搜索结果: 61-74 共查到“理学 ordering”相关记录74条 . 查询时间(0.063 秒)
Cation ordering in lead-molybdenum-vanadium oxychlorides
Cation lead-molybdenum-vanadium oxychlorides
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2012/4/9
The crystal chemistry and structure ofthe layered lead oxychloride parkinsonite, ideally Pb7Mo09C12, have been reevaluated in the light of TEM observations of natural and syn-thetic samples and the st...
Displacive phase transition in anorthoclase: The "plateau effect" and the effect of T1-T2 ordering on the transition temperature
Displacive phase transition anorthoclase plateau effect T1-T2 transition temperature
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2012/4/9
The effects of compositional changes and nonsymmetry-breaking AI-Siordering onthe displacive phase transition in anorthoclase have been studied using X-ray powder diffrac-tion. The results wereanalyze...
Pressure induced ordering in (Ni,Mg)2SiO4 olivine
Pressure (Ni,Mg)2SiO4 olivine
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2012/4/9
An imaging-plate detector interfaced to a large-volume high-pressure device allows quantitative in situ powder X-ray diffraction measurements at the National Synchrotron Light Source (NSLS). High-qual...
Two-site multi-cation ordering-disordering in minerals: An alternative kinetic model
Two-site multi-cation ordering-disordering minerals kinetic model
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2012/4/6
Mueller'smodelhasbeenwidelyapplied to modelingkineticexperimental data onthe ordering-disordering ofcations betweentwo nonequivalent sites.Thismodelis validonly for pure ornearly purebinary systems. F...
Magnetic properties of the magnetite-spinel solid solution: Curie temperatures, magnetic susceptibilities, and cation ordering
Magnetic properties magnetite-spinel solid solution Curie temperatures magnetic susceptibilities cation ordering
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2012/4/5
Curietemperatures (Td ofthe (Fe304)x(MgA1204)1-xsolid solution have been deter-minedfrom measurementsofmagneticsusceptibility (x)vs.temperature. Thetrend in Te
vs.composition extrapolates to 0Katx =0...
The phenomenon of low Al-Si ordering temperatures in aluminosilicate framework structures
phenomenon Al-Si ordering temperatures aluminosilicate framework structures
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2012/4/5
The enthalpy ofordering ofAland Sibetween tetrahedral sites in framework structures is now known from several studies to bein the range 0.3-1.4 eVper two Al-O-Si linkages, depending on the structure a...
Ordering of the stacking sequence in cookeite with increasing pressure: An HRTEM study
Ordering stacking sequence cookeite increasing pressure HRTEM study
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2012/4/5
To explore the effect of pressure on the stacking-sequence of the chlorite cookeite, a systematic TEM study ofstacking microstructures has been conducted onnatural samples from pegmatitic and metamorp...
Fe ordering in kaolinite: Insights from 29Si and 27Al MAS NMR spectroscopy
Fe ordering kaolinite Insights 29Si 27Al MAS NMR spectroscopy
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2012/4/5
Kaolinite-richsamples wereselectedfor 27 Aland 29SiMASNMRstudy to explore the effectofFeontheir spectraandprovide insight into the nature ofFeorderingin kaolinite. Initial characterization bychemicala...
hk-Ordering in Aluminous Nontronite and Saponite Synthesized Near 90°C: Effects of Synthesis Conditions on Nontronite Composition and Ordering
Beidellite Electron diffraction High-resolution electron microscopy hk-order Lattice imaging Layer stacking Nontronite Nontronite synthesis Saponite
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2011/12/28
In studies on the fate of aluminium in the environment, nontronite and saponite have been obtained by synthesis in reducing alkaline conditions close to those prevailing in poorly drained soils develo...
Magnetic Ordering at 4.2 and 1.3 K in Nontronites of Different Iron Contents: A 57Fe M鰏sbauer Spectroscopic Study
Interlayer site Iron Magnetic ordering Mossbauer spectroscopy Nontronite Octahedral site Tetrahedral site
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2012/1/11
The 57Fe M鰏sbauer spectra of six nontronite samples were measured at appropriate temperatures of 4.2 and 1.3 K. Three of the nontronites gave a complex magnetic hyperfine spectrum showing magnetic ord...
Review of Cation Ordering in Micas
Cation ordering Lepidolite Margarite Mica Muscovite Paragonite Phengite
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2012/2/2
Long-range ordering of tetrahedral cations in micas is favored by phengitic compositions, by the 3T stacking sequence of layers, and by tetrahedral Si:Al ratios near 1:1. Phengites of the 1M, 2M1, and...
Mossbauer, Thermomagnetic, and X-Ray Study of Cation Ordering and High-Temperature Decomposition in Biotite
Biotite Ferrispinel Mossbauer spectra Oxybiotite Thermal decomposition Thermomagnetism
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2012/2/9
To explain the large values of the quadrupole splittings and line widths in the M鰏sbauer spectrum of oxybiotite, a formalized analysis of the distribution of effective charges in the anion network was...
Cation Ordering Pattern in Amesite
Amesite Antarctica Cation Ordering Twinning
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2012/2/10
Cation ordering in amesite-2H2 from Antarctica has reduced the true symmetry from the ideal hexagonal space group P63 to triclinic P1. All crystals show 6-fold biaxial twin sectors on (001), and the t...
The Ordering of Cetylpyridinium Bromide on Vermiculite
Adsorption Cetylpyridinium Exchange Interlayer Superlattice Vermiculite
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2012/2/10
X-ray superlattice reflections, infrared spectroscopy, and chemical analyses have established that cetylpyridinium bromide (CPB) is highly ordered when adsorbed on vermiculite. The molecules, which st...