Vilma Stoyanova PETKOVA

Res. Assoc., PhD

Central Laboratory of Mineralogy and Crystallography (CLMC),
Bulgarian Academy of Sciences (BAS)
http://www.clmc.bas.bg 
1113 Sofia, Acad. G. Bonchev Str., Bl. 107, BULGARIA
Phone: (+3592) 8700161/34; Fax.: (+3592) 97 97 056; 
E-mail: vilmapetkova(àt)gmail(dît)com; vilmap(àt)dir(dît)bg; vilma_bg(àt)yahoo(dît)com

Curriculum vitae and experience record of personnel position

Date of birth: March 9th, 1961
Nationality: Bulgarian
Number of years experience: 16
Education and professional qualifications: University of Chemical Technology and Metallurgy, Sofia,
Dipl. Chem. Eng., Ph.D.
Present Employer: Central Laboratory of Mineralogy and Crystallography (CLMC) - BAS
Years with this Employer: 16

Summary of relevant employment/experience

From
To
Employer
Location
Position and main discipline
2000
Present
Central Laboratory of Mineralogy and Crystallography (CLMC) - BAS
Sofia, Bulgaria
Research Assistant, Management of Solid Wastes, Nonwaste Technologies, 
Inorganic Substances Kinetics, Thermal Analysis, Phys.-Chem. Methods
1997
2000
Central Laboratory 
of Physico-Chemical Mechanics (CLPhChM) - BAS
Sofia, Bulgaria
Research Assistant, Non-Metal Construction Composite materials, Kinetics, Thermal Analysis, Phys.-Chem. Methods
1996
1997
Central Laboratory 
of Physico-Chemical Mechanics (CLPhChM) - BAS
Sofia, Bulgaria
Chemist;
Non-Metal Construction Composite materials
1994
1995
Higher Institute of Forestry; Dept. of Chemistry & Biochemistry
Sofia, Bulgaria
Associate Assistant Chemistry & Biochemistry
1993
1994
Informa - Inform. Centre for Technology Transfer
Sofia, Bulgaria
Expert
1990
1991
University of Chemical Technology and Metallurgy, Sofia
Sofia, Bulgaria
Chemist-engineer
1985
1987
Institute of  Little Shipping & Chemical Products
Dimitrovgrad
Bulgaria
Chemist-engineer

Education background:

From
To
Employer
Location
Position and main discipline
1987
1993
University of Chemical Technology and Metallurgy, Sofia
Sofia, Bulgaria
Ph. D. Thesis: "Thermochemical decomposition of FeSO4.H2O and Al2(SO4)3.xH2O"
1979
1985
University of Chemical Technology and Metallurgy, Sofia
Sofia, Bulgaria
Chemist-engineer
1976
1979
Russsian Language. College of Russsian Language "Maxim Gorki"
Rousse, Bulgaria
Certificate Level A (C.L.)

Language skills:  

Language

Reading

Speaking

Writing

Russian

5

5

5

English

4

4

4

French

3

3

3

Basic Description in Ph. D. Thesis

A great part of the investigations presented in my Ph. D. Thesis are related to the understanding of the mechanism of thermal decomposition of FeSO4.H2O and Al2(SO4)3xH2O. Principal schemes have been developed for the proceeding reactions in different gaseous media - Ar, air, H2. Using the results of the thermal analysis, the emf-method and different physical methods as X-ray, Mossbauer spectroscopy, Electron microscopy, IR spectroscopy, the formation of various intermediate compounds of the type FeOHSO4 and/or Fe2O(SO4)2, Al2O(SO4)2, has been proved. The kinetics of the thermal decomposition processes of FeSO4.H2O and Al2(SO4)3.xH2O under isothermal regime has also been studied and data are presented from the mathematical processing of the results.

Another part of my Ph. D. Thesis considered opportunities of obtaining different barrium ferrites such as BaFeO3, BaFeO4, BaFe12O19 during the thermal decomposition in the systems: FeSO4.H2O-BaO2, FeS2-BaO2, FeS2-FeSO4.H2O-BaO2. It has been established that the formation of ferrites depends on the ratio of the initial reagents, the temperature, the heating conditions and the partial pressures of the gaseous components, such as Oxygen, Water vapour and SO2/SO3.

The barrium ferrites were investigated by means of X-ray analysis, Mossbauer Spectroscopy and Electron spectroscopy.

A great part of the investigations are published in Journal of Thermal Analysis and Calorimetry and Thermochimica Acta.

Research Interests:

PROJECTS:

Memberships in Professional Organizations:

List of publlications:

Y. Pelovski, I. Gruncharov, T. Nishev, V. Petkova, Pl. Kirilov, I. Dombalov, On the reduction of Phosphogypsum to CaS with Gaseous reducers, Dep. CINTI - Sofia, No ND/2270/89, (1989)

Y. Pelovski, V. Petkova, I. Dombalov, I. Gruncharov, Now Days Directions for FeSO4.H2O By-product Manufacturing, Dep. CINTI - Sofia, No ND/4155/90, (1990)

Y. Pelovski, V. Petkova, I. Gruncharov, I. Dombalov, Intensification of Al2(SO4)3.xH2O Thermal Decomposition, Centre of Tribology, Sofia, No 3-4, (1991), 178-190

Y. Pelovski, V. Petkova, I. Dombalov, Pl. Kirilov, I. Gruncharov, Thermochemical Study of FeSO4 - BaO2 System, Annuaire de l'ecole Superieure de Chimie Technology, Sofia, vol. 31, No 3, (1991), 153-160

Y. Pelovski, T. Nishev, V. Petkova, I. Gruncharov, I. Dombalov, Thermal Stabillity of Phosphogypsum with Different Origin, Annuaire de L'ecole Superieure de Chimie Technologique, Sofia, vol. XXXI, Livre 2, (1992), 51-57

Y. Pelovski, V. Petkova, I. Dombalov, I. Gruncharov, "On the decomposition of FeSO4 in the presence of FeS2 and BaO2", "Journal of Thermal Analysis", v. 36, (1990), 1727 - 1742

Y. Pelovski, V. Petkova, I. Gruncharov, B. Pacewska, J. Pysiak, "The thermal decomposition of aluminium sulfate in different gas phase environments", "Thermochimica Acta", v.205, (1992), 219 - 224

Y. Pelovski, V. Petkova, I. Gruncharov, B. Pacewska, J. Pysiak, "Investigation of thermal decopmosition of aluminium sulphate by the emf-method", "Thermochimica Acta", v.205, (1992), 283 - 287

A. Toneva, V. Petkova, Y. Pelovski, I. Dombalov, "Tribochemical prosses in the system BaO - TiO2", First Balkan conference on Tribology, BALKANTRIB'93, 1-3 October 1993, Proceeding, v. 2.3, (1993), 188-194

Petkova V., A. Toneva, Y. Pelovski, Iv. Dombalov, "Tribochemical prosses in the system BaO - Fe2O3",  First Balkan conference on Tribology, BALKANTRIB'93, 1-3 October 1993, Proceeding, v. 2.3, (1993), 195-206

Y. Pelovski, V. Petkova, "Tribochemistry and kinetics of Al2(SO4)3.xH2O decomposition", "J. Therm. Anal.", v. 43, (1995), 339-349

Y. Pelovski, M. Tsankov, V. Petkova, I. Gruncharov, "On the thermochemical decomposition of Al-Na sulphate crystallohydrate", "J. Therm. Anal.",  v. 43, (1995), 351-357

Y. Pelovski, V. Petkova, S. Nikolov, "Study of the mechanism of the thermochemical decomposition of ferros sulphate monohydrate", "Thermochimica Acta", 274, (1996), 273-280

Y. Pelovski, V. Petkova, "Thermal decomposition of FeSO4.H2O - BaO2 mixtures", "Thermochimica Acta", 284, (1996), 407-418

Y. Pelovski, V. Petkova, "Mechanism and Kinetics of Inorganic Sulphates Decomposition", "J. Therm. Anal.", v. 49, (1997), 1227-1241

Petkova V., "Isothermal studies on the decomposition of FeSO4.H2O and BaO2 mixtures", "J. Therm. Anal.", v. 49, (1997), 1373-1384

Bozhinov G., N. Barovsky, M. Mironova, V. Petkova, S. Rousseva, Evaluation of Silicate Systems Ageing on the Basic of Their Structure Characteristics, 8th  International Conference on Mechanics and Technology of Composite Materials, September 29 - October 2 1997, Sofia, Proceeding, (1997), 80-85

Y. Pelovski, V. Petkova, "Investigation on Thermal Decomposition of FeS2 and BaO2 Mixtures", Part I, Journal of Thermal Analysis and Calorimetry, 56, (1999), 95-99

Y. Pelovski, V. Petkova, "Investigation on Thermal Decomposition of FeS2 and BaO2 Mixtures", Part II, Journal of Thermal Analysis and Calorimetry, 56, (1999), 101-108

Dombalov I., Y. Pelovski, V. Petkova, Thermal Stability and Properties of New NPS- Fertilizers, Journal of Thermal Analysis and Calorimetry, 56, (1999), 87-94

Y. Pelovski, Iv. Dombalov, V. Petkova, Mechanical Triboactivation of Dolomite, Journal of Thermal Analysis and Calorimetry, v. 64, (2001), 1257-1263

V. Petkova, Y. Pelovski, Investigation on the Thermal Properties of Fe2O(SO4)2. Part I, Journal of Thermal Analysis and Calorimetry, v. 64, (2001), 1025-1035

V. Petkova, Y. Pelovski, Investigation on the Thermal Properties of Fe2O(SO4)2. Part II, Journal of Thermal Analysis and Calorimetry, v. 64, (2001), 1037-1044

R. Kotsilkova, V. Petkova, Y. Pelovski, Thermal analysis of polymer-silicate nanocomposites, Journal of Thermal Analysis and Calorimetry, v. 64, (2001), 591-598

Petkova V., P. Kostadinova, S. Stefanova, Y. Pelovski, I. Dombalov, Influence of the mechanochemical activation at phaseformation in the system Tunisian phosphate – Ammonium sulphate, X Anniversary Sciense-technical session KONTAKT 2002, 31.10-01.11.2002, Sofia, Bulgaria, Proc. KONTAKT 2002, Sofia, (2002), 110-119

Petkova V., P. Kostadinova, V. Stoyanov, À. Toneva, Y. Pelovski, I. Dombalov, Possibilities for solid-phase synthesis in the system Tunisian phosphate – Ammonium sulphate, X Anniversary Sciense-technical session KONTAKT 2002, 31.10-01.11.2002, Sofia, Bulgaria, Proc. KONTAKT 2002, Sofia, (2002),138-145

Petkova V., À. Toneva, P. Kostadinova, Y. Pelovski, I. Dombalov, Investigation on the thermal decomposition of the triboactivated mixtures of Tunisian phosphate – Ammonium sulphate, X Anniversary Sciense-technical session KONTAKT 2002, 31.10-01.11.2002, Sofia, Bulgaria, Proc. KONTAKT 2002, Sofia, (2002), 120-127

Pelovski Y., V. Petkova, P. Kostadinova, V. Stoyanov, I. Dombalov, Influence of the conditions of triboactivation on the solid-phase synthesis in the system Tunisian phosphate – Ammonium sulphate, X Anniversary Sciense-technical session KONTAKT 2002, 31.10-01.11.2002, Sofia, Bulgaria, Proc. KONTAKT 2002, Sofia, (2002), 128-137

Pelovski Y., V. Petkova, I. Dombalov, Thermal analysis of mechanoactivated mixtures of Tunisia phosphorite and ammonium sulfate, Proc of VIIIth European Symposium on Thermal Analysis and Calorimetry Barcelona, ESTAC’8, 25-29 August, 2002, Journal of Thermal Analysis and Calorimetry (in press)

Petkova V., Y. Pelovski, Thermal analysis and solid electrolyte system study of FeSO4.H2O-BaO2 mixtures, Proc of VIIIth European Symposium on Thermal Analysis and Calorimetry, ESTAC’8 Barcelona, 25-29 August, 2002, Journal of Thermal Analysis and Calorimetry (in press)

Ivanova V., V. Petkova, Y. Pelovski, Thermal analysis of new soil sorption regulators, Proc. of VIIIth Int. Sem. on Thermal Analysis and Calorimetry to the memory of Prof. Bretsznajder, 18-20.09.2002, Plock, Poland, Journal of Thermal Analysis and Calorimetry (in press)

Petkova V., S. Stephanova, A. Toneva, I. Dombalov, Y. Pelovski, Investigation of the influence of SiO2 on the phase-formation in the system natural phosphate and ammonium sulphate, Second Balkan Conference on Glass Science and Technology, 14th Conference on Glass and Ceramics, 24-28 September 2002, Varna, Bulgaria, (in English), (in press)

Pelovski, Y., V. Petkova, I. Dombalov, 2003. Thermal analysis of mechanoactivated mixtures of Tunisia phosphorite and ammonium sulfate. - Journal of Thermal Analysis and Calorimetry, vol. 72, 967-980.

Petkova, V., Y. Pelovski, 2003. Thermal analysis and solid electrolyte system study of FeSO4.H2O-BaO2 mixtures. - Journal of Thermal Analysis and Calorimetry, vol. 72, 981-989.

Ivanova, V., V. Petkova, Y. Pelovski, 2003. Thermal analysis of new soil sorption regulators. - Journal of Thermal Analysis and Calorimetry, vol. 74, 387-394.

Petkova, V., Y., Pelovski, V., Hristova. 2005. Thermal analysis for identification of E-beam nanosize Ammonium Sulfate, Journal of Thermal Analysis and Calorimetry, Vol. 82, 813–817.

Petkova, V., Y., Pelovski, I., Dombalov, K.,Tonsuaadu. 2005. Thermochemical investigations of Natural Phosphate with Ammonium Sulphate additive. – 13th ICTAC Congress, September 12-19, 2004, Chia Laguna, Sardina, Italy, Journal of Thermal Analysis and Calorimetry, v.80, (2005), 701-708.

Petkova, V., Y., Pelovski, I., Dombalov, P., Kostadinova. 2005. Influence of triboactivation conditions on the synthesis in Natural Phosphate - Ammonium Sulphate system. – 13th ICTAC Congress, September 12-19, 2004, Chia Laguna, Sardina, Italy, Journal of Thermal Analysis and Calorimetry, v.80, (2005), 709-714.

Kunev, B., V. Petkova, D., Paneva, D., Mitova, E., Manova, I., Mitov. 2005. Mechanochemical and thermomechanochemical treatment of Pyrite Concentrate – effect of particle size. - V Workshop "NANOSCIENCE & NANOTECHNOLOGY”, 24-27 November 2004, Sofia, (in English), Proc. of "NANOSCIENCE & NANOTECHNOLOGY”, eds. E. Balabanova, I. Dragieva, Heron Press, Sofia, (2005), 163-166.

Petkova V., Y. Pelovski and V. Hristova. 2005. Thermal Analysis for Identification of E-beam Nanosize Ammonium Sulfate, Journal of Thermal Analysis and Calorimetry, Vol. 82, (2005), 813–817

Pelovski Y., V. Petkova, I. Dombalov, (2006). Thermotribochemical treatment of low grade natural phosphates, 9th European Symposium on Thermal Analysis and Calorimerty, 27-31 August 2006, Krakow, Poland