Results 161 to 170 of about 3,477 (195)

Dielectric properties of iron-bearing trioctahedral phyllosilicates

Physics and Chemistry of Minerals, 1997
Measurements of the real part of conductivity (σ′) and dielectric function (ɛ′) were performed on large crystal flakes of biotite (Moen) and vermiculite (Benahavis), at variable frequencies (0.1 to 1000 kHz) and as a function of temperature (300 ...
Claus H. Rüscher, Stefan Gall
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Eu(III) coprecipitation with the trioctahedral clay mineral, hectorite

Clays and Clay Minerals, 2006
AbstractVarious secondary phases formed during alteration/dissolution of HLW (high-level nuclear waste) borosilicate glass represent a significant retention potential for radionuclides including divalent actinides. The trioctahedral smectite, hectorite, Na0.7[Li0.7Mg5.3Si8O20(OH)4], is one of the secondary phases identified within the alteration layer ...
Pieper, H., Bosbach, D., Panak, P. J., Rabung, T., Fanghänel, T.   +4 more
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Empirical Raman calibration of trioctahedral ferromagnesium chlorite minerals

Journal of Raman Spectroscopy, 2023
AbstractChlorite is a common hydrated‐aluminous phyllosilicate mineral group that forms in most geological environments (e.g., hydrothermal, igneous, sedimentary, and metamorphic). The chemical composition of chlorite depends on several factors including temperature, pressure, fluid, and bulk rock composition.
Sarah N. Lamm, Brice Lacroix, C. P. Marshall, Abdeltif Lahfid, Patrick J. Gasda, Pamela D. Kempton, Vincent Trincal, Martine Buatier, Pierre Lanari, Torsten Vennemann   +9 more
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Hydrothermal Synthesis of Low Layer Charge Trioctahedral Smectite

2021
Smectites are widely used in (geo-) technical applications and are important components of soils. A definition gap exists between the uncharged non-swellable pyrophyllite and talc ( = 0) and the low charged swellable clay minerals (smectites) with 0.2 0.6. Furthermore, no reliable measurement method exists for < 0.2.
Yi-Yu , Liu , Schewe , Nils , Thissen , Peter , Emmerich , Katja   +3 more
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Rational design and synthesis of excavated trioctahedral Au nanocrystals

Nanoscale, 2015
Excavated polyhedral nanostructures, possessing the features of high surface area and well-defined surface structure with a specific crystal facet and avoidance of aggregation, could be one of the best choices for the purpose of reducing consumption and improving performance of noble metals in many application fields.
Qiaoli, Chen, Yanyan, Jia, Wei, Shen, Shuifen, Xie, Yanan, Yang, Zhenming, Cao, Zhaoxiong, Xie, Lansun, Zheng   +7 more
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Salt Displacement of Acid‐Treated Trioctahedral Vermiculites

Soil Science Society of America Journal, 1967
Abstract Freshly prepared and 30‐day‐aged samples of HCl‐treated trioctahedral vermiculites from Libby, Montana (L) and northeastern Transvaal, South Africa (S) were leached with 1 N or more dilute solutions of NaCl, KCl, CaCl 2 , or ...
Malek T. Kaddah, N. T. Coleman
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Oxidation rates and redox stabilization of ferrous iron in trioctahedral smectites

Geochimica et Cosmochimica Acta, 2023
Iron(II)-bearing trioctahedral smectites (saponites) form during anoxic alteration of basaltic rock. They are predicted to have been widespread on the early Earth and are observed in the oceanic subsurface today. Smectite structures, including the occupancy of sites in the octahedral sheet, affect iron redox behavior but the rates and products of ...
Robert J. Kupper, Nanqing Zhou, Clara S. Chan, Aaron Thompson, Jeffrey G. Catalano   +4 more
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Dielectric Properties of a Di-trioctahedral Chlorite: Cookeite

Transactions of the Indian Ceramic Society, 1988
Temperature and frequency variations of the dielectric constant (K), loss (tan δ) and conductivity of a di-trioctahedral chlorite (cookeite) were measured in the temperature range 30°—400°C and frequency range 102—107 kHz. The variational patterns of these parameters of cookeite have been compared with those of ripidolite, a tri-trioctahedral chlorite ...
S. Lokanatha, A. K. Datta, S. Bhattacherjee   +2 more
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Compositions of trioctahedral micas in the Cornubian batholith

Mineralogical Magazine, 1988
AbstractNew major and trace element chemical analyses of trioctahedral micas of the Cornubian batholith emphasize their enrichment in a ‘trace-alkali element’ association (Li, Rb, Cs, F, Nb, Mn) and their deficiency in a ‘femic element’ association (Zr, Ce, Th as well as Mg and Ti) compared with micas from many other granite suites, although there are ...
M. Stone, C. S. Exley, M. C. George
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Biotites Intermediate Between Dioctahedral and Trioctahedral Micas

Clays and Clay Minerals, 1967
AbstractOrange-yellow detrital flakes of biotite are common carriers of potassium and trace elements in soils and clays. Because the flakes differ in degree of alteration and may be derived from different sources, it is difficult to obtain homogeneous material for studies of their physical and chemical properties that may be compared with the original ...
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