Table 1: Chemical Composition of prepared glasses (mol. %)
Sample Name
|
B2O3
|
SiO4
|
Bi2O3
|
TiO2
|
Y2O3
|
mol.%
|
G1
|
52
|
12
|
26
|
10
|
0
|
G2
|
52
|
12
|
26
|
8
|
2
|
G3
|
52
|
12
|
26
|
4
|
6
|
G4
|
52
|
12
|
26
|
2
|
8
|
G5
|
52
|
12
|
26
|
0
|
10
|
Table 2: The de-convolution parameter of the infrared spectra of studied glasses (C) is the component band center, and (A) is the relative area (%) of the component band, the area under both (A4, A3), N4 fraction, and B4.
G 1
|
C
|
475.5
|
679.4
|
891.2
|
1065.1
|
-
|
1242.5
|
1359.1
|
-
|
1511.8
|
1648.3
|
A4
|
A3
|
N4
|
B4
|
A
|
6.3
|
10.6
|
20.8
|
17.8
|
-
|
3.4
|
18.6
|
-
|
17.8
|
4.7
|
38.5
|
22.1
|
0.636
|
0.331
|
G 2
|
C
|
446.5
|
679.3
|
898.7
|
1037.6
|
1110.9
|
1244.3
|
1356.3
|
1496.4
|
|
1640.6
|
|
|
|
|
A
|
0.9
|
8.3
|
22.0
|
14.9
|
5.5
|
3.9
|
19.0
|
20.3
|
|
4.1
|
42.5
|
22.9
|
0.649
|
0.338
|
G 3
|
C
|
487.5
|
681.9
|
894.4
|
1043.1
|
1122.0
|
1235.4
|
1360.1
|
-
|
1524.5
|
1653.7
|
|
|
|
|
A
|
10.9
|
8.1
|
21.4
|
10.6
|
9.1
|
4.0
|
17.1
|
-
|
13.5
|
5.4
|
41.1
|
21.1
|
0.661
|
0.344
|
G 4
|
C
|
469.2
|
683.5
|
884.8
|
1035.8
|
1115.0
|
1252.0
|
1370.8
|
-
|
1512.8
|
1632.9
|
|
|
|
|
A
|
0.1
|
8.9
|
20.6
|
15.8
|
10.1
|
4.3
|
19.1
|
-
|
16.1
|
4.9
|
46.50
|
23.41
|
0.665
|
0.346
|
G 5
|
C
|
445.8
|
681.0
|
891.0
|
1036.2
|
1116.4
|
1240.0
|
1336.7
|
1471.7
|
-
|
1636.3
|
|
|
|
|
A
|
1.2
|
9.5
|
18.7
|
14.3
|
7.9
|
6.0
|
13.7
|
26.5
|
-
|
2.3
|
40.94
|
19.68
|
0.675
|
0.351
|
Table 3: Peak assignments for the prepared glasses.
Wavenumber, (cm-1)
|
Vibrational modes
|
~ 3415
|
are accredited to vibrational modes of OH groups.
|
~2853- 2928
|
are accredited to vibrational modes of molecular water
|
~ 2350
|
are accredited to vibrational modes of hydrogen bonding
|
~1500-1650
|
Asymmetric stretching relaxation of B–O bonds of trigonal BO3 units
|
~ 1470 -1496
|
are accredited to the stretches of B-O in BO3 (or BO2O-) groups.
|
~ 1235 - 1360
|
Asymmetric stretching modes of borate triangles BO3 units
|
~ 1189-835
|
Composite of two silicate chains and borate phases
|
~1110 -1116
|
are accredited to vibrations of tetrahedral BO4 groups
|
~1035-1065
|
are due to bending vibrations of pentaborate group
|
~ 884 - 894
|
Si–O–Si network, and diborate linkage, B–O–B networks
|
~ 710 – 705
|
are due to bending vibrations of B-O linkages in the borate units.
|
~ 683
|
Combined vibrations of BO4 and YO6 groups
|
~ 681
|
B–O–B bond-bending vibrations from pentaborate group or bending vibrations of BO3 triangles, and are due to (YO6), (BiO6), and (TiO4)
|
445 - 475 cm-1
|
related to the vibrations of Si-O-Si
|
~ 445
|
Vibration of metal cations such as Y3+ ,Bi3+ and Ti2+
|
Table 4 Thermal parameters of the studied glasses (°C).
S
|
Tp- Tc
|
Hg
|
Δ T
|
Tp
|
Tc
|
T g
|
Sample name
|
3.86
|
29
|
0.13
|
86
|
761
|
732
|
646
|
G 1
|
4.29
|
32
|
0.13
|
87
|
768
|
736
|
649
|
G 2
|
3.88
|
29
|
0.13
|
87
|
767
|
738
|
651
|
G 3
|
4.29
|
37
|
0.12
|
76
|
769
|
732
|
656
|
G 4
|
5.29
|
29
|
0.18
|
121
|
813
|
784
|
663
|
G 5
|
Table 5: The values of sound velocities, and elastic moduli, density, and micro-hardness of glass-ceramics.
micro-hardness
|
density
|
Y
|
K
|
G
|
L
|
vT
|
vL
|
Samples name
|
(GPa)
|
g/cm-3
|
(GPa)
|
(GPa)
|
(GPa)
|
(GPa)
|
(m.s−1)
|
5.2
|
5.1
|
87.7
|
64.9
|
34.4
|
110.8
|
2605
|
4675
|
G 1
|
5.6
|
5.3
|
93.9
|
68.7
|
36.9
|
117.9
|
2635
|
4710
|
G 2
|
6.0
|
5.6
|
101.4
|
74.9
|
39.8
|
127.9
|
2660
|
4770
|
G 3
|
6.1
|
5.8
|
105.1
|
78.4
|
41.2
|
133.3
|
2670
|
4805
|
G 4
|
7.2
|
5.9
|
118.3
|
85.4
|
46.6
|
147.6
|
2805
|
4990
|
G 5
|