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Article
Some investigations of sea sands from the Black Sea coastline
Sands from the coastline of Bourgas Bay, Black Sea, were studied by means of Mössbauer spectroscopy, X-ray diffraction, infrared spectroscopy and gamma-spectrometry. Samples of the residue after magnetic separ...
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Article
A Mössbauer study of synthetic magnetite
Samples of magnetite, prepared by standard methods for obtaining of melted ammonia synthesis catalysts have been studied. The samples contain small amounts of additives, such as K2O (0.4–1 mass%), CaO (0.7–1.5 ma...
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Article
Mössbauer and X-ray study of natural magnetite sands
Black sands originating from north, west and south seaside strips of the Bay of Burgas, Black Sea, were investigated. It was found that these sands are martitized magnetites. Their composition involves mixture...
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Article
Mössbauer and X-ray characterization and catalytic properties of Co-promoted ammonia synthesis catalysis
Phase composition of Co-promoted ammonia synthesis catalysts has been studied by means of Mössbauer spectroscopy and X-ray diffractometry. Co-promoted catalysts have maximum activity at 5–7% CoO concentration....
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Article
Magnetic field effect on steel-3 corrosion in hydrogen sulfide industrial waste water. A Mössbauer study
The Mössbauer analysis of rust samples obtained in the presence and absence of a magnetic field shows that there is a difference in the qualitative and quantitative composition of the corrosion products. The e...
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Article
Mössbauer and X-ray analysis of corrosion products from surface equipment of oil production well
Wellhead equipment corrosion samples including internal surface of choke were analyzed by means of Mössbauer spectroscopy and X-ray diffractometry. The samples include some impurities of quartz, dolomite and c...
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Article
Mössbauer study on some corrosion inhibitors
The inhibiting action of film-forming Dodigen 481 and A-5 inhibitors in petrol-water media was studied by means of Mössbauer spectroscopy and gravimetric method. The inhibiting effect is about 90%. The mechani...
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Article
Interaction between catalysts for ammonia synthesis and oxygen
Reversible poisoning of the catalysts for ammonia synthesis by oxygen has been used to eliminate the pyrophoric nature of the reduced catalysts via their treatment by the mixtures of nitrogen, hydrogen or heli...
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Article
Mössbauer study of carbide phases in catalysts for ammonia synthesis
Samples of a catalyst CA-1 for ammonia synthesis were studied. After reduction the samples were treated with CO2 or with a mixture of 1% O2+2.4% H2O+CO2 at temperatures between 600 and 783 K. Mössbauer spectrosco...
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Article
A kinetic study of the interaction between α-iron and CuCl2. 2H2O by Mössbauer spectroscopy
The kinetics of the solid-phase interaction in the system α-Fe-CuCl2. 2H2O was studied by means of Mössbauer spectroscopy. It was established that compounds of divalent and trivalent iron were formed by diffusion...
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Article
Mössbauer study of the thermal decomposition of co-precipitated Fe/NH4/2/SO4/2.6H2O and Ni/NH4/2/SO4/2.6H2O
Using Mössbauer spectroscopy, the thermal decomposition products of co-precipitated Fe/NH4/2/SO4/2.6H2O and Ni/NH4/2/SO4/2.6H2O for two hours at various temperatures in open air have been studied and identified. ...
