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1

Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods

Ani Zhecheva, Wei Sha, Savko Malinov, Adrian Long

Journal:

Surface and Coatings Technology

Year:

2005

Language:

english

File:

PDF, 909 KB

english, 2005

2

Studying and modeling surface gas nitriding for titanium alloys

A. Zhecheva, S. Malinov, W. Sha

Journal:

JOM Journal of the Minerals, Metals and Materials Society

Year:

2007

Language:

english

File:

PDF, 789 KB

english, 2007

3

Predicting Fluid Intelligence by Components of Reaction Time Distributions from Simple Choice Reaction Time Tasks

Schulz-Zhecheva, Yoanna, Voelkle, Manuel, Beauducel, André, Biscaldi, Monica, Klein, Christoph

Journal:

Journal of Intelligence

Year:

2016

Language:

english

File:

PDF, 693 KB

english, 2016

4

Particle size distribution and electrochemical properties of LiFePO4 prepared by a freeze-drying method

E. Zhecheva, Ml. Mladenov, P. Zlatilova, V. Koleva, R. Stoyanova

Journal:

Journal of Physics and Chemistry of Solids

Year:

2010

Language:

english

File:

PDF, 841 KB

english, 2010

5

Simulation of microhardness profiles of titanium alloys after surface nitriding using artificial neural network

A. Zhecheva, S. Malinov, W. Sha

Journal:

Surface and Coatings Technology

Year:

2005

Language:

english

File:

PDF, 1.22 MB

english, 2005

6

Characterisation of mesocarbon microbeads (MCMB) as active electrode material in lithium and sodium cells

R. Alcántara, F.J. Fernández Madrigal, P. Lavela, J.L. Tirado, J.M. Jiménez Mateos, C. Gómez de Salazar, R. Stoyanova, E. Zhecheva

Journal:

Year:

2000

Language:

english

File:

PDF, 458 KB

english, 2000

7

Thermally dependent structure of the Ni(II)-hexacyclen complex

M. Mitewa, P.R. Bontchev, G. Gencheva, E. Zhecheva, K. Kabassanov

Journal:

Inorganica Chimica Acta

Year:

1990

Language:

english

File:

PDF, 173 KB

english, 1990

8

Co(II) complex with N6-macrocyclic ligand hexacyclen

M. Mitewa, P.R. Bontchev, D. Vassileva, E. Zhecheva, D. Mechandjiev, K. Kabassanov

Journal:

Inorganica Chimica Acta

Year:

1987

Language:

english

File:

PDF, 140 KB

english, 1987

9

EPR monitoring of Mn4+ distribution in Li4Mn5O12 spinels

R. Stoyanova, M. Gorova, E. Zhecheva

Journal:

Journal of Physics and Chemistry of Solids

Year:

2000

Language:

english

File:

PDF, 394 KB

english, 2000

10

A new iron(II) complex with the N6-macrocyclic ligand hexacyclen with a thermally dependent structure

M. Mitewa, P.R. Bontchev, V. Russanov, E. Zhecheva, D. Mechandjiev, K. Kabassanov

Journal:

Year:

1991

Language:

english

File:

PDF, 367 KB

english, 1991

11

Stable complex of nickel(I) with the N6macrocycle hexacyclene

G. Gencheva, M. Miteva, E. Zhecheva, P. R. Bonchev

Journal:

Theoretical and Experimental Chemistry

Year:

1991

Language:

english

File:

PDF, 192 KB

english, 1991

12

Hydrogen absorption by nickel-containing vanadium-titanium alloys

M. Khrussanova, E. Zhecheva, R. Stoyanova, P. Peshev, B. Darriet, M. Chambon

Journal:

Materials Research Bulletin

Year:

1993

Language:

english

File:

PDF, 449 KB

english, 1993

13

X-ray diffraction, optical microscopy, and microhardness studies of gas nitrided titanium alloys and titanium aluminide

W. Sha, M.A. Haji Mat Don, A. Mohamed, X. Wu, B. Siliang, A. Zhecheva

Journal:

Materials Characterization

Year:

2008

Language:

english

File:

PDF, 7.42 MB

english, 2008

14

A new phosphate-formate precursor method for the preparation of carbon coated nano-crystalline LiFePO4

V. Koleva, E. Zhecheva, R. Stoyanova

Journal:

Journal of Alloys and Compounds

Year:

2009

Language:

english

File:

PDF, 1.25 MB

english, 2009

15

Sodium deficient nickel–manganese oxides as intercalation electrodes in lithium ion batteries

Kalapsazova, M., Stoyanova, R., Zhecheva, E., Tyuliev, G., Nihtianova, D.

Journal:

Journal of Materials Chemistry A

Year:

2014

Language:

english

File:

PDF, 1.16 MB

english, 2014

16

Modification of Petroleum Coke for Lithium-Ion Batteries by Heat-Treatment with Iron Oxide

Alcántara, Ricardo, Lavela, Pedro, Ortiz, Gregorio F., Tirado, José L., Stoyanova, Radostina, Zhecheva, Ekaterina, Miguel Jiménez Mateos, Juan

Journal:

Journal of The Electrochemical Society

Year:

2004

Language:

english

File:

PDF, 1.04 MB

english, 2004

17

Lithium Doping of Cobalt-Nickel Spinel Oxides at Low Temperature

Zhecheva, E., Stoyanova, R.

Journal:

Materials Science Forum

Year:

1994

File:

PDF, 356 KB

1994

18

Modelling of kinetics of nitriding titanium alloys

Zhecheva, A., Malinov, S., Katzarov, I., Sha, W.

Journal:

Surface Engineering

Year:

2006

Language:

english

File:

PDF, 205 KB

english, 2006

19

Raman Spectroscopy Study on Na2/3Mn1-xFexO2 Oxides

Sendova-Vassileva, Marushka, Stoyanova, Radostina, Carlier, Dany, Yoncheva, Meglena, Zhecheva, Ekaterina, Delmas, Claude

Journal:

Advances in Science and Technology

Year:

2010

Language:

english

File:

PDF, 777 KB

english, 2010

20

Effect of Sodium Content on the Reversible Lithium Intercalation into Sodium-deficient Cobalt-Nickel-Manganese Oxides Na x Co 1/3 Ni 1/3 Mn 1/3 O 2 (0.38≤x≤0.75) with a P 3-type of Structure

Ivanova, Svetlana, Zhecheva, Ekaterina, Kukeva, Rositsa, Tyuliev, Georgi Todorov, Nihtianova, Diana, Mihaylov, Lyuben, Stoyanova, Radostina

Journal:

The Journal of Physical Chemistry C

Year:

2016

Language:

english

File:

PDF, 5.07 MB

english, 2016

21

Media Use, Sleep Quality, and ADHD Symptoms in a Community Sample and a Sample of ADHD Patients Aged 8 to 18 Years

Thoma, Vanessa K., Schulz-Zhecheva, Yoanna, Oser, Christoph, Fleischhaker, Christian, Biscaldi, Monica, Klein, Christoph

Journal:

Journal of Attention Disorders

Year:

2018

Language:

english

File:

PDF, 113 KB

english, 2018

22

ChemInform Abstract: X-Ray Diffraction, EPR, and 6Li and 27Al MAS NMR Study of LiAlO2—LiCoO2 Solid Solutions.

R. ALCANTARA, P. LAVELA, P. L. RELANO, J. L. TIRADO, E. ZHECHEVA, R. STOYANOVA

Journal:

Year:

1998

File:

PDF, 35 KB

1998

23

ChemInform Abstract: Recent Advances in the Study of Layered Lithium Transition Metal Oxides and Their Application as Intercalation Electrodes

R. Alcantara, P. Lavela, J. L. Tirado, E. Zhecheva, R. Stoyanova

Journal:

Year:

1999

File:

PDF, 25 KB

1999

24

ChemInform Abstract: Formation of Metastable Na2CrO4-Type LiNiPO4 from a Phosphate—Formate Precursor.

Violeta Koleva, Radostina Stoyanova, Ekaterina Zhecheva

Journal:

Year:

2010

File:

PDF, 18 KB

2010

25

Formation of Metastable Na2CrO4-Type LiNiPO4 from a Phosphate–Formate Precursor

Violeta Koleva, Radostina Stoyanova, Ekaterina Zhecheva

Journal:

European Journal of Inorganic Chemistry

Year:

2010

Language:

english

File:

PDF, 736 KB

english, 2010

26

Ordered Olivine-Type Lithium–Cobalt and Lithium–Nickel Phosphates Prepared by a New Precursor Method

Violeta Koleva, Ekaterina Zhecheva, Radostina Stoyanova

Journal:

European Journal of Inorganic Chemistry

Year:

2010

Language:

english

File:

PDF, 1.50 MB

english, 2010

27

New Data on Chemical Delithiation of LixNi2-xO2 (0.6 < x < 1)

R. Stoyanova, E. Zhecheva

Journal:

Journal of Solid State Chemistry

Year:

1994

File:

PDF, 360 KB

1994

28

Li1-x-yHyCoO2: Metastable Layered Phases Obtained by Acid Digestion of LiCoO2(O3)

E. Zhecheva, R. Stayanova

Journal:

Journal of Solid State Chemistry

Year:

1994

File:

PDF, 296 KB

1994

29

Acid-Delithiated Li1-x(NiyCo1-y)1+xO2 as Insertion Electrodes in Lithium Batteries

J. Morales, R. Stoyanova, J.L. Tirado, E. Zhecheva

Journal:

Journal of Solid State Chemistry

Year:

1994

File:

PDF, 573 KB

1994

30

Structure and Electrochemical Properties of Boron-Doped LiCoO2

R. Alcántara, P. Lavela, J.L. Tirado, R. Stoyanova, E. Zhecheva

Journal:

Journal of Solid State Chemistry

Year:

1997

Language:

english

File:

PDF, 557 KB

english, 1997

31

Electrocatalytic activity of LixNi1−xO (0 ≤ x < 0.5) solid solutions in the oxygen evolution reaction

I. Nikolov, R. Darkaoui, E. Zhecheva, R. Stoyanova, N. Dimitrov, T. Vitanov

Journal:

Journal of Electroanalytical Chemistry

Year:

1993

Language:

english

File:

PDF, 1008 KB

english, 1993

32

Bulk defects in Co3O4, pure and slightly doped with lithium, revealed by EPR of the tetrahedral Co2+ ions

S. Angelov, E. Zhecheva, R. Stoyanova, M. Atanasov

Journal:

Journal of Physics and Chemistry of Solids

Year:

1990

Language:

english

File:

PDF, 546 KB

english, 1990

33

EPR study of Ni3+-DOPED ACoO2 (A = H, Li) powders

S. Angelov, C. Friebel, E. Zhecheva, R. Stoyanova

Journal:

Journal of Physics and Chemistry of Solids

Year:

1992

Language:

english

File:

PDF, 570 KB

english, 1992

34

Magnetic interactions in layered LiNiO2 revealed by EPR of Ni3+

R. Stoyanova, E. Zhecheva, C. Friebel

Journal:

Journal of Physics and Chemistry of Solids

Year:

1993

Language:

english

File:

PDF, 501 KB

english, 1993

35

Mechanism of the decomposition of cobaltous compounds in vacuo

D. Mehandjiev, E. Nikolova-Zhecheva

Journal:

Thermochimica Acta

Year:

1980

Language:

english

File:

PDF, 529 KB

english, 1980

36

A magnetic study of the formation of NiCO2O4

D. Mehandjiev, E. Nikolova-Zhecheva

Journal:

Thermochimica Acta

Year:

1981

Language:

english

File:

PDF, 522 KB

english, 1981

37

Copper(II) complexes of (1-[isopropylamine]-3-[1-naphthyloxy]-2-propanol) (propranolol)

Panayot R. Bontchev, Hussein Kadum, Bissera Evtimova, Chudomir Nachev, Darvin Ivanov, Ekaterina Zhecheva, Dimiter Mehandjiev

Journal:

Journal of Inorganic Biochemistry

Year:

1992

Language:

english

File:

PDF, 559 KB

english, 1992

38

Stabilization of the layered crystal structure of LiNiO2 by Co-substitution

E. Zhecheva, R. Stoyanova

Journal:

Solid State Ionics

Year:

1993

Language:

english

File:

PDF, 598 KB

english, 1993

39

“Sandwich”-type clusters revealed by EPR of Ni3+ in a partially ordered LixNi1−xO (x ⋍ 0.3)

R. Stoyanova, E. Zhecheva, S. Angelov

Journal:

Solid State Ionics

Year:

1993

Language:

english

File:

PDF, 671 KB

english, 1993

40

Effect of Mn-substitution for Co on the crystal structure and acid delithiation of LiMnyCo1−yO2 solid solutions

R. Stoyanova, E. Zhecheva, L. Zarkova

Journal:

Solid State Ionics

Year:

1994

Language:

english

File:

PDF, 742 KB

english, 1994

41

Ni3+ −Ni2+ segregation in LixNi2−xO2 solid solutions (0.6 ⩽x < 1)

R. Stoyanova, E. Zhecheva, C. Friebel

Journal:

Solid State Ionics

Year:

1994

Language:

english

File:

PDF, 506 KB

english, 1994

42

Interaction between the components of a LiClCo3O4 catalyst for oxidative coupling of methane

E. Zhecheva, R. Stoyanova, R. Klissurska

Journal:

Journal of Molecular Catalysis

Year:

1992

Language:

english

File:

PDF, 586 KB

english, 1992

43

Electrochemical performance and local cationic distribution in layered LiNi1/2Mn1/2O2 electrodes for lithium ion batteries

M. Yoncheva, R. Stoyanova, E. Zhecheva, R. Alcántara, G. Ortiz, J.L. Tirado

Journal:

Electrochimica Acta

Year:

2009

Language:

english

File:

PDF, 1.31 MB

english, 2009

44

Coating technique for improvement of the cycling stability of LiCo/NiO2 electrode materials

E. Zhecheva, Ml Mladenov, R. Stoyanova, S. Vassilev

Journal:

Journal of Power Sources

Year:

2006

Language:

english

File:

PDF, 315 KB

english, 2006

45

EPR studies of Li deintercalation from LiCoMnO4 spinel-type electrode active material

Ekaterina Zhecheva, Radostina Stoyanova, Ricardo Alcántara, Pedro Lavela, José L. Tirado

Journal:

Journal of Power Sources

Year:

2006

Language:

english

File:

PDF, 243 KB

english, 2006

46

Comparative analysis of the changes in local Ni/Mn environment in lithium–nickel–manganese oxides with layered and spinel structure during electrochemical extraction and reinsertion of lithium

E. Zhecheva, R. Stoyanova, R. Alcántara, P. Lavela, J.L. Tirado

Journal:

Journal of Power Sources

Year:

2007

Language:

english

File:

PDF, 364 KB

english, 2007

47

The electrochemical behavior of low-temperature synthesized FeSn2 nanoparticles as anode materials for Li-ion batteries

U.G. Nwokeke, R. Alcántara, J.L. Tirado, R. Stoyanova, E. Zhecheva

Journal:

Journal of Power Sources

Year:

2011

Language:

english

File:

PDF, 507 KB

english, 2011

48

High-pressure synthesis of solid solutions between trigonal LiNiO2 and monoclinic Li[Li1/3Ni2/3]O2

Elitza Shinova, Ekaterina Zhecheva, Radostina Stoyanova, Geoffrey D. Bromiley

Journal:

Journal of Solid State Chemistry

Year:

2005

Language:

english

File:

PDF, 839 KB

english, 2005

49

High-pressure synthesis and electrochemical behavior of layered oxides

E. Shinova, E. Zhecheva, R. Stoyanova, G.D. Bromiley, R. Alcántara, J.L. Tirado

Journal:

Journal of Solid State Chemistry

Year:

2005

Language:

english

File:

PDF, 346 KB

english, 2005

50

Crystal structure, microstructure and reducibility of LaNixCo1−xO3 and LaFexCo1−xO3 Perovskites (0

S. Ivanova, A. Senyshyn, E. Zhecheva, K. Tenchev, R. Stoyanova, H. Fuess

Journal:

Journal of Solid State Chemistry

Year:

2010

Language:

english

File:

PDF, 2.14 MB

english, 2010