Novel Binary Calcia–Alumina Systems for Device Applications

Zahedi, Marjan

doi:10.1166/sam.2009.1033

Cited by 6 publications

(3 citation statements)

References 72 publications

(127 reference statements)

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“…Recently, the possible use of this material in field-effect transistors, light-emitting diodes, and also as emission elements in displays [13,14] has been discussed. In the reviews [15,16], the possible areas of using this material for the creation of components of electronic devices are presented in sufficient detail.…”

Section: Introductionmentioning

confidence: 99%

Electrophysical Properties of Polycrystalline C12A7:e− Electride

et al. 2022

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This article demonstrates the possibility of creating memory devices based on polycrystalline mayenite. In the course of the study, structural characterization (XRD, TEM) of ceramic samples of mayenite was carried out, as well as a study of the spectral (THz range) and electrophysical characteristics. Materials obtained by calcination at high (1360–1450 °C) temperatures in an inert argon atmosphere differ in the degree of substitution of oxygen anions О2− for electrons, as indicated by the data on the unit cell parameters and dielectric constant coefficients in the range of 0.2–1.3 THz, as well as differences in the conducting properties of the samples under study by more than five orders of magnitude, from the state of the dielectric for C12A7:O2− to the conducting (metal-like) material in the state of the C12A7:e− electride. Measurements of the current–voltage characteristics of ceramic C12A7:e− showed the presence of memristive states previously detected by other authors only in the case of single crystals. The study of the stability of switching between states in terms of resistance showed that the values of currents for states with high and low resistance remain constant up to 180 switching cycles, which is two times higher than the known literature data on the stability of similar prototypes of devices. It is shown that such samples can operate in a switch mode with nonlinear resistance in the range of applied voltages from –1.3 to +1.3 V.

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Section: Introductionmentioning

confidence: 99%

Electrophysical Properties of Polycrystalline C12A7:e− Electride

et al. 2022

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“…For instance, this insulating material can be converted to a semiconductor, conductor or superconductor depending on the type of incorporated anions without a significant change in the structure of the lattice [4,5]. This complex oxide is, therefore, gaining much attention in numerous chemical, electronic and optoelectronic applications such as ion conductor, electron donor for chemical syntheses and decomposition reactions, electron field emitter, electron injection layers in organic light-emitting devices, oxidizing/reducing agent, ion emitter, and as a transparent conductive oxide in flat panel displays, solar cells and transparent transistors [6][7][8][9][10]. Such a wide range of applications for C12A7 has led to an increasing demand for the fabrication and characterisation of high quality thin films.…”

Section: Introductionmentioning

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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“…The cages have an entrance of 0.1nm in diameter, which controls the elemental substitution within the cages. Only a limited number of ions meet the criteria to be substituted for the oxygen ions, inducing a wide range of exceptional characteristics into this oxide material [6][7][8]. C12A7 single nanoparticles have been synthesized through different routes including solidstate reaction at high temperature [9] and self-propagating combustion at low temperature [10].…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of crystallisation of sol–gel derived calcia–alumina binary compounds

Zahedi

Roohpour

Ray

2014

Journal of Alloys and Compounds

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In-situ High Temperature X-Ray Diffraction (HTXRD) and Differential Scanning Calorimetric (DSC) studies were performed on a sol-gel derived binary compound of a calcia-alumina (C12A7) system consisting of calcium oxide (CaO) and aluminum oxide (Al 2 O 3) in a ratio of 12:7 for in-situ investigation into the phase transformations under progressively increasing thermal activation from room-temperature to 1200°C. The crystallisation of amorphous samples formulated at room-temperature on magnesium oxide (MgO) single crystal (100) substrates was found to be complete on heat treatment at 1100°C for 3 hours. This observation was further supported by independent Fourier Transform Infrared (FTIR) and Raman Spectroscopies. Values of 348 kJ/mol and 375 kJ/mol were estimated from Kissinger plots for activation energies of crystallisation of CaO and Al 2 O 3 constituents, respectively.

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Novel Binary Calcia–Alumina Systems for Device Applications

Cited by 6 publications

References 72 publications

Electrophysical Properties of Polycrystalline C12A7:e− Electride

Electrophysical Properties of Polycrystalline C12A7:e− Electride

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

Kinetic study of crystallisation of sol–gel derived calcia–alumina binary compounds

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