Detailed spectroscopic studies on cornetite from southern shaba, zaire

Ramanaiah, M. Venkata; Ravikumar, R.V.S.S.N.; Srinivasulu, G; Reddy, B. Jagannadha; Rao, P. Sambasiva

doi:10.1080/00150199608213386

Cited by 9 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The band at 950 cm -1 is assigned to symmetric stretching (ν 1 ) of phosphate ion 24 . The vibrational bands at 602, 547 and 519 cm -1 belong to ν 4 mode 23,24 . 484 cm -1 band represents symmetric bending (ν 2 ) of PO 4 3group 25 .…”

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 98%

SPECTRAL CHARACTERIZATIONS OF Cu2+ IONS DOPED CaZn2 (PO4)2 NANOPHOSPHOR

Kumar¹,

Babu²,

Ravikumar³

2019

RJC

View full text Add to dashboard Cite

Cu 2+ ions doped CaZn 2 (PO 4 ) 2 nanophosphor was prepared by solid-state reaction (SSR) method. The synthesized material was studied by different characterization techniques like X-ray diffraction, Fourier Transform Infra Red, optical absorption and Electron Paramagnetic Resonance (EPR) techniques. The diffraction pattern exhibited the prepared sample belongs to the triclinic crystal structure and average grain size of the crystalline sample was determined as 82 nm. From the EPR spectrum, the bonding parameter and the calculated values of spin-Hamiltonian parameters suggest that Cu 2+ ions have rhombically distorted octahedral site symmetry. Absorption spectrum contains four bands observed at 689, 830, 1050, and 1207 nm which are due to the transitions 2 A 1 (d x 2 -y 2 ) → 2 B 2 (d yz ), 2 B 1 (d xz ), 2 A 1 (d xy ) and 2 A 1 (d z 2 ) respectively. The Fourier transformed infra red spectrum exhibited fundamental vibration frequencies of Phosphate (PO 4 3-) ions along with other functional groups.

show abstract

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 98%

SPECTRAL CHARACTERIZATIONS OF Cu2+ IONS DOPED CaZn2 (PO4)2 NANOPHOSPHOR

Kumar¹,

Babu²,

Ravikumar³

2019

RJC

View full text Add to dashboard Cite

show abstract

“…Symmetric stretching vibration (ν 1 ) of phosphate ion occurs at 973 cm −1 [23]. The frequency at 1070 cm −1 belongs to asymmetric stretching (ν 3 ) of PO 4 3− ion [22,24]. The mode appeared at 1390 cm −1 corresponds to C=O stretching [25].…”

Section: Characterization Techniquesmentioning

confidence: 98%

“…In the prepared sample, the vibrational band monitored at 443 cm −1 is related to the symmetric bending (ν 2 ) of PO 4 3− group [21]. The IR band at 592 cm −1 is ascribed to asymmetric bending (ν 4 ) [22,23]. Symmetric stretching vibration (ν 1 ) of phosphate ion occurs at 973 cm −1 [23].…”

Section: Characterization Techniquesmentioning

confidence: 99%

Synthesis and spectral characterizations of VO2+ ions-doped CaZn2(PO4)2 nanophosphor

et al. 2019

Self Cite

View full text Add to dashboard Cite

VO 2+ ions-doped CaZn 2 (PO 4) 2 nanophosphor was prepared through solid-state reaction technique. The synthesized phosphor was subjected to various spectroscopic characterizations such as powder X-ray diffraction (P-XRD), Fouriertransform infrared spectroscopy (FT-IR), optical absorption and electron paramagnetic resonance (EPR). XRD pattern confirmed that the structure of the sample belongs to triclinic system. The average grain size was found to be 82.23 nm. FT-IR spectrum exhibited characteristic vibrational modes of phosphate (PO 4 3−) ion along with other bands. Optical absorption spectrum displayed three peaks at 436, 690 and 827 nm, suggesting C 4v symmetry with crystal field and tetragonal field parameters Dq = 1449, Ds = − 2990 and Dt = 624 cm −1. The g and A values from EPR spectrum are determined as g ║ = 1.9433, g ┴ = 1.9891, A ║ = 171.2 and A ┴ = 73.4 × 10 −4 cm −1. Correlation of optical and EPR data revealed that VO 2+ ions have tetragonally distorted octahedral symmetry and have covalent bonding nature with ligands.

show abstract