K.D. Djuneva

Sofia University "St. Kliment Ohridski"

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

S. K. Peneva

Sofia University "St. Kliment Ohridski"

E.A. Tsukeva

Bulgarian Academy of Sciences

D. Nihtianova

Bulgarian Academy of Sciences

N S Neykov

Sofia University "St. Kliment Ohridski"

V. Rusanov

D.V.Efremov Institute of Electrophysical Apparatus (Russia)

E. Tsakin

Stoyan Gutzov

Sofia University "St. Kliment Ohridski"

I. Z. Kostadinov

Rezekne Academy of Technologies

S.H. Sevov

Gjorgji R. Atanasov

Cooperative Institutions

Sofia University "St. Kliment Ohridski"

Bulgarian Academy of Sciences

Technical University of Sofia

Institute of Physical Chemistry

Institute of General and Inorganic Chemistry

Agrobioinstitute

D.V.Efremov Institute of Electrophysical Apparatus (Russia)

Institute for Nuclear Research and Nuclear Energy

Magna International (Germany)

University of Lübeck

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Metastable ZrO₂ crystal structures in electron beam evaporated thin films

Zeitschrift für Kristallographie - Crystalline Materials (2000)

S. K. Peneva Stoyan Gutzov K.D. Djuneva Gjorgji R. Atanasov Ts. Marinova

Electron diffraction evidence for the existence of metastable ZrO 2 in thin zirconia films grown by electron beam evaporation is presented. X-ray powder diffraction results show that the films are at the boundary of the amorphous/crystalline state of the matter. Micro-regions of unknown crystalline structures of ZrO 2 are formed during the growth and are observed by transmission and reflection electron diffraction. Two CaF 2 -type zircon oxides exist inside the films. They are the known high temperature cubic phase with lattice parameter a = 5.09 ± 0.08 Å and an isostructural analogue with a = 5.40 ± 0.10 Å. Series of hexagonal and cubic close packed structures, believed to be related to the packing of clusters, are also detected. The existence of metastable zirconia structures is explained by Ostwald's rule of stages. A comparison of some of the metastable oxide structures of ZrO 2 films with their isostructural analogues observed in SiO 2 and SnO 2 films is included.

Isostructural

Metastability

10.1524/zkri.2000.215.2.88

Cite

Citations (2)

Metastable phases in thin tin and lead films and their oxides

Acta Crystallographica Section A Foundations of Crystallography (1981)

S. K. Peneva K.D. Djuneva D. Nihtianova

crystalline layers at and below L~e interface 1 can be interpreted in terms of a roughening of L~e crystal sur-face~ Trajectory plots normal to the interface shaH the onset of a cooperative melting process, and consequent distortions of the nearby cryst~l penetrate to 4-5 layers below the interface~ Results from constant volume and triple point calculations designed to suppress these movem~nts ;,..;ill be presentedr and the detailed structure of tr~e equilibrium interface discussed.

Metastability

Lead (geology)

10.1107/s0108767381095184

Cite

Citations (0)

RHEED study of thin tin films grown at deposition rates of 2 to 10 Å/s

Journal of Crystal Growth (1989)

E.A. Tsukeva K.D. Djuneva S. K. Peneva S.H. Sevov

Reflection

Deposition

10.1016/0022-0248(89)90540-x

Cite

Citations (1)

RHEED study of the initial stages of crystallization and oxidation of lead and tin

Journal of Crystal Growth (1981)

S. K. Peneva K.D. Djuneva E.A. Tsukeva

Tin oxide

10.1016/0022-0248(81)90088-9

Cite

Citations (10)

Some investigations of the heterojunctions in AIVBIV systems

Thin Solid Films (1980)

K.D. Djuneva S. K. Peneva E.A. Tsukeva I. E. Batov

10.1016/0040-6090(80)90472-1

Cite

Citations (14)

Some reflection high energy electron diffraction and depth-selective Mössbauer spectroscopy investigations on the structures in evaporated thin tin films before and after their heating in vacuum

Thin Solid Films (1984)

S. K. Peneva K.D. Djuneva

Reflection

Low-energy electron diffraction

10.1016/0040-6090(84)90471-1

Cite

Citations (12)

A correlation of the structures of tin in thin films and in liquid state

Acta Crystallographica Section A Foundations of Crystallography (1984)

S. K. Peneva K.D. Djuneva D. Nihtianova

The first near neighbours interatomic distances is observed by HHEED long-range ordered s tructures-LROS, of cl-Sn, and of ~ -Sn thin tin films-TTF,grown from vapours-Peneva,Djuneva,to appear in TSF, <-isomeric shifts of the j'liossbauer spectra +2.2(or +2.8)±0.2mmjs,respectlvely,refered to a 0n0 2 source),correspond to the distances of closest approach-DCA,in molten Sn (:> -Sn.

10.1107/s0108767384094216

Cite

Citations (0)

STRUCTURE OF TIN OXIDE FILMS

Elsevier eBooks (1982)

S. K. Peneva D. Nihtianova R. K. Rudarska K.D. Djuneva I. Z. Kostadinov

Tin oxide

10.1016/b978-0-444-86435-2.50023-6

Cite

Citations (1)

Ëlectrochemically obtained tin – Part I

Zeitschrift für Kristallographie - Crystalline Materials (1992)

S. K. Peneva N S Neykov K.D. Djuneva V. Rusanov

α 2 -Sn, β 2 -Sn and the solid-state transition of α 2 -Sn to β 2 -Sn observed in tin grown by reduction of aqueous solutions of SnCl 2 with Mg are investigated by transmission electron microscopy (TEM) with selected area electron diffraction, Mossbauer spectroscopy and X-ray diffraction. Some data on the structure oftwo tin dioxides grown as additional products during the reduction of SnCl 2 with Mg and Al are included. The low sensitivity of the X-ray diffraction studies towards the α 2 -Sn and its derivates, and towards the unusual SnO 2 structures is also discussed

10.1524/zkri.1992.202.14.191

Cite

Citations (8)

On the possibility to grow thin tin films with unusual tin structures from the vapour

Zeitschrift für Kristallographie (1989)

E.A. Tsukeva E. Tsakin S. K. Peneva K.D. Djuneva

Conditions for vapour growth of tin films containing α2-Sn, a recently observed unusual tin structure, are described. The formation of tin films consisting of unusual tin structures was found to depend on the temperature of the tin source, and on the distance between the tin source and the growing film.

10.1524/zkri.1989.187.1-2.63

Cite

Citations (7)