Phase Evolution Studies of Various Mullite Gels/Precursors by IR and Raman Spectral Techniques

Basic copper chloride Cu2(OH)3Cl and Cu2(OD)3Cl polycrystalline sample were successfully synthesized in the same single phase of clinoatacamite-structure, and the latter’s mid-infrared absorption spectra (4000-400cm–1) and Raman spectra (4000-95cm–1) were first, to the best of our knowledge, measured respectively by FTIR spectroscopy and Micro-Raman spectroscopy to study the corresponding relationship between their spectral properties and crystal structure. Through the comparative analysis of the four spectra we definitely assign or tentatively suggest the vibration modes of OH/D groups in the trimeric hydrogen bond environment, (H/DO)–Cu–(OH/D), Cl–Cu–Cl. These results can be propitious to their low temperature spectral properties which must help to understand the underlying physics of their exotic geometric frustration phenomenon.

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Structural and luminescent characteristic of Sm3+ doped magnesium sulfide borate red phosphor for white LED

Malaysian Journal of Fundamental and Applied Sciences ◽

10.11113/mjfas.v0n0.690 ◽

2017 ◽

Vol 13 (4) ◽

pp. 807-811

Author(s):

Saddiq Abubakar Dalhatu ◽

Rosli Hussin ◽

Karim Deraman ◽

Bulus Ibrahim ◽

Yamusa Abdullahi ◽

...

Keyword(s):

Red Light ◽

Spectral Studies ◽

White Led ◽

Excitation Spectra ◽

Structural Units ◽

Red Phosphor ◽

Red Led ◽

Raman Spectral ◽

Ir And Raman ◽

Magnesium Sulfide

Polycrystalline compositions based on MgO, SO3 and B2O3 have both scientific and technological importance because of their useful applications. Doping with rare earth elements not only due to a rearrangement in the structure, but also to variation in the luminescence properties. Magnesium sulfide borate doped samarium oxide (MgSBO3:Sm3+) phosphors were prepared by solid state reaction and their structural and luminescence characteristic were studied and reported. IR and Raman spectral studies have been made to explore the presence of functional groups and various structural units in the prepared Polycrystalline. The formation of SO4, BO4, BO3, B-O-B and S-O-B structural units have been investigated. The emission and excitation properties were studied. And the results show that the emission and excitation spectra of these phosphors can be excited by ultraviolet (UV) 341, 370 and 409 nm light, and emit green, yellow and red light with intense peak at 601 nm, which are nicely in accordance with the widely applied near- UV LED chip. The emission intensities of these phosphors were increased with increases doping concentration. Therefore, these phosphors are the promising luminescent material towards white red LED applications.

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Mid-IR and Raman Spectral Properties of Hydroxyl/Deuteroxyl Cobalt Chlorides

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.146-147.1194 ◽

2010 ◽

Vol 146-147 ◽

pp. 1194-1197 ◽

Cited By ~ 1

Author(s):

Xiao Dong Liu ◽

Dong Dong Meng ◽

Xu Guang Zheng ◽

Masato Hagihala ◽

Qi Xin Guo

Keyword(s):

Spectral Properties ◽

Single Phase ◽

Vibration Modes ◽

Mid Infrared ◽

Geometrically Frustrated ◽

Micro Raman Spectroscopy ◽

Geometric Frustration ◽

Infrared Absorption Spectra ◽

Raman Spectral ◽

Ir And Raman

The geometrically frustrated material-deuteroxyl cobalt chlorides Co2(OD)3Cl sample was first, to the best of our knowledge, successfully synthesized in the same single phase as the famous Co2(OH)3Cl, and their mid-infrared absorption spectra (4000-400cm–1) and Raman spectra (4000-95 cm–1) are first, to the best of our knowledge, measured respectively by FTIR spectroscopy and Micro-Raman spectroscopy to study the corresponding relationship between their spectral properties and crystal structure. Through the comparative analysis of the four spectra we definitely assign or tentatively suggest the vibration modes of hydroxyl/deuteroxyl groups in the trimeric hydrogen bond environment, (OH/D)–Co–(OH/D), and (H/D3···Cl)–Co–(Cl···H/D3). These results can be propitious to the low temperature spectral properties of Co2(OH)3Cl and Co2(OD)3Cl which must help to understand the underlying physics of their exotic geometric frustration phenomenon.

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FT-IR AND RAMAN SPECTROSCOPIC STUDY OF Cr2O3-TeO2-B2O3-SrF2 GLASSES

Modern Physics Letters B ◽

10.1142/s0217984906011426 ◽

2006 ◽

Vol 20 (18) ◽

pp. 1107-1114 ◽

Cited By ~ 4

Author(s):

I. ARDELEAN ◽

N. MUREŞAN ◽

P. PǍŞCUŢǍ

Keyword(s):

Spectroscopic Study ◽

Local Structure ◽

Glass System ◽

Spectral Measurements ◽

Structural Units ◽

Raman Spectroscopic ◽

Raman Spectroscopic Study ◽

Ft Ir ◽

Raman Spectral ◽

Ir And Raman

Homogeneous glasses were formed in the Cr 2 O 3- TeO 2- B 2 O 3- SrF 2 system, up to 20 mol% Cr 2 O 3. For these glasses, IR and Raman spectral measurements were carried out in order to elucidate the local structure. The results showed that BO 3 and BO 4 are the main structural units of the glass system and the chromium ions are located in the network. It was evidenced the presence of TeO 3 and TeO 4 units as possible structural units in our glasses.

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Notizen: Tetraphenylphosphonium-octabromodiantimonat, (PPh4)2[Sb2Br8]. Synthese und Kristallstruktur / Tetraphenylphosphonium Octabromodiantimonate, (PPh4)2[Sb2Br8]. Synthesis and Crystal Structure

Zeitschrift für Naturforschung B ◽

10.1515/znb-1985-0423 ◽

1985 ◽

Vol 40 (4) ◽

pp. 562-564 ◽

Cited By ~ 16

Author(s):

Abdulalah T. Mohammed ◽

Ulrich Muller

Keyword(s):

Crystal Structure ◽

Crystal Packing ◽

Crystal Data ◽

X Ray Diffraction ◽

Triclinic Space Group ◽

Synthesis And Crystal Structure ◽

X Ray ◽

Raman Spectral Data ◽

Raman Spectral ◽

Ir And Raman

(PPh4)2[Sb2Br8] can be prepared from SbBr3 and PPh4Br in CH2Br2 or from Sb2S3, PPh4Br and HBr in 1,2-dichloroethane. Its crystal structure was determined with X-ray diffraction data (2764 observed reflexions, R = 0.039). Crystal data: triclinic, space group P1̄, a = 1024.9. b = 1127.1, c = 1282.4 pm, α = 111.80, β = 94.52, γ = 106.92°, Z = 1. The centrosymmetric [Sb2Br8]2- ions consist of two square pyramids sharing a basal edge. The cations are grouped to (PPh4+)2 pairs similarly as in (PPh4)2[As2Cl8]; although the latter compound has a comparable general crystal packing, it is not isotopic. IR and Raman spectral data are reported.

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Electron paramagnetic resonance, optical absorption, IR and Raman spectral studies on pelecypod shell

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2007.02.025 ◽

2008 ◽

Vol 69 (2) ◽

pp. 503-508 ◽

Cited By ~ 4

Author(s):

S. Lakshmi Reddy ◽

K.N.M. Reddy ◽

G. Siva Reddy ◽

B.J. Reddy ◽

R.L. Frost ◽

...

Keyword(s):

Electron Paramagnetic Resonance ◽

Optical Absorption ◽

Spectral Studies ◽

Paramagnetic Resonance ◽

Electron Paramagnetic ◽

Raman Spectral ◽

Ir And Raman

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Spectroscopic Analysis on the National-Level Combination Medicine Biqi Capsule

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.791-793.236 ◽

2013 ◽

Vol 791-793 ◽

pp. 236-239

Author(s):

Bing Yang Liu ◽

Man Xing ◽

Yu Shu Bai ◽

Lei Dong ◽

Sen Wang ◽

...

Keyword(s):

Active Ingredient ◽

Spectroscopic Method ◽

National Level ◽

Drug Identification ◽

Toxic Drug ◽

Raman Spectral Data ◽

Ir Spectroscopic ◽

Raman Spectral ◽

Cover Up ◽

Ir And Raman

Fourier transform (FT) infrared (IR) and Raman spectra of powders in the Biqi capsule, a commercially available national-level combination medicine, are measured to check the information on the most important active ingredient strychnine, which is in fact a highly toxic drug. Referring to the published FTIR absorption and FT Raman spectral data, from our ones we have found that the active ingredient - strychnine in our purchased Biqi capsule really exists and its net content is really not so high and therefore may not cause a serious harm to patients if an approved dosage is eaten. From this study one can see that the IR spectroscopic method is more suitable for this kind of drug identification than the Raman one using the Raman spectroscope in this experiment because strong fluorescent signals excited by lasers on the pharmaceutical excipients and other subordinate active ingredients generally cover up the fingerprint signals of the active ingredient in the drug.

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