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Soviet mining science, 1974
1. Our results show that sulfurated azurite is floatable reasonably well not only only by xanthates, but also by dixanthides. 2. Extraction of azurite increases with the length of the chain of the xanthate radical, but its flotation requires sulfuration, even when xanthates with long hydrocarbon radicals are used. 3.
N. S. Samsonova +2 more
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1. Our results show that sulfurated azurite is floatable reasonably well not only only by xanthates, but also by dixanthides. 2. Extraction of azurite increases with the length of the chain of the xanthate radical, but its flotation requires sulfuration, even when xanthates with long hydrocarbon radicals are used. 3.
N. S. Samsonova +2 more
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Conversion of azurite into tenorite
Studies in Conservation, 1989Abstract In the vicinity of Berne Minster in Switzerland, 500 fragments of numerous late gothic polychromed sandstone sculptures deliberately destroyed in 1528 were recovered. A preliminary study of the painting technique and materials showed that, among other pigments, azurite had been used.
Gutscher, Daniel +3 more
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The magnetic behaviour of azurite
Physica, 1962Abstract The magnetic susceptibility of azurite has been determined in the three principal directions between 1 and 300°K. A transition to the antiferromagnetic state was observed, the Neel temperature being 1.85°K for small external fields. The variation of the transition temperature with field strength is given.
E. Frikkee, J. Van Den handel
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Proton magnetic resonance in azurite
Antiviral Research, 1959Abstract Proton magnetic resonance experiments have been performed in a single crystal of azurite, Cu 3 (CO 3 ) 2 (OH) 2 , in the liquid hydrogen and liquid helium temperature ranges for different field strengths and orientations. Two zero field resonance lines exist in the antiferromagnetic state.
W. van der Lugt, N.J. Poulis
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Absorption spectra of Cu2+ in azurite
Solid State Communications, 1981Abstract EPR and optical absorption studies in azurite have been carried out at room and low temperatures. The EPR spectrum reveals that the ground state for Cu 2+ ion is 2 B 1 . Peak to peak linewidth of EPR spectrum is calculated ( ΔH p = 76 G) and found to be close with the observed value. The Cu 2+ ion situated in D 4 h symmetry with
B.J. Reddy, K.B.N. Sarma
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A Normalized Difference Spectral Recognition Index for Azurite Pigment
Applied Spectroscopy, 2020Hyperspectral technology is a nondestructive, fast, and reliable method for the detection and restoration of relics. Most of the band characteristics of mineral pigment are concentrated between 2200 and 2400 nm, and these data are expensive to obtain (the required imaging sensor is expensive).
Taixia Wu +4 more
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Physics Letters A, 1970
Abstract Magnetothermal measurements on single crystal azurite [Cu 3 (CO 3 ) 2 (OH) 2 ] indicated that spin flopping occurred above 19.0 kG. The spin-flop-antiferromagnetic boundary could be represented by an equation H c = 16.5 + 1.20 T 2 with H c in kG. The triple point ( T 3 ) was determined as T = 1.60°K and H c = 19.5 kG.
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Abstract Magnetothermal measurements on single crystal azurite [Cu 3 (CO 3 ) 2 (OH) 2 ] indicated that spin flopping occurred above 19.0 kG. The spin-flop-antiferromagnetic boundary could be represented by an equation H c = 16.5 + 1.20 T 2 with H c in kG. The triple point ( T 3 ) was determined as T = 1.60°K and H c = 19.5 kG.
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Stability relations of malachite and azurite
Mineralogical Magazine, 1986AbstractStability relations of malachite and azurite are calculated and shown in Eh-pH diagrams, using ΔF (Gibbs free energy) values listed in Garrels and Christ (1965). The malachite/azurite transition is very sensitive to small chemical changes in the environment: equilibrium is reached at PCO2 = 10−3.45 atm., i.e. close to normal values, whereas the
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The infra-red spectra of azurite and malachite
Spectrochimica Acta Part A: Molecular Spectroscopy, 1968Abstract The infra-red spectra of azurite and malachite have been recorded as Nujol mulls in the region 5000-250 cm−1 and as Rigidex disks in the region 500-60 cm−1. The vibrations of the carbonate ion and of the Cu0 skeleton have been interpreted in terms of the known crystal structures, and the skeletal vibrations have been assigned by means of a ...
J.A. Goldsmith, S.D. Ross
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