Spectroscopic studies of different aluminosilicate structures

Mozgawa, W.; Sitarz, Maciej; Rokita, M.

doi:10.1016/s0022-2860(99)00165-9

Cited by 131 publications

(71 citation statements)

References 2 publications

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“…This band is associated with broken silicon-oxygen (Si-O − ) bridges (22,23). This means that the water saturation caused degradation of silicon-oxygen networkbreaking of silicon-oxygen bridges Si-O-Si (22,23).…”

Section: The Structure Of Brick In the Light Of Middle Infrared Spectmentioning

confidence: 99%

The influence of water saturation on mechanical properties of ceramic bricks – tests on 19th- century and contemporary bricks

et al. 2016

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ABSTRACT:The paper presents test results concerning ceramic bricks produced in 1880's. Bricks were obtained from a building erected as part of Archduke Rudolf barracks in Krakow. The tests helped to specify changes in brick compressive strength and hardness, caused by water saturation in the ceramic material. For comparison purposes, tests were also carried out on contemporary bricks. Tests showed that mechanical properties of the ceramic bricks in the water saturation state were worse than in the dry state. The impact of strong brick moisture on changes of mechanical parameters is essential in terms of safety assessment for brick structures. RESUMEN: El impacto sobre las propiedades mecánicas de la saturación de agua de los ladrillos cerámicos contemporáneos y del siglo XIX.En el artículo se presentan los resultados del estudio de los ladrillos cerámicos producidos en los años 80 del siglo XIX. Los ladrillos se obtuvieron del edificio que forma parte de un conjunto de cuarteles del archiduque Rudolfo en Cracovia en Polonia. En los estudios se han determinado los cambios de la resistencia a la compresión y la dureza de los ladrillos, por efecto de la saturación de agua del material cerámico. A efectos comparativos, se han realizado también estudios de ladrillos producidos en la actualidad. Se ha comprobado que la saturación de agua de los ladrillos cerámicos lleva consigo una considerable disminución de las propiedades mecánicas. Por lo tanto, el impacto de la alta humedad de los ladrillos sobre el cambio de las propiedades mecánicas constituye un factor significativo en la evaluación de la seguridad en las construcciones de ladrillo.

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Section: The Structure Of Brick In the Light Of Middle Infrared Spectmentioning

confidence: 99%

The influence of water saturation on mechanical properties of ceramic bricks – tests on 19th- century and contemporary bricks

et al. 2016

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“…In contrast, most investigators identify a Raman band near 975 cm )1 with a chain like Q 2 silicate structure [14,69,[75][76][77][78][86][87][88][89]91,92] like that of Na 2 SiO 3 ( figure 5, table 2). Likewise, bands near 764 and 706 cm )1 have been associated with Si-O stretching [88] though a d Si-O-Si vibration has also been assigned to 769 cm )1 Raman shift in certain aluminosilicates [90]. A band in the 910-940 cm )1 region that also appears in various calculations of spectra of a fully dissociated, Q 0 type orthogonal [SiO 4 ] 4) monomer ion [14,64] has been assigned to m as Si-O [14,64,88], d O-Si-O [88], and Q 3 type m Si-O-Si [75,79,87] vibrations.…”

Section: Raman Spectramentioning

confidence: 99%

Vibrational spectra and dissociation of aqueous Na2SiO3 solutions

Halász¹,

Agarwal²,

Li³

et al. 2007

Catal Lett

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To facilitate molecular spectroscopic observation of the mysterious transition of dissolved sodium silicate molecules into nanoparticles of desired silica gel and zeolite structures, the IR and Raman spectra of Na 2 H 2 SiO 4 monomers are studied here in details. It is demonstrated that the 3-0.2 mol/L aqueous solutions of Na 2 SiO 3 and Na 2 SiO 3 Â 9H 2 O contain mostly Na 2 H 2 SiO 4 monomers dissociated about 30%-80%, respectively. In contrast to the common belief the Si-O vibrations of these monomers depend on their dissociation level generating FTIR and Raman bands which are frequently associated with polymer silica structures in the current literature. To stay consistent with the molweight and dissociation measurements, these vibrational assignments are revised in this paper. Some unique and unexpected effects of D 2 O used instead of H 2 O as solvent are also reported.

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“…1 summarize the key findings concerning Al 2 O 3 nucleation and growth chemistry on HF-etched Si͑100͒. 10 The initial H/Si surface ͑a͒ is atomically rough ͑exhibiting double-layer roughness͒, with a broad and structured Si-H stretching band centered at 2110 cm Ϫ1 , associated with mono-, di-, and trihydrides, 14 and a weaker band at 2250 cm Ϫ1 arising from oxidized Si-H. 15 10 While oxidized TMA, probably due to gas impurities, leads to the formation of interfacial Si-O-Al bond arrangements ͑800 and 1000-1100 cm Ϫ1 ), 10,18 inadvertent SiO 2 formation is limited to less than 0.25 Å. Once the H/Si͑100͒ surface has been functionalized by TMA, a water pulse ͑e͒ replaces Al-bonded CH 3 ͑but not Si-bonded CH 3 ) by OD and gives rise to subsurface SiO 2 .…”

mentioning

confidence: 99%

Enhanced initial growth of atomic-layer-deposited metal oxides on hydrogen-terminated silicon

Frank

Chabal

Green

et al. 2003

Applied Physics Letters

116

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A route is presented for activation of hydrogen-terminated Si(100) prior to atomic layer deposition. It is based on our discovery from in situ infrared spectroscopy that organometallic precursors can effectively initiate oxide growth. Narrow nuclear resonance profiling and Rutherford backscattering spectrometry show that surface functionalization by pre-exposure to 108 Langmuir trimethylaluminum at 300 °C leads to enhanced nucleation and to nearly linear growth kinetics of the high-permittivity gate dielectrics aluminum oxide and hafnium oxide.

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Spectroscopic studies of different aluminosilicate structures

Cited by 131 publications

References 2 publications

The influence of water saturation on mechanical properties of ceramic bricks – tests on 19th- century and contemporary bricks

The influence of water saturation on mechanical properties of ceramic bricks – tests on 19th- century and contemporary bricks

Vibrational spectra and dissociation of aqueous Na2SiO3 solutions

Enhanced initial growth of atomic-layer-deposited metal oxides on hydrogen-terminated silicon

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