Growth, EPR and optical absorption spectra of l-threonine single crystals doped with Cu2+ ions

Santana, Ricardo Costa de; Cunha, R. O.; Santos, Midiana Gusmão dos; Ferreira, K.D.; Carvalho, J. F.; Calvo, Rafael

doi:10.1016/j.jpcs.2007.01.043

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…The g and A values in this spectra are found to be g 1 = 2.39, A 1 = 14.9 mT and g 2 = 2.08, A 2 = 1.9 mT. They are in agreement with the literature values for Cu 2+ -doped single crystals (7)(8)(9)(10). This figure and further investigations on the EPR spectra do not show any appreciable variation other than a very weak line broadening.…”

Section: Resultssupporting

confidence: 91%

Phase transition in Cu²⁺-doped RbH₂ PO₄ as observed by EPR

Demir

Köksal

Köşeoğlu

2009

Radiation Effects and Defects in Solids

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The electron paramagnetic resonance (EPR) spectra of Cu 2+ -doped RbH 2 PO 4 at elevated temperatures indicate a phase transition at 358 K. The EPR-silent state at this temperature is attributed to a so-called polymeric phase transition. After the transition when the temperature is lowered to 293 K, the EPR signal does not appear; therefore, the transition is irreversible. This result seems to be in agreement with the other observations. The EPR spectra for the sample indicate the presence of two sites for Cu 2+ , and the values of EPR parameters are in accord with the literature on Cu 2+ -doped single crystals. Any other phase transitions could not to be observed at low temperatures down to 113 K.

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Section: Resultssupporting

confidence: 91%

Phase transition in Cu²⁺-doped RbH₂ PO₄ as observed by EPR

Demir

Köksal

Köşeoğlu

2009

Radiation Effects and Defects in Solids

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“…The optical property displays some specific features, such as a wide transparency range in the Vis and UV spectral region, and favors crystal hardness. These properties are useful for applications in the field of telecommunications, optical information storing devices and potential material in laser systems [2][3][4][5]. The performance of the nonlinear property of dimethyl urea is evaluated through a second harmonic generation (SHG) test and its nonlinear property is nearly 1.5 times that of potassium dihydrogen phosphate (KDP).…”

Section: Introductionmentioning

confidence: 99%

“…Investigations concerning the growth, structure, thermal, optical and mechanical properties, vibrational spectroscopy, effect of pH value and specifically SHG of l-threonine crystals have been reported by many researchers [7][8][9][10][11][12][13]. Santana et al [2] reported the growth and electron paramagnetic resonance absorption spectra of l-threonine single crystals doped with Cu 2+ ions. The structural characteristics and SHG in l-threonine crystals grown in acetic acid solution was done by Suresh Kumar et al [14], and it was observed that the SHG efficiency and other properties are altered when l-threonine crystals are grown in an acetic acid solution.…”

Section: Introductionmentioning

confidence: 99%

Optical, mechanical and thermal characterization of l-threonine single crystals grown in dimethyl urea solution

Shanthi

Krishnan

Selvarajan³

2013

Phys. Scr.

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An organic material of a noncentrosymmetric l-threonine single crystal was grown in a dimethyl urea solution using the slow evaporation method. The grown crystal was transparent and colorless, with a size of about 20 × 7 × 4 mm3, obtained within a period of 10 days. The grown crystal was subjected to various studies, such as x-ray diffraction (XRD), Fourier transform infrared (FTIR), microhardness, ultraviolet–visible (UV–Vis) transmittance, thermogravimetric analysis and differential thermal analysis (TGA/DTA) and second harmonic generation (SHG). l-threonine crystals grown in a dimethyl urea solution show relative SHG efficiency of 0.92 times that of potassium dihydrogen phosphate. The functional groups of the crystals have been confirmed by FTIR analysis. The mechanical strength of the crystal was estimated by the Vickers hardness test. The lattice parameters of the grown crystal were determined by single crystal XRD and powder XRD studies, and the diffraction peaks were indexed. A UV–Vis spectrum was recorded in the wavelength range of 200–1100 nm to find the suitability of the crystal for nonlinear optical applications. The thermal stability of l-threonine crystal grown in dimethyl urea was checked using the TGA/DTA analysis.

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“…A study of partial replacement of the Te ions in the Bi6Te2-xRxO13 (R = Ti, Si and Ce) composition was done in order to minimize or avoid the oxidation of Te 4+ to Te 6+ during the cubic/orthohrombic phase transition. The addition of intentional impurities in crystalline compounds is an important tool in the materials chemistry and the object of numerous studies [13][14][15][16][17][18][19][20][21][22][23][24], in particular, there was an investigation of the stabilization of this cubic phase (Bi6Te2O13) at room temperature by replacing Bi ions [24]. Here, Ti, Si and Ce ions have been chosen to replace Te ion site because all of these ions present the same oxidation state (IV) and ionic radius close.…”

Section: Introductionmentioning

confidence: 99%

Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

Ferreira¹,

Gasparatto²,

Viajante³

et al. 2021

REPQJ

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In recent years, the increase of economic and environmental problems related to energy generation has increased researches at renewable energy sources. Among others, the fuel cells excel as promising alternative technology of electricity generation and materials science is an ally in the search for better and more efficient materials for this application. In particular, solid-state ionic conductors represent functional materials with promising advantages for fuel cells, as is the case of Bi2O3-based oxygen ion conductors, however, they need to have its cubic phase stabilized at room temperature. This paper presents a study of the Bi6Te2-xRxO13 (R = Ti, Si and Ce) systems for such an application. Solid state reaction was used to materials synthesis. The 3Bi2O3:2TeO2 system present two phases, an orthorhombic one (Bi6Te2O15) stable at room temperature and another high temperature cubic (Bi6Te2O13). Experiments of substitution of Te ions by Ti, Si and Ce ions using the Bi6Te2- xRxO13 matrix were done intending to stabilize the cubic phase at room temperature and the results are presented as well as discussed here

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Growth, EPR and optical absorption spectra of l-threonine single crystals doped with Cu2+ ions

Cited by 8 publications

References 22 publications

Phase transition in Cu²⁺-doped RbH₂ PO₄ as observed by EPR

Phase transition in Cu²⁺-doped RbH₂ PO₄ as observed by EPR

Optical, mechanical and thermal characterization of l-threonine single crystals grown in dimethyl urea solution

Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

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Growth, EPR and optical absorption spectra of l-threonine single crystals doped with Cu2+ ions

Cited by 8 publications

References 22 publications

Phase transition in Cu2+-doped RbH2 PO4 as observed by EPR

Phase transition in Cu2+-doped RbH2 PO4 as observed by EPR

Optical, mechanical and thermal characterization of l-threonine single crystals grown in dimethyl urea solution

Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

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Phase transition in Cu²⁺-doped RbH₂ PO₄ as observed by EPR

Phase transition in Cu²⁺-doped RbH₂ PO₄ as observed by EPR