On the new mineral theophrastite, a nickel hydroxide, from Unst, Shetland, Scotland

1982 ◽  
Vol 46 (338) ◽  
pp. 1-5 ◽  
Author(s):  
A. Livingstone ◽  
D. L. Bish
Keyword(s):  
Solid Solution ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Nickel Hydroxide ◽  
New Mineral ◽  
Solid Solution Series ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Solution Series ◽  
Physical Data

AbstractThe new mineral theophrastite, Ni(OH)2, from Unst, is Mg-bearing and occurs associated with a very poorly crystalline Ni-containing mixed hydroxide of the pyroaurite type and/or zaratite on chromitite. X-ray powder diffraction data show a shift in d spacing toward brucite compared with pure Ni(OH)2. Infrared, thermal, chemical, optical, and physical data are presented together with indexed powder data for fifteen lines ranging from d 4.66Å to 0.90Å. The solid-solution series brucite-theophrastite is briefly discussed.

Rietveld refinement of the solid-solution series: (Cu,Mg)SO4·H2O

1995 ◽  
Vol 10 (3) ◽  
pp. 189-194 ◽  
Author(s):  
C. L. Lengauer ◽  
G. Giester
Keyword(s):  
Solid Solution ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Rietveld Method ◽  
Structure Refinement ◽  
Solid Solution Series ◽  
Cation Site ◽  
Tg Analysis ◽  
X Ray ◽  
Solution Series

The kieserite-type solid-solution series of synthetic (Cu,Mg)SO4·H2O was investigated by TG-analysis and X-ray powder diffraction using the Rietveld method. Representatives with Cu≥20 mol% are triclinic distorted () analogous to the poitevinite (Cu,Fe)SO4·H2O compounds. Cation site ordering with preference of Cu for the more distorted M1 site was additionally proven by the structure refinement.

Brianyoungite, a new mineral related to hydrozincite, from the north of England orefield

1993 ◽  
Vol 57 (389) ◽  
pp. 665-670 ◽  
Author(s):  
A. Livingstone ◽  
P. E. Champness
Keyword(s):  
Thermogravimetric Analysis ◽  
Electron Diffraction ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Empirical Formula ◽  
New Mineral ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Cell Parameters ◽  
The North

AbstractBrianyoungite, which is chemically and structurally related to hydrozincite, occurs as white rosettes (<100 μm) with gypsum on rubbly limestone within the oxidised zone at Brownley Hill Mine, Nenthead, Cumbria. The mineral contains (wt.%) 71.47 ZnO, 9.90 CO2, 6.62 SO3 and 10.70 H2O+. Based on 29 oxygen atoms, the empirical formula is Zn11.73[(CO3)3.00,(SO4)1.10]4.10(OH)15.88 or ideally Zn3(CO3,SO4)(OH)4. Brianyoungite is either orthorhombic or monoclinic with β very close to 90° Cell parameters determined by electron diffraction and refined from X-ray powder diffraction data are a = 15.724, b = 6.256 and c = 5.427 Å. Density is > 3.93, < 4.09 g/cm3 (meas.) and 4.11 g/cm3 (calc.); Z = 4. Thermogravimetric analysis, IR and XRD powder data (23 lines) are presented.

A Review of the XRD Data of the Phases Present in the CaO-SrO-CuO System

1992 ◽  
Vol 7 (3) ◽  
pp. 142-148 ◽  
Author(s):  
Brian J. Reardon ◽  
Camden R. Hubbard
Keyword(s):  
Solid Solution ◽  
Ternary System ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Solid Solution Series ◽  
Powder Diffraction File ◽  
Reference Pattern ◽  
X Ray ◽  
Solution Series ◽  
Xrd Patterns

AbstractX-ray powder patterns for the phases in the CaO-SrO-CuO ternary system, along with the corresponding crystal structures, were obtained from the literature and from the Powder Diffraction File. Available XRD patterns were compared with each other and with a calculated pattern for each phase, yielding a recommended reference pattern. The simulated powder patterns presented here deal with the phases found within the (Ca,Sr)O, (Ca,Sr)2CuO3, (Ca,Sr)14Cu24O41, (Ca,Sr)CuO2, (Ca,Sr)Cu2O3, and (Ca,Sr)Cu2O2 solid solution series and are recommended for the Powder Diffraction File (PDF).

Investigation of (Sr4−δCaδ)PtO6 using X-ray Rietveld refinement

1999 ◽  
Vol 14 (3) ◽  
pp. 181-189 ◽  
Author(s):  
W. Wong-Ng ◽  
J. A. Kaduk ◽  
R. A. Young ◽  
F. Jiang ◽  
L. J. Swartzendruber ◽  
...  
Keyword(s):  
Solid Solution ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Solid Solution Series ◽  
X Ray ◽  
Cell Parameters ◽  
Solution Series ◽  
Complete Solid Solution ◽  
Ca Ions ◽  
Diffraction Patterns

The structures of the solid solution series (Sr4−δCaδ)PtO6, with δ=0, 0.85(1), 2, and 3, have been investigated using the Rietveld refinement technique with laboratory X-ray powder diffraction data. A complete solid solution between Sr and Ca was confirmed to exist. These compounds crystallize in the rhombohedral space group R3¯c. The cell parameters of the series range from a of 9.4780(3) to 9.7477(1) Å, and c from 11.3301(4) to 11.8791(1) Å for δ from 3 to 0, respectively. The structure consists of chains of alternating trigonal prismatic (Sr, Ca)O6 and octahedral PtO6 units running parallel to the c axis. These chains are connected to each other via a second type of (Sr, Ca) ions, which are surrounded by eight oxygens, in a distorted square antiprismatic geometry. As Ca replaced Sr in Sr4PtO6, it was found to substitute preferentially in the smaller octahedral (Sr, Ca)1 site (6a) rather than at the eight-coordinate (Sr, Ca)2 site (18e). There appears to be an anomaly of cell parameters a and c at the compound Sr3.15Ca0.85PtO6. Their dependence on Ca content changes at δ≈1.00, where the Ca has fully replaced Sr in the 6a site. The substitution of Sr by Ca reduced the average (Sr, Ca)1–O length from 2.411 to 2.311 Å and (Sr, Ca)2–O from 2.659 to 2.570 Å as the composition varied from Sr4PtO6 to SrCa3PtO6. Reference X-ray powder diffraction patterns were prepared from the Rietveld refinement results for these members of the solid solution series. Magnetic susceptibility measurements of three of the samples (δ=0, 0.85, 2) show electronic transitions at low temperatures.

Tungusite: new data, relationship with gyrolite and structural model

1995 ◽  
Vol 59 (396) ◽  
pp. 535-543 ◽  
Author(s):  
Giovanni Ferraris ◽  
Alessandro Pavese ◽  
Svetlana V. Soboleva
Keyword(s):  
Solid Solution ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Structural Model ◽  
Substitutional Solid Solution ◽  
Chemical Analyses ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Tetrahedral Layer ◽  
The Ideal

AbstractNew chemical analyses, electron and X-ray powder diffraction data, and comparison with gyrolite and reyerite show that tungusite has the ideal formula , symmetry P and a = 9.714(9), b = 9.721(9), c = 22.09(3), α = 90.13(1)°, β = 98.3(2)°, γ = 120.0(1)°, Z = 1. A structural model for tungusite is derived by splitting the double tetrahedral layer of reyerite and inserting a trioctahedral X sheet which is ideally occupied by Fe2+. Polytypism phenomena due to different relative positions between tetrahedral and X sheets are discussed. A substitutional solid solution represented by the formula [Ca14(OH)8]Si24−yAlyO60[NaxM9−(x+z)□z(OH)14−(x+y+2z)·(x+y+2z)H2O] includes tungusite (x = y = z = 0, M = Fe2+ and gyrolite (x = 1, y = 1, z = 6, M = Ca).

Subsolidus phase relations in La2O3–Bi2O3–CuO

1999 ◽  
Vol 14 (4) ◽  
pp. 274-275 ◽  
Author(s):  
X. L. Chen ◽  
W. Eysel
Keyword(s):  
Solid Solution ◽  
Ternary System ◽  
Powder Diffraction ◽  
Binary Compound ◽  
Phase Relations ◽  
Ternary Solid Solution ◽  
Solid Solution Series ◽  
Subsolidus Phase ◽  
X Ray ◽  
Solution Series

The subsolidus phase relations in the ternary system La2O3–Bi2O3–CuO at 900 °C were investigated by X-ray powder diffraction. A new binary compound, Bi2La4O9, was found, as well as a binary and a ternary solid solution series, Bi1−xLaxO1.5 (0.16≤x≤0.33) and La2−xBixCuO4 (0≤x≤0.11), respectively.

A Review of the XRD Data of the Phases Present in the CaO-SrO-PbO System

1992 ◽  
Vol 7 (2) ◽  
pp. 96-98 ◽  
Author(s):  
Brian J. Reardon ◽  
Camden R. Hubbard
Keyword(s):  
Solid Solution ◽  
Ternary System ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Solid Solution Series ◽  
Powder Diffraction File ◽  
Reference Pattern ◽  
X Ray ◽  
Solution Series ◽  
Xrd Patterns

AbstractX-ray powder patterns for the phases in the CaO-SrO-PbO ternary system, along with the corresponding crystal structures, were obtained from the literature and from the Powder Diffraction File. Available XRD patterns were compared with each other and with a simulated pattern for each phase, yielding a recommended reference pattern. The simulated powder patterns presented here deal with the phases found within the (Ca,Sr)2PbO4solid solution series and are recommended for the Powder Diffraction File (PDF).

X-Ray Powder Diffraction Data for Tetragonal Zirconia Solid Solutions in System ZrO2-YTaO4

1992 ◽  
Vol 7 (3) ◽  
pp. 174-175 ◽  
Author(s):  
Dae-Joon Kim ◽  
Camden R. Hubbard
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Single Phase ◽  
Tetragonal Zirconia ◽  
Phase Region ◽  
Solid Solution Series ◽  
Powder Diffraction Data ◽  
Monoclinic Structure ◽  
X Ray ◽  
End Members

AbstractTetragonal zirconia (t- ZrCO2) can be stabilized with 15 to 22 mol% YTaO4. X-ray powder diffraction data for the end members of the solid solution series Zr0.76Y0.12Ta0.12O2 and Zr0.66Y0.17Ta0.17O2 are reported along with lattice parameters across the single phase region. These tetragonal zirconias are characterized by large tetragonalities (c/ √ 2a > 1.0203) and nontransformability to the monoclinic structure.

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