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Showing 1 to 19 of 19 for “"unit-cell parameters"”.
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Measurements of Unit Cell Parameters of Three Pd-Complexes
No abstract prepared.
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K, Na distribution and unit cell parameters of alkali feldspars.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Pegmatitic muscovites: effect of composition on optical and lattice parameters
… with both the optical properties and the unit cell parameters. The results of this study indicate refractive indices increase to the extent Fe and Ti constitute the octahedral cations, and to the extent OH rather than F coordinates to these cations. The optic angle 2VX decreases nearly …
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Cell parameter systematics of the binary silicate olivines: methods for the determination of composition and intracrystalline cation ordering
… used to determine the relationship between the unit cell parameters and the average radii, rM1 and rM2, of the octahedral cations in Fe-Mn, Ni-Fe, Mg-Mn, and Mg-, Fe-, and Mn-Ca binary olivines, using data from the literature. The resulting regression equations are given below. The coefficients …
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Determining the lon-exchange Mechanism of Strontium into a Niobium Doped Titanosilicate
… of the atomic positions of the ions and unit cell parameters as strontium occupancy increases.</p> <p>The starting material of the exchange experiment is the protonated phase, H2Nb0.67Ti1.33SiO7·1.9 H2O, with space group P42/mcm2,3. Once strontium (Sr2+) enters the unit cell, …
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The crystal and molecular structure of thiamine hydroiodide /|nWilliam Edward Lee. -- 260 St. Catharines [Ont.] : Dept. of Chemistry, Brock University,
… has been determined. The unit cell parameters are a = 13.84 ± 0.03, o b = 7.44 ± 0.01, c = 20.24 ± 0.02 A, 8 = 120.52 ± 0.07°, space group P2/c, z = 4. A total of 1445 reflections having ,2 > 2o(F2), 26 < 40° were collected on a Picker four-circle diffractometer with MoKa …
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Excess Volume and Exsolution in Pyrope-Grossular Garnet
X-ray diffraction (XRD) was used to measure the unit cell parameters of pyrope (Mg₃Al₂Si₃O₁₂), grossular (Ca₃Al₂Si₃O₁₂) and four intermediate solid solutions synthesized at ~6 GPa and 1400°C in multi-anvil (MA) apparatus. Intermediate garnet solid solutions on this join show regular asymmetric …
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Mechanisms of Microbial DNA Sensing by the AIM2 Inflammasome and Structural Study of Polynucleotydyl Transferase1 (pnt1) from Arabidopsis Thaliana
… cubic space group I23 or I213 with almost same unit-cell parameters. Mutagenesis of HIN-200 domain of mouse AIM2 and DNA binding studies revealed amino acid residues involved in DNA binding. These residues were compared with dsDNA binding residues identified from the structure of HIN-200 domains …
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Iron-magnesium amphiboles: synthesis and stability with respect to temperature, pressure, oxygen fugacity, and sulfur frugacity
… are optically orthorhombic. Variation of unit cell parameters with composition suggests that they are members of a single, continuous solid solution. (a(Å) = 18.577(12) + 0.001284(190)X<sub>Fe</sub>, b(Å) = 17.942(11) + 0.004862(170)X<sub>Fe</sub>, c(Å) = 5.285(3) + …
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Resorption rate tunable bioceramic: Si,Zn-modified tricalcium phosphate
… of a secondary phase. Changes in lattice parameters and unit volume of TCP as calculated by Rietveld analysis indicate that Si and Zn substitute for P and Ca respectively. Analysis of neutron powder diffraction data confirmed that 10% Si and Zn doped TCP has a rhombohedral structure (space …
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Anion manipulation in perovskite-related materials
… synthesised via quenching, with the orthorhombic unit cell parameters \(a\) = 5.4639(3) Å, \(b\) = 15.6486(8) Å and \(c\) = 5.5667(3) Å based on refinement of NPD data collected at 4K. Electron microscopy revealed L R L R intralayer ordering of chain orientations which requires a doubling of the …
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The Elastic Behavior of Plagioclase Feldspar at High Pressure
Feldspars are one of the archetypical families of framework silicates. They not only comprise around 60% volumetrically of the Earth's crust, but are among some of the most structurally complicated minerals. Investigation into the structural behavior of various intermediate plagioclases at pressure …
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Structural studies of layered transition metal oxides
… that are described by a<br/>2a0 2a0 x c supercell model in the space group P42/mnm rather than the idealised<br/>Sr3Ti2O7 I4/mmm structure as previously reported. A structural transition at ~ 580 K is<br/>characterised by reduction in the unit cell symmetry and distortion of CoO6 octahedra; …
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Crystal chemistry of the humite minerals
… Fe, Mn, and Ca for Mg has the same effect on the unit cell volume (normalized to half the mean anion-anion distance along the normal to (001)) in minerals with the humite structure as it does in minerals with the olivine structure. Fifty-five humite mineral samples have been analyzed by microprobe …
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Physicochemical characterisation of cyclodextrin-drug complexes
… (TRIMEB). The unit cell parameters of thirteen cyclodextrin-drug complexes and of TRIMEB monohydrate were determined by X-ray photography and the cry tal structures of six of these complexes and of TRIMEB monohydrate were solved. The water content of the …
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Magnesium-manganese solid solution in the olivine and humite groups
… the number of fluorine atoms per formula unit times the number to monovalent ligands associated with the octahedron. <M(1)-0> = 1.445 + 0.9172 <r<sub>M(1)</sub>> <M(2)-(O,OH,F)> = 1.541 + 0.8185 <r<sub>M(2)</sub>> - 0.01649 f <M(3)-(O,OH,F)> = 1.502 + 0.8386 <r<sub>M(3)</sub>> - 0.02122 f …
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Synthesis and investigation of boron phases at high pressures and temperatures
… crystallizes in a R-3m space group with the unit cell parameters a = 5.5940(7) Å and c = 12.0756(16) Å (in hexagonal setting). The unit cell contains 15 boron atoms. The structure can be presented by the network of B12 icosahedra with a group of three boron atoms in the inter-icosahedra …
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Single-crystal X-ray diffraction at extreme conditions in mineral physics and material sciences
… phases, determine a crystal structure (unit cell parameters, a space group, atomic coordinates and atomic occupancies) and, if required, a phase composition. This thesis deals with applications of single-crystal XRD in high pressure and high temperature (HPHT) research using laser-heated …
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The Chemistry and Crystallography of Doped Bixbyite, Braunite and Novel Anion-Deficient Fluorite Oxides
… to the frequently overlooked atomic displacement parameters which appear to be anharmonic in nature. This observation appears not to be unique to Cu3TeO6 but rather is present in most bixbyites likely due to a small rattling type behaviour. Powders of the solid-solution Cu3-0.75xTe1-xSbxO6-0.125x …