scholarly journals The Identification of Turquoise by Infrared Spectroscopy and X-ray Powder Diffraction

1983 ◽  
Vol 19 (3) ◽  
pp. 164-168 ◽  
Author(s):  
Th. Lind ◽  
K. Schmetzer ◽  
H. Bank
Keyword(s):  
Infrared Spectroscopy ◽  
Powder Diffraction ◽  
X Ray

Tetraalkylammonium Bromochlorocuprates(II)

1979 ◽  
Vol 32 (3) ◽  
pp. 691 ◽  
Author(s):  
DW Smith ◽  
T Yeoh
Keyword(s):  
Infrared Spectroscopy ◽  
Powder Diffraction ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
X Ray

(NMe4)2CuBrnC14-n and (NEt4)nCuBrnCl44-n (n = 1, 2, 3) have been prepared and characterized by X-ray powder diffraction and far-infrared spectroscopy. The tetramethylammonium compounds are isomorphous with each other and with the corresponding compounds where n = 0, 4. The tetraethylammonium compounds constitute another isomorphous series. All the compounds apparently contain discrete CuBrnCI4-n2- anions, with flattened tetrahedral configurations.

Improved Crystallinity of Zinc Sulfide Nanoparticles in Aqueous Environment

2005 ◽  
Vol 879 ◽  
Author(s):  
Navendu Goswami ◽  
P. Sen
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Zinc Sulfide ◽  
Structural Transformation ◽  
Powder Diffraction ◽  
Aqueous Environment ◽  
X Ray ◽  
Zinc Sulfide Nanoparticles

AbstractZinc sulfide nanoparticles, prepared employing a non-equilibrium route, are investigated for surface related effects. Water has been shown to induce a structural transformation in nanoparticles prepared this way, which is not related to their particle size. Employing Fourier transform infrared spectroscopy and x-ray powder diffraction, we show here the importance of S-H interaction in the buildup to the final ZnS structure of these nanoparticles. These particles hold promise as water sensors.

scholarly journals A barium germanium 1,2-ethanediolato complex as precursor for barium metagermanate

2018 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Powder Diffraction ◽  
Mixed Oxide ◽  
Phase Evolution ◽  
X Ray ◽  
Oxide Powders ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Shrinkage Behaviour ◽  
Ft Ir

The thermal behaviour of [Ba(HOC2H4OH)2Ge(OC2H4O)3] (2) as a BaGeO3 precursor,and its phase evolution during thermal decomposition in different atmospheres are described herein.The precursor complex decomposes in air to a finely divided mixture of BaCO3 and GeO2, whichsubsequently reacts above 650 °C to orthorhombic BaGeO3, transforming above 800 °C tohexagonal BaGeO3. The shrinkage behaviour of BaGeO3 compacts made from the as-preparedpowders as well as from conventional mixed-oxide powders has been investigated. The sampleswere characterised by Fourier transformed infrared spectroscopy (FT-IR), X-ray powder diffraction(XRD), dilatometric measurements and thermoanalytic investigations (TG/DTA).

The formation of rhodochrosite–smithsonite (MnCO3–ZnCO3) solid-solutions at 5°C

1995 ◽  
Vol 59 (396) ◽  
pp. 481-488 ◽  
Author(s):  
Michael E. Böttcher
Keyword(s):  
Aqueous Solution ◽  
Infrared Spectroscopy ◽  
Aqueous Solutions ◽  
Crystal Lattice ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Solubility Product ◽  
Experimental Conditions ◽  
X Ray ◽  
Bicarbonate Solutions

AbstractMnxZn(1−x)CO3 solid-solutions were prepared at 5°C by precipitation from metal-bearing bicarbonate solutions. The solids were identified by X-ray powder diffraction and infrared spectroscopy. Zn2+ ions substitute extensively for Mn2+ ions in the crystal lattice of anhydrous rhombohedral carbonates. Throughout the 24 h during which the experiments were conducted, the aqueous solutions remained undersaturated with respect to pure oxides, sulphates, hydroxides and hydroxysulphates. The solutions, however, were supersaturated with MnxZn(1−x)CO3 of any given composition. Besides the anhydrous rhombohedral carbonates, Zn4(OH)2(CO3)3·4H2O was precipitated from an aqueous solution with initially high Zn2+ concentration. The negative logarithm of the solubility product of Zn4(OH)2(CO3)3·4H2O was estimated theoretically to be 43.9 (25°C). Remaining saturation with respect to Zn4(OH)2(CO3)3·4H2O was calculated accordingly. The suggestion is made that hydrated zinc hydroxycarbonate is metastable under the experimental conditions used here, but that it should transform into anhydrous carbonates.

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