Professor
of Solid State Physics
Faculty of Science ,
Menofia Univ., EGYPT.
R.El-Mallawany is
a
Professor of Solid State
Physics at the Physics Dept., Faculty of
Science, Menofia Univ., EGYPT since (1994) and began his career in Solid State
Physics from (1973) when he graduated B.Sc.(Alexandria Univ. ).
Also, he finished his M.Sc. and
Ph.D. in Solid State Physics in
(1978) and (1986). He
has received the following fellowship:
He teaches Physics for under and postgraduate students nearly
over 20 Years.
Also, he is advisor & examiner for
25 Ph.D. & M.Sc. thesis
at the
Egyptian and Arab
Universities. He served as a
Research Group Leader for semiconducting tellurite glasses at Menofia Univ.
In the last couple of decades the broad objective of Professor El-Mallawany was to develop New Non-Crystalline
Solids “Semiconducting Tellurite Glasses” by modifying it
with rare earth and transition
metal ions to get a unique
properties. The
research activities were
focused on the coming physical properties: Elastic & Anelastic, Optical,
Electrical, Thermal and Vibrational
have been published in over
than 50 international
paper. The study of the
physical properties of the non crystalline solid is continuing to attract
the attention of many researchers.
This is not only because of the mummeries technical application of
semiconducting glasses, but also because of the fundamental interest in
understanding the microscopic structure.
Since 1986 he presented a papers
and served as session chair, member
of the International Advisory Committee and Egyptian delegate in the
annual international conferences and congresses.
Last ten years El-Mallawany has been invited to gives several seminars in the area of expertise at US Air Force Facilities 1993 &1998: Rome Lab at Massachusetts, center for Glass Research, Alfred Univ., New York and Materials Sci. & Eng. Dept., Univ. of Florida (www.ehis.navy.mil /europram/julaug98/WOScal.htm). Also, he presented a talk about “Tellurite Glasses” at the 8th International Sym. on Halide Glasses, France 1992. He is a member of Materials Research Society, USA,1990 & Arab Materials Science Society, Former,1990. Also, he selected by the International Encyclopedia “Who’s Who in the World” 16th Edition. He is the author the book “ Physics of Solid Material ”, 1996 (Arabic) , and shared in translation of the Arabic copy of “ The World Book Encyclopedia”, the Arabic copy of “Scientific American”. He is a reviewer & contributing Editor at: American Ceramic Society, USA, J. Materials Science, UK, Egyptian Solid State Phys. , Journal and African Correspondent of åkiant journal of Glass and considered one of the "Materials Scientists in EGYPT: (www.wits.ac.za). El-Mallawany has awarded the following awards :
Overseas
Research Students (ORS) Award , UK,1983,
English
Teaching Cooperation
Training Award , UK,1986,
Egyptian
Science Academy
Award, 1990,
Egyptian State Award (Physics), 1994.
Recently, El-Mallawany is the author of :" Tellurite Glasses Handbook, Physical Properties and Data", publish by CRC Press LLC, Florida , USA, ( 2001) as the first and only comprehensive source of the physical properties of this unique material and suggests directions for future research, (www.crcpress.com, chemical engineering), catalog No. 0368, ISBN:0849303680, 500pp.
Publications
:
(
50 Article published in
International Journals & Presented in International Conferences)
:
1-
“The Elastic Behavior of
TeO2 Glass Under
Uniaxial and
Hydrostatic Pressure ”,
E.Lambson,G.Saunders , B.Bridge and R.El-Mallawany , J.Non. Crys. Solids
69 ,117 (1984)
2-
“ A Study of Optical
Absorption in
Tellurite and
Tungsten Tellurite Glasses
”,
S.Al-Ani , C.Hogarth and R.El-Mallawany , J.Mater. Sci. 20 , 661 (1985)
3-
“ IR Spectra , ESR Spectra and Density of
TeO2 –WO3
and TeO2 - ZnCl2
Glasses ” ,
M.El-Zaidia , A.Ammar and
R.El-Mallawany , phys.stat.soli.
(a) 91 , 637 (1985)
4-
“Elastic Behavior Under Pressure of
the Binary Tellurite
Glasses TeO2 –
WO3
and TeO2
- ZnCl2 ”,
R.El-Mallawany
and G.Saunders , J.Mater.
Sci . Lett. 6 ,443 (1987)
5
- “The> Electrical
Conductivity of Pure
and Binary
TeO2 Glasses ”,
R.Hampton , W.Hong ,G.Saunders and
R.El-Mallawany ,J.Non. Cryst. Solids, 94 ,307 (1988)
6-
“ The Dielctric
Properties of
Tellurite Glasses ”,
R.Hampton,W.Hong ,G.Saunders and R.El-Mallawany,Phys. and
Chem. of
Glasses,29,100 (1988)
7-
“Elastic Properties
of Binary ,Ternary
and Quaternary Rare
Earth Tellurite Glasses ”,
R.El-Mallawany and
G.Saunders , J.Mater. Sci.
Lett. 7 ,870 (1988)
8-
“ Theroretical and Experimental
IR Spectra
of Binary
Rare Earth Tellurite Glasses
”,
R.El-Mallawany, Infrared
Phys. 29 ,781 (1989)
9-”Calculated
& Experimental Elastic Moduli of the Commerical Soda Lime Silica Glasses “,
R.El-Mallawany , T.Ramadan and K.Ebrahim ,2.nd Arab
Inter. Conf. On
Materials Sci., EGYPT (1990)
, p.219
10-
“ Quantitative Analysis
of Elastic
Moduli of
Tellurite Glasses ”,
R. El-Mallawany , J.Mater.Res., 5 ,2218 (1990)
11
- “ Preparation and
Chracterization of Binary
OXY - Halide Tellurite Glasses ”,
R.El-Mallawany, Mater.Sci.Fourm.67 ,149 (1991)
12-
“ The Optical Energy gap
of The
Novel Semiconducting Tellurite Glasses ”,
R.El-Mallawany , The VII
Inter.Conf. on the Phys. of Non-
Cryst. Solids , Cabmbridge ,UK, Ed.D.Pye , Taylor & Francis ,276
(1991)
13-
“Is the Superconductor Bi-Ca-Sr-Cu-O Stiff
or Soft “,
R.El-Mallawany , The VII Inter.Conf. on the Phys. of Non-
Cryst. Solids , Cabmbridge ,UK, Ed.D.Pye , Taylor & Francis ,145
(1991)
14-“
Optical Properties
of Tellurite
Glasses ”,
El-Mallawany , J.App. Phys. 72 ,1774, (1992) [1].
15-
“ The Effect Of Gamma
Irradiation on
The Electrical Conductivity
of TeO2 -P2O5
and Bi2O3 -TeO2 -P2O2
Glasses ”,
A.Abdel Kader, A.Higazy R.EL-Mallawany and M.ElKholy ,
Radiation Effects and
Defects in Solids,
124 , 401 (1992).
16-
“ Debye Temperaure
of Tellurite
Glasses ” ,
R. El-Mallawany , phys.stat.
sol. (a) ,130 ,103 (1992).
17-
“ Ultrasonic Detection
of Microphase
Separation in
Tellurite Glasses ”,
R.El-Mallawany , phys.stat. sol. (a) ,133 ,245
(1992).
18-
“ Electrical Transport Properties
in Semiconducting
Tellurite Glasses ”,
R.El-Mallawany , XVI Inter.
Cong. on Glass , Madrid 1992
, Vol.4 ,127.
19-“Structural
and Vibrational
Investigations of
Thermal Properties
of Tellurite Glasses”,
R.El-Mallawany , J.Mater.Res. 7 ,224 (1992)
20-“
Network Structure of Tellurite Phosphate Glasses :Optical Absorption and
IR Spectra”,
A.Abdel Kader, R. El-Mallawany and
M.ElKholy , J.App.Phys. 73 , 71 , (1993)
21-
“ DC. Electrical Conductivity of
Tellurite Phosphate
Glasses ”,
A.Abdel Kader, R. El-Mallawany and
M.ElKholy , J.App.Phys.73,75, (1993)
22-”Longitudinal
Elastic Constants of Tellurite
Glasses “ ,
R.El-Mallawany , J.App.Phys., 73 (10) ,4878 (1993)
23-
“Thermoluminescence Dosimetry of Rare Earth
Doped tellurite
Phosphate Glasses ”,
A.Abdel Kader, R. El-Mallawany and
M.ElKholy , Mater. Chem. and Phys.,36, 365 (1994)
24-
“ Theoretical Analysis
of the
Electrical Properties
of Tellurite
Glasses ”,
R.El-Mallawany , Mater. Chem. and Phys.,37 , 376
(1994)
25-
“Ultrasonic Attenuation
of Tellurite
Glasses ”,
R.El-Mallawany , M.Sidky, A.Kafagy and H.Afifi ,ibid ,37, 197
(1994)
26-
“Elastic Constants
of Semiconducting
Tellurite Glasses ”,
R.El-Mallawany , M.Sidky, A.Kafagy and H.Afifi ,ibid ,37, 295 (1994)
27-
“Theroretical Analysis of Ultrasonic Wave
Attenuation and Elastic Moduli of Tellurite
Glasses ”,
R.El-Mallawany , ibid .,39, 161 (1994)
28-
“ Devitirfication and
Vitrification of Tellurite
Glasses ”,
R.El-Mallawany , J. Mater. Sci. in Electronics
6 ,1 (1995)
29-
“ Some Physical
Properties of
New Oxyfluoride Glasses
”,
R.El-Mallawany , A.Kafagy,M.Ewaida,I.Hagar,M.Poulain and M.Poulain ,
J.Non
-Crys. Solids,
184 ,141 (1995) and
presented in the
9th Inter. Sym.
On Non-Oxide Glasses ,China ,
(1994).
30-
“A.C. Conductivity of
Tellurite Glasses ”,
M.ElKholy and R.El-Mallawany
, Mater. Chem. and Phys.,40, 163
(1995)
31-“
ESR and Electrical Conductivity
Studies of
TeO2 - CeO2 Semiconducting
Glasses ” ,
R.El-Mallawany, Adly El-Said, M.El-Gawad, ibid.,41,87 (1995)
32-“Dielectric
Properties and Polarization of
molybdenum Tellurite
Glasses”,
R.El-Mallawany , L.S.El-Deen and M.Elkholy , J.Material
Sci. 31 ,6339 (1996)
33-
“Low Temperature
Ultrasonic Attenuation
in Tellurite
Glasses ”,
R.El-Mallawany , M.Sidky and H.Afifi ,
Inter. Symposium on
Glass Problems Turkey (1996)
, vol.2 , 208 .
34-
“Elastic Modulus
of Tellurite
Glasses ”,
A.El-Adawi and R.El-Mallawany
, J.Mater.Sci. Lett. 15 ,2065 (1996)
35-
“Ultrasonic Attenuation
at Low
Temperature of
TeO2 - V2O5 Glasses ”,
M.Sidky , R.El-Mallawany , R .Nakhala and A .El-Moneim ,
Phys.stat.
soli. (a) 159 ,397 (1997)
36-
“Ultrasonic Studies of
TeO2 -V2O2
Glasses ”,
M.Sidky, R.El-Mallawany ,R .Nakhala and A .El-Moneim , J.Non Cryst.
Solids,
215,75 (1997)
37
“Calometric Study
on Tellurite
Glasses ”,
R.El-Mallawany, A.Aboushely, A.Rahamni
and E.Yousef ,
Phys.stat.
soli. (a)163,377 (1997)
38-“Radiation
Effect on The Ultrasoic Attenuation & Internal Friction of Tellurite Glasses ”,
R.El-Mallawany , A.Aboushely, A.Rahamni
and E.Yousef ,
Materials Chem . and Physics
, 52 ,161 (1998)
39-”Comparison
between the
Elastic Moduli
of Tellurite
and Phosphate Glasses”,
R.El-Mallawany and A.Abel -Moneim , phys.
stat. solidi (a), 165 (1998)
40-
“ Tellurite Glasses : Part 1 ,
Elastic Properties”, Review
,
R.El-Mallawany , Materials Chem
. and Physics , 53, 93-120 (1998)
41-”Elastic
& Anelastic Priperties of the
New Non-Crystalline Slids : Tellurite Glasses”
R-El-Mallawany , International Conference on Glass , USA 1998
42-“Radiation
Effect on The Ultrasoic Attenuation & Internal Friction
of Tellurite Glasses”,
R.El-Mallawany , A.Aboushely, A.Rahamni
and E.Yousef ,
Materials Chem . and Physics
, 52,161 (1998)
43-
“Tellurite Glasses : Part 2”, Review:
R.El-Mallawany, Materials Chem. and phys., 60,103-131 (1999)
44-“
Infrared and Raman Spectra of New Molybdenum and Tungsten Oxyfluoride Glasses”’
I.Hagar, R.El-Mallawany
and M.Poulain,
J. Mater. Sci. Lett. ,34 , 5163 (1999)
45-
Elastic Moduli of tricomponent
TeO2-V2O5
-Ag2O
Glasses”’
R.El-Mallawany , A.Aboushely, A.Rahamni and E.Yousef ,
J. Mater. Sci. Lett., 19, 409, (2000)
46-“Effect
of Gamma Radiation on The Elastic Moduli of TeO2-V2O5 -Ag2O
Glasses”
R.El-Mallawany , A.Aboushely, A.Rahamni and E.Yousef ,
J. Mater. Sci. Lett.,19,413 (2000)
47-
“Specific Heat Capacity of Semiconducting
Glasses: Binary Vanadiun Tellurite”,
R.El-Mallawany, phys.stat,solidi (a), 177, 439 (2000)
48-
“ Structural Interpretations on Tellurite Glasses
R.El-Mallawany, Materials Chem. and Phys., 63, 109 (2000)
49-
“ Elastic Moduli of Tricomponent
Tellurite Glasses
At Room Temperature”’
R.El-Mallawany , , M.Sidky and H.Afifi
Glastechische,.73, No.3,1 (2000)
50-“Glass Transformation temperature and Stability
of Binary Semiconducting Vanadate
Tellurite Glasses”,
R.El-Mallawany, to
be presented in XIX International Congress on Glass, UK, July 2001.