Vibrational Spectra and Structure of Silicates

Лазарев, А. Н.

doi:10.1007/978-1-4899-4803-8

Cited by 165 publications

(191 citation statements)

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“…Thus, the rotation around the Si c -O bonds 1 in TTMS is virtually more unrestricted than in HMDSO. This causes a relatively flexible conformation of TTMS [12]. Consequently, this flexible conformation can play a crucial role for the self-adapted growth of nanostructured films.…”

Section: Introductionmentioning

confidence: 99%

Tetrakis(trimethylsilyloxy)silane for nanostructured SiO2-like films deposited by PECVD at atmospheric pressure

Schäfer

Hnilica

Šperka

et al. 2016

Surface and Coatings Technology

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a b s t r a c t a r t i c l e i n f oPlasma enhanced chemical vapor deposition (PECVD) from tetrakis(trimethylsilyloxy)silane (TTMS) has been studied at atmospheric pressure. TTMS has been chosen because of its unique 3D structure with potential to form nano-structured organosilicon polymers. Despite the widespread surveying of various silicon-organic molecules for PECVD, the use of TTMS in AP-PECVD has not been investigated deeper yet. PECVDs have been performed with two different plasma jets. While they are alike regarding the geometry and injection of TTMS, they differ in input power and excitation frequency. The radiofrequency plasma jet operates at lower power densities as compared to the microwave plasma jet. Despite this all the deposited films exhibit similar chemical properties resembling that of silicon dioxide (Si:O = 1:2) with carbon content below 5%. The films demonstrate a broad variety of morphologies from compact smooth films to nano-dendritic 3D structures depending on the particular process.

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Section: Introductionmentioning

confidence: 99%

Tetrakis(trimethylsilyloxy)silane for nanostructured SiO2-like films deposited by PECVD at atmospheric pressure

Schäfer

Hnilica

Šperka

et al. 2016

Surface and Coatings Technology

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“…All of the bands in the 850 to 1150 cm -1 region are attributed to (SiO 4 ) 4-vibrations. Lazarev in his treatise (Fig.21 p61) shows possible differences in the infrared spectra of the SiO 4 , Si 2 O 7 , Si 3 O 10 type structures 13 . Based on the crystal structure of joaquinite both the first two units occur in the structure and consequently infrared spectra will result from each of the units independently.…”

Section: Resultsmentioning

confidence: 99%

“…There have been two comprehensive treatises on the infrared spectroscopy of silicates 12,13 . All of the bands in the 850 to 1150 cm -1 region are attributed to (SiO 4 ) 4-vibrations.…”

Section: Resultsmentioning

confidence: 99%

“…Lazarev also states that additional bands can be obtained by resonance interactions between translationally non-equivalent (SiO 4 ) 4-tetrahedra. Fermi resonance with overtones and combination bands of the bending and deformation modes may also complicate the spectrum 13 Figure 4. This spectral region is complex and no doubt the number of bands present is due to the reasons listed above.…”

Section: Resultsmentioning

confidence: 99%

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Raman spectroscopy of the joaquinite minerals

Frost

Pinto

2007

J Raman Spectroscopy

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Abstract:Selected joaquinite minerals have been studied by Raman spectroscopy. The minerals are categorised into two groups depending upon whether bands occur in the 3250 to 3450 cm -1 region and in the 3450 to 3600 cm -1 region or in the latter region only. The first set of bands is attributed to water stretching vibrations and the second set to OH stretching bands. In the literature X-ray diffraction could not identify the presence of OH units in the structure of joaquinite. Raman spectroscopy proves that the joaquinite mineral group contain OH units in their structure and in some cases both water and OH units. A series of bands at 1123, 1062, 1031, 971, 912 and 892 cm-1 are assigned to SiO stretching vibrations. Bands above 1000 cm -1 as attributable to ν as modes of the (SiO 4 ) 4-and (Si 2 O 7 ) 6-units. Bands are observed at 738, around 700, 682, around 668, 621 and 602 cm -1 are attributed to O-Si-O bending modes. The patterns do not appear to match the published infrared patterns of either (SiO 4 ) 4-or (Si 2 O 7 ) 6-units. The reason is attributed to the actual formulation of the joaquinite mineral in which significant amounts of Ti or Nb and Fe are found.

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“…The correlation exhibits a definite pattern of relationship. Several authors have used these correlations to calculate the unknown P O P angles in pyrophosphates [36,37] and cyclohexaphosphates [19]. Lazarev, [37] has used similar type of correlations in pyrosilicates and determined the Si O Si angles.…”

Section: Correlation Between the P N P Stretching 6ibrations And The mentioning

confidence: 99%

Vibrational analysis of Ag3(PO2NH)3, Na3(PO2NH)3.H2O, Na3(PO2NH)3.4H2O, [C(NH2)3]3(PO2NH)3.H2O and (NH4)4(PO2NH)4.4H2O

John¹,

Philip²,

Stock³

et al. 2001

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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FT IR and FT Raman spectra of Ag 3 (PO 2 NH), (Compound I), Na 3 (PO 2 NH) 3 4 .4H 2 O (Compound V) are recorded and analyzed on the basis of the anions, cations and water molecules present in each of them. The PO 2 NH − anion ring in compound I is distorted due to the influence of Ag + cation. Wide variation in the hydrogen bond lengths in compound III is indicated by the splitting of the 6 2 and 6 3 modes of vibration of water molecules. The NH 4 ion in compound V occupies lower site symmetry and exhibits hindered rotation in the lattice. The correlations between the symmetric and asymmetric stretching vibrations of P N P bridge and the P N P bond angle have also been discussed.

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Vibrational Spectra and Structure of Silicates

Cited by 165 publications

References 0 publications

Tetrakis(trimethylsilyloxy)silane for nanostructured SiO2-like films deposited by PECVD at atmospheric pressure

Tetrakis(trimethylsilyloxy)silane for nanostructured SiO2-like films deposited by PECVD at atmospheric pressure

Raman spectroscopy of the joaquinite minerals

Vibrational analysis of Ag3(PO2NH)3, Na3(PO2NH)3.H2O, Na3(PO2NH)3.4H2O, [C(NH2)3]3(PO2NH)3.H2O and (NH4)4(PO2NH)4.4H2O

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