Optical absorption in solution processed thin films of calcia–alumina binary compounds

Zahedi, Marjan; Ray, Asim K.

doi:10.1007/s10971-010-2255-0

Cited by 6 publications

(8 citation statements)

References 13 publications

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“…1. The result of the analysis confirms the formation of C12A7 on MgO single crystal and the diffraction peaks match well with previous reports [13,14]. The crystallographic plane corresponding to each diffraction peak of C12A7 is also indexed.…”

Section: Resultssupporting

confidence: 89%

Extraction of the optical parameters of sol–gel processed 12CaO·7Al2O3 thin film for optoelectronic applications

Feizi

Ray

2015

J Mater Sci: Mater Electron

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Optical constants refractive index and extinction coefficient of sol-gel processed polycrystalline 12CaOÁ7Al 2 O 3 (C12A7) thin films with crystallite grain of 57 nm in size have been determined from optical transmittance and reflectance spectra experimentally obtained at normal incidence and the averaged value of refractive index below the band edge was found to be *2.15. The dispersion relation between refractive index and incident wavelength was examined in terms of both Cauchy-Sellmeier and single-effective oscillator models. The relation between refractive index and band gap energy at different temperatures in the range of 25-300°C was studied. The refractive index showed a positive temperature dependency in the studied temperature range.

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Section: Resultssupporting

confidence: 89%

Extraction of the optical parameters of sol–gel processed 12CaO·7Al2O3 thin film for optoelectronic applications

Feizi

Ray

2015

J Mater Sci: Mater Electron

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“…Optical properties of those films and powders were studied using atomic force microscopy and UV-visible spectroscopy. Zahedi et al 18 studied optical absorption in solution and processed thin films of calcia-alumina binary compounds. They took a photograph of C12A7 film heat-treated at 1100°C in three dimensions via AFM.…”

Section: Preparation Methodsmentioning

confidence: 99%

“…Many works have then been devoted to further characterize C12A7 and its derivatives for practical applications with significant achievements, 8,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] including, for example, photo-induced electrical conduction 8 and luminescence properties. 26 Despite the fact that some characteristics of C12A7 being reviewed recently by Kim et al 28,29 with focus on fabrication and properties of fantastic C12A7-e À electride, plus a few derivatives, and partial phase diagram of relevance, it is far away from completion to provide a whole picture of material database.…”

Section: Introductionmentioning

confidence: 99%

Characteristics, Thermodynamics, and Preparation of Nanocaged 12CaO·7Al₂O₃ and Its Derivatives

Liao

Chen

Guang-rong

et al. 2016

Int J Applied Ceramic Tech

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Crystal structures, characteristics, and preparations of 12CaO·7Al2O3 family and CaO–Al2O3 (C–A) system have been reviewed in detail with relevant thermodynamic parameters being assessed or recalculated. 12CaO·7Al2O3 (shortened as C12A7) can form several derivatives of type C12A7:Mn− or C12A7–Mn− through replacing so‐called “free oxygen ion” by many anions including OH−, H−, O−, O2−, F−, Cl−, and e− in their cages, or being adopted by rare earth metals or alkaline earth metal oxides at cation sites (Ca2+ or Al3+). These doped C12A7 derivatives show unique material properties of transparent conduction, catalysis, and antibacterial with potential applications in fast ion conductors, optoelectronics, oxidants, and catalysts etc.

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“…However, the presence of extra-framework species has a significant effect on the absorption edge. The absorption edge is shifted to lower energy values as a result of transition from an occupied state of the species to the framework conduction band [25].…”

Section: Room Temperature Absorption Spectrummentioning

confidence: 99%

High temperature optical absorption investigation into the electronic transitions in sol–gel derived C12A7 thin films

Feizi

Ray

2015

J Mater Sci: Mater Electron

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Optical absorption into 6 mm thick sol-gel derived films, annealed at 1300°C of 12CaOÁ7Al 2 O 3 calcium aluminate binary compound on MgOh100i single crystal substrates was studied at temperatures ranging from room temperature to 300°C. Experimental data were analysed in both Tauc and Urbach regions. The optical band gap decreased from 4.088 eV at 25°C to 4.051 eV at 300°C, while Urbach energy increased from 0.191 eV at 25°C to 0.257 eV at 300°C. The relationship between the optical band gap and the Urbach energy at different temperatures showed an almost linear relationship from which the theoretical values of 4.156 and 0.065 eV were evaluated for the band gap energy and Urbach energy of a 12CaOÁ7Al 2 O 3 crystal with zero structural disorder at 0 K.

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Optical absorption in solution processed thin films of calcia–alumina binary compounds

Cited by 6 publications

References 13 publications

Extraction of the optical parameters of sol–gel processed 12CaO·7Al2O3 thin film for optoelectronic applications

Extraction of the optical parameters of sol–gel processed 12CaO·7Al2O3 thin film for optoelectronic applications

Characteristics, Thermodynamics, and Preparation of Nanocaged 12CaO·7Al₂O₃ and Its Derivatives

High temperature optical absorption investigation into the electronic transitions in sol–gel derived C12A7 thin films

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Optical absorption in solution processed thin films of calcia–alumina binary compounds

Cited by 6 publications

References 13 publications

Extraction of the optical parameters of sol–gel processed 12CaO·7Al2O3 thin film for optoelectronic applications

Extraction of the optical parameters of sol–gel processed 12CaO·7Al2O3 thin film for optoelectronic applications

Characteristics, Thermodynamics, and Preparation of Nanocaged 12CaO·7Al2O3 and Its Derivatives

High temperature optical absorption investigation into the electronic transitions in sol–gel derived C12A7 thin films

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Product

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Characteristics, Thermodynamics, and Preparation of Nanocaged 12CaO·7Al₂O₃ and Its Derivatives