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Raman Spectroscopy of LiFePO_4 and Li_3V_2(PO_4)_3 Prepared as Cathode Materials

100%

Ziółkowska D., Korona K., Kamińska M., Grzanka E., Andrzejczuk M., Wu S., Chen M.

Acta Physica Polonica A

2011

vol. 120

issue 5

973-975

Structure of samples of lithium iron vanadium phosphates of different compositions were investigated by X-rays, electron microscopy and Raman spectroscopy. The investigated salts were mainly of olivine-like and NASICON-like structures. The X-ray diffraction and the Raman scattering show different crystalline structures, which is probably caused by difference between cores of the crystallites (probed by X-rays) and their shells (probed by the Raman scattering). Most of the Raman spectra were identified with previously published data, however in the samples with high vanadium concentration we have observed new, not reported earlier modes at 835 cm^{-1} and 877 cm^{-1}, that we identified as oscillations related to V_2O_7^{4-} or VO_4^{3-} anions.

Structural and Optical Properties of Boron Nitride Grown by MOVPE

84%

Dąbrowska A., Pakuła K., Bożek R., Rousset J., Ziółkowska D., Gołasa K., Korona K., Wysmołek A., Stępniewski R.

Acta Physica Polonica A

2016

vol. 129

issue 1a

A-129-A-131

Boron nitride layers were grown on sapphire substrate by metal organic vapor phase epitaxy system that was originally designed for growth of GaN. Structures were characterized by scanning electron microscopy, atomic force microscopy, the Raman spectroscopy, absorption and time resolved photoluminescence. Presented results confirm successful deposition of BN layers and gives information about basic properties of the material. The Raman line at 1370 cm^{-1} and absorption edges at 5.6-5.9 eV were observed which is related to hexagonal phase.

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2 Acta Physica Polonica A

1 2016

1 2011

2 Korona K.

2 Ziółkowska D.

1 Andrzejczuk M.

1 Bożek R.

1 Chen M.

1 Dąbrowska A.

1 Gołasa K.

1 Grzanka E.

1 Kamińska M.

1 Pakuła K.

1 Rousset J.

1 Stępniewski R.

1 Wu S.

1 Wysmołek A.

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Raman Spectroscopy of LiFePO_4 and Li_3V_2(PO_4)_3 Prepared as Cathode Materials

Structural and Optical Properties of Boron Nitride Grown by MOVPE