examples of chemical/electronic structure of glass ...inimif/teched/glasscsc/lecture_9_jain.pdf ·...
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1Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Lecture 9Chemical/Electronic Structure of Glass
Syllabus Topic 6. Electronic spectroscopy studies of glass structure
Examples of Chemical/Electronic Structure of GlassImplications for properties
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2Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Examples of applications of XPS
1.Processing
Float glass
Gel to glass transformation
Lecture 9Chemical/Electronic Structure of Glass
Syllabus Topic 6. Electronic spectroscopy studies of glass structure
Supplemental info on Blackboard: XPS of glass by C.G. Pantano
3. Properties
Electrical conductivity / dielectric constant of
sodium aluminosilicate
2. Performance
Corrosion
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3Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Relation between core level BE, atomic charge, and bond ionicity
Brow and Pantano, J. Am. Ceram. Soc. (1986)
Pauling: Ionicity of a bond between A and B:
Net charge on atom A, qA, depends on its formal
charge, QA and all the bonds that it forms i.e.
In various alkali and alkaline earth silicates (Clarke
and Rizkalla, Chem Phys. Lett. (1976)):
Si 2s (or O 1s) BE calculated charge from bonds
that O forms with other metals.
XPS BE gives experimental ionicity of a bond.
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4Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Relative hydrophobicity of two sides of float glass
The formation of SnOH group at the bottom
surface enhances surface OH conc. and
increases hydrophobicity.
Takeda, JNCS 249 (1999) 41-46
F is used as a chemical label for surface OH.
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5Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Are glasses prepared by the melt-quench and sol-gel processes the same?
Si(OC2H5)4 + H2O Si-OH + C2H5OH (1)
Si(OC2H5)4 + HO-Si Si-O-Si + C2H5OH (2)
Si-OH + HO-Si Si-O-Si + H2O (3)
CH3COOLi + H2O Li+ + OH- + CH3COOH (4)
Once the polycondensation reaction is complete, a higher temperature heat treatment of the gel obviously promotes depolymerization reaction by breaking up the Si-O-Si chains:
Si-O-Si + Li+ + OH- Si-O- - Li+ + Si-OH (5)
Hypothesis: Sol-gel glass becomes identical to melt-quench glass upon heating to Tg.
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6Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
O-1s spectra for xLi2O-(1-x)SiO2 system.
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7Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
O-1s spectra for the xLi2O-(1-x)SiO2 system
Theoretical value of n.b.o. mole fraction for x = 15% and 20% glasses is 16% and 22% respectively.
SpecimenBinding energy (eV)
FWHM (eV) Area under the curve (%)
x=15% melt-quench glass
532.9(4)530.9(4)
1.7(4)1.2(9)
88.411.7
x=15% gel at 3000 C 532.8531.1
1.51.4
93.16.9
x=15% gel at 4000 C 532.9530.8
1.91.5
95.15.2
x=15% gel at 5000 C 532.9530.9
1.71.3
94.45.8
x=20% melt-quench glass
533.0(2)531.1(6)
1.6(7)1.5(0)
81.418.9
x=20% gel at 3000 C 532.9531.1
1.71.3
93.07.4
x=20% gel at 4000 C 532.2530.2
1.91.3
93.27.5
x=20% gel at 5000 C 532.9530.8
1.81.4
89.510.9
As T , the structure of
gels → that of the melt-
quench glass but does
not become identical even
on heating above Tg.
Phase separation occurs
in gel much below Tg. It
occurs more readily in
sintered gels than in the
corresponding melt-
quench glass.
Fraction of NBOs, and broad, asymmetric Li (Na) 1s XPS peak, observed in
samples sintered at increasing temperatures.
What could be the basis of these conclusions?
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8Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Weathering of glass
Pantano, Bull Am Ceram Soc.
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9Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Physical properties of xNa2O-yAl(vs. B)2O3-(1-x-y)SiO2
Activation energy of ionic
conductivity.
Excess volume calculated
from density.
Dissolution rate at RT
(different glass series).
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10Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Structure of xNa2O-yAl(or B)2O3-(1-x-y)SiO2
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11Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
O 1s XPS Na2O xAl(or B)2O3(3-2x)SiO2
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12Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
O 1s XPS Na2O xAl(or B)2O3(3-2x)SiO2
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13Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
O 1s XPS Na2O xAl(or B)2O3(3-2x)SiO2
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14Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Intermediate frequency dielectric constant of Na2O xAl(or B)2O3(3-2x)SiO2
Dielectric constant below the optical
frequencies depends on
(a) Electronic polarization
(b) Ionic polarization
Polarization = eNe + iNi
is polarizability and N is #/vol of the
atomic/molecular units.
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15Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
e is calculated
from refractive index
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16Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Ionic polarization
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17Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Ionic polarization in SAS glass
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18Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Na 1s in SAS and SBS glass seriesNa2O xAl(or B)2O3(3-2x)SiO2
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19Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
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20Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Short quiz
1. In angle resolved XPS, with increasing angle between the sample normal and detector, the
probed depth (a) increases, (b) decreases, (c) does not change.
2. In relation to O 1s, the intensity of O 2s core level peak would be (a) higher, (b) lower, (c)
the same.
3. Is the following statement correct? If not, explain what is wrong with it.
The spin orbit splitting of K 2s core level for a potassium silicate glass should be independent
of glass composition.
5. The ratio of O1s peak area for the non-bridging oxygen and bridging oxygen for a xNa2O (1-
x)SiO2 glass is 0.3. What is the value of x?
4. Is the following statement correct? If not, explain what is wrong with it.
The charging of the sample surface would shift the various core levels by practically the same
value.
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21Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Different Aspects of the Static Structure
Physical structurePhysical arrangement of
atoms with respect to
each other (RM-O, M-O2,
CN, etc..)
•Short range order.
•Medium range structure.
Chemical structure•Nature of bonding (covalency,
ionicity, basicity, etc...) between
different kinds of atoms.
•Charge distribution.
Vibrational structure•Bond strength
•Local vibrations of the mobile atom.
•Vibrations of network structural units of small
and medium size.
N a S i B O n B O
R a n d o m n e tw o r k st r u c tu r e o f a s o d iu m s il ic a te g la s s in tw o -d im e n s io n (a f te r W a r r e n a n d B is c o e )
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22Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Elements of (physical) structure‘ - Shelby
1. Coordination of network cations/glass formers: Network building blocks,
Short range order.
2. Bond Angle Distributions
3. Network Connectivity: Linkage of network forming polyhedra. Bridging vs
Nonbridging Oxygens
4. Network Dimensionality: 3D: silica, 2D: B2O3, 1D: polymeric glasses
(NaPO3?)
5. Intermediate Range Order: Linking of polyhedra to form larger, ordered
molecular units- rings, chains- in an otherwise amorphous matrix.
6. Morphology: Phase separation? Network within a network?
7. Interstitial/Free Volume: Related to temperature dependence of properties:
Thermal history effects, Gas diffusion sensitivity
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23Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Important schematics of glass strcuture
N a S i B O n B O
R a n d o m n e tw o r k st r u c tu r e o f a s o d iu m s il ic a te g la s s in tw o -d im e n s io n (a f te r W a r r e n a n d B is c o e )
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24Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Description of Non-crystalline Structure
Average # density o= n/v
Pair distribution function, g(r) = (r)/ o
o g(r)dr is probability of finding an atom
between r and r+dr from origin.
Pair correlation function: h(r) = g(r) – 1
As r→ , h(r)→0 for glass i.e. no
correlation or complete randomness.
Elliott, The Physics and Chemistry of Solids, Wiley, (1998)
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25Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Radial distribution function (RDF):
J(r)= 4 r2 (r) = 4 r2 g(r)
Area under the first peak in J(r) vs r plot
gives the number of NN or the CN.
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26Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide
Varshneya: Fundamentals of Inorganic Glasses, 2006
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27Formation and Structure of Glass Feb 19, 2007. Jain/Lehigh slide