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Single crystal

About: Single crystal is a research topic. Over the lifetime, 59617 publications have been published within this topic receiving 870828 citations.


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TL;DR: In this article, the electronic states of anatase were calculated by using a cluster model with a size of Ti 5 O 14, where the transition from O(2 p ) orbitals to Ti(4 s, 4 p ) ones was observed in the energy region from 3 to 12 eV and the vague structures in the higher energy region (>12 eV were clearly distinguished in spectra from the low energy part.
Abstract: Polarized Reflection spectra of single-crystal anatase TiO 2 were measured in a photon energy range from 2 to 25 eV using synchrotron orbital radiation. Dielectric constants and absorption spectra were obtained from reflection spectra by Kramers-Kronig transformations. To interpret the structures that were observed in the spectra, the electronic states of anatase were calculated by using a cluster model with a size of Ti 5 O 14 . The structures observed in the energy region from 3 to 12 eV can be identified primarily due to the transition from O(2 p ) orbitals to Ti(3 d ) ones. The polarization dependence of the spectra in the above energy region is also effectively exhibited by the calculations from this model. The vague structures in the higher energy region (>12 eV) which can be clearly distinguished in spectra from the low energy part are due to the transition from O(2 p ) orbitals to Ti(4 s , 4 p ) ones.

121 citations

Journal ArticleDOI
TL;DR: Anisotropic uniform single-crystal nanostructures of α-MoO3 have been synthesized successfully via a novel green and facile approach, i.e., decomposition and condensation of peroxomolybdic acid under hydrothermal conditions as mentioned in this paper.
Abstract: Anisotropic uniform single-crystal nanostructures of α-MoO3 have been synthesized successfully via a novel green and facile approach, i.e., decomposition and condensation of peroxomolybdic acid under hydrothermal conditions. The structure and morphology of the products were characterized by means of X-ray diffraction, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, scanning electron microscopy, thermogravimetric/differential thermal analysis, temperature programmed decomposition-mass spectrometry, and Fourier transform infrared spectroscopy. It has been found that the formation of α-MoO3 proceeds at hydrothermal temperatures higher than 83.5 °C and that of MoO2.67(O2)0.33·0.75H2O is at 81.5 °C with the 0.9 mol/L molybdenum solution. The as-synthesized uniform nanostructures grow preferentially along [001], and the dimensions are 200−330 nm in width, 60−90 nm in thickness, and up to 10 μm in length during time spans from 20 to 45 h at ...

121 citations

Journal ArticleDOI
TL;DR: In this paper, the ultraviolet edge spectrum of pure single crystal SnO 2 has been obtained at 300° K to absorption coefficients as high as 10 3 cm −1, and the use of polarized light revealed a large dichroism, the absorption edges differing by ca 0.3 eV for radiation polarized parallel and perpendicular to the crystal axis.

121 citations

Journal ArticleDOI
TL;DR: Tris (thiourea) zinc sulphate (ZTS), a semiorganic nonlinear optical (NLO) material has been synthesized at 30 °C as discussed by the authors.
Abstract: Tris (thiourea) zinc sulphate (ZTS), a semiorganic nonlinear optical (NLO) material has been synthesized at 30 °C. The solubility was determined in different solvents such as water, ethanol and water mixture of ethanol (1:1). Good quality single crystals with size 10 × 8 × 6 mm3 were grown by slow evaporation technique within three weeks with approximate growth rate of 0.5 mm/day. The grown crystals have been subjected to single crystal X-ray diffraction to determine the unit cell dimensions and morphology. The TGA and DTA reveal that the material has good thermal stability. The UV-Vis spectrum shows that the material has wide optical transparency in the entire visible region. The second harmonic generation was confirmed by Kurtz powder method. The birefringence of the crystal was measured in the visible region and it was found to vary with the wavelength. The microhardness test was carried out in (100) plane and the load dependent hardness was measured. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

121 citations

Journal ArticleDOI
TL;DR: In this paper, the structure of the Ni2MnGa and Ni2mn1.8 thin films has been characterized by molecular beam epitaxy on GaAs (001) substrates with Sc0.3Er0.7As interlayers.
Abstract: Epitaxial Ni2MnGa and Ni2Mn1.2Ga0.8 thin films have been grown by molecular beam epitaxy on GaAs (001) substrates with Sc0.3Er0.7As interlayers. Structural characterization of as-grown films confirms the epitaxially stabilized single crystal structure of the films and indicates that the films grow pseudomorphically on GaAs (001) substrates in a tetragonal structure (a=b=5.65 A, c=6.18 A). The films are ferromagnetic at room temperature with coercivity of ∼50 Oe, saturation magnetization of ∼250 emu/cm3, and weak in-plane magnetic anisotropy. The Curie temperature of the films is found to be ∼340 K. However, while the films were attached to the substrate martensitic phase transformations were not observed. In order to observe martensitic phase transformations, free-standing Ni2MnGa bridges and cantilevers were fabricated using front and back side photolithography together with a combination of dry and wet etching. After removal of the substrate, the free-standing bridges and cantilevers showed a unique temperature dependent shape. Observation using a polarized-light optical microscope during repeated thermocycling showed large movement of the cantilevers, confirming a two-way shape memory effect in the free-standing films. Using 100 μm long free-standing bridges, field induced strain or the ferromagnetic shape memory effect was observed in a stoichiometric Ni2MnGa sample at 135 K with the magnetic fields perpendicular to the sample surface.

121 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023485
20221,042
20211,353
20201,795
20191,797
20181,782