OHTAKA, O., S. KUME, and E. ITO. "ChemInform Abstract: Synthesis and Phase Stability of Cotunnite-Type Zirconia." ChemInform 19, no. 52 (1988). http://dx.doi.org/10.1002/chin.198852021.

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Shojaee, E., M. Abbasnejad, M. Saeedian, and M. R. Mohammadizadeh. "First-principles study of lattice dynamics ofTiO2in brookite and cotunnite structures." Physical Review B 83, no. 17 (2011). http://dx.doi.org/10.1103/physrevb.83.174302.

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