Abstract
The form of fluorine in Na2O-NaF-SiO2 slags has been investigated using Fourier transform infrared spectroscopy. Additions of NaF shifted absorption peaks for stretching modes of Si O bonds to higher wavenumbers, where the basicity of (mol-%Na2O)/ (mol-%SiO2 ) was kept constant, and the shift became larger with an increase in the concentration of NaF. This shift can be explained by the change from Si-O to Si-F bonds, with reference to harmonic oscillation theory of diatomic molecules. It is likely that added NaF depolymerises the silicate network to form Si-F bonds in Na2O-NaF-SiO2 slags.
Get full access to this article
View all access options for this article.
References
1.
Mills
K. C.
: ‘Mould powders for continuous casting’ , 6 ; 1995 , Teddington, UK, National Physical Laboratory–Imperial College .
2.
Kozakevitch
P.
: Rev. Met ., 1949 , 46 , 572 .
3.
Susa
M.
Kubota
S.
Hayashi
M.
Mills
K. C.
: Ironmaking Steelmaking , 2001 , 28 , 390 .
4.
Baak
T.
Olander
A.
: Acta Chem. Scand ., 1955 , 9 , 1350 .
5.
Kumar
D.
Ward
R. G.
Williams
D. J.
: Trans. Faraday Soc ., 1961 , 32 , 147 .
6.
Kumar
D.
Ward
R. G.
Williams
D. J.
: Trans. Faraday Soc ., 1966 , 61 , 1850 .
7.
Ito
T.
Yanagase
Y.
Suginohara
Y.
Miyazaki
N.
: J. Jpn Inst. Met ., 1967 , 31 , 290 .
8.
Mitchell
A.
: Trans. Faraday Soc ., 1967 , 63 , 1408 .
9.
Takusagawa
N.
: J. Non-Cryst. Solids , 1980 , 42 , 35 .
10.
Shinmei
M.
Imai
T.
Maekawa
T.
Yokokawa
T.
: Proc 2nd Int. Symp. on ‘Metallurgical slags and fluxes’ , Lake Tahoe, NV , November , 1984 , TMS , 985 .
11.
Tsunawaki
Y.
Iwamoto
N.
Hattori
T.
Mitsuishi
A.
: J. Non-Cryst. Solids , 1981 , 44 , 369 .
12.
Mysen
B. O.
Virgo
D.
: Phys. Chem. Miner ., 1985 , 12 , 77 .
13.
Iguchi
Y.
Yonezawa
K.
Funaoka
Y.
Banya
S.
Nishina
Y.
: Proc 3rd Int. Conf. on ‘Metallurgicalslags and fluxes’ , Glasgow, Scotland , June 1988 , The Institute of Metals , 169 .
14.
Iwamoto
N.
: Trans. Jpn Weld Res. Inst ., 1975 , 4 , 91 .
15.
Iwamoto
N.
Makino
Y.
: J. Non-Cryst. Solids , 1981 , 46 , 81 .
16.
Hayakawa
S.
Nakao
A.
Ohtsuka
C.
Osaka
A.
: J. Mater. Res ., 1998 , 13 , 739 .
17.
Luth
R. W.
: Am. Mineralogist , 1988 , 73 , 297 .
18.
Stebbins
J. F.
Zeng
Q.
: J. Non-Cryst. Solids , 2000 , 262 , 1 .
19.
Zeng
Q.
Stebbins
J. F.
: Am. Mineralogist , 2000 , 85 , 863
20.
Urata
H.
Sasaki
Y.
Ishii
K.
: Curr. Adv. Mater. Process ., 2002 , 15 , 799 .
21.
Mills
K. C.
: ‘The structure of silicate melts’, NPL report DMM(A) 43, National Physical Laboratory, Teddington, UK , 1991 , 60 .
22.
Watanabe
T.
Hayashi
M.
Fukuyama
H.
Nagata
K.
Hayashi
S.
: Curr. Adv. Mater. Process ., 2002 , 15 , 200 .
23.
Kanehashi
K.
Saito
K.
Matsumiya
T.
: Curr. Adv. Mater. Process ., 2002 , 15 , 800 .
24.
Simon
I.
McMahon
H. O.
, J. Am. Ceram. Soc ., 1953 , 36 , 160 .
25.
Toyuki
H.
: Yogyo-Kyokai-Shi , 1977 , 85 , 554 .
26.
Barrow
G. M.
: ‘Introduction to molecular spectroscopy’ , 32 , 42 ; 1964 , New York , McGraw-Hill .
27.
Pauling
L.
: ‘The nature of the chemical bond’ , 3rd edn , 81 , 85 ; 1960 , Ithaca, NY , Cornell University Press .