Die Konstitution der Mischkristalle und die Raumf�llung der Atome

Vegard, L.

doi:10.1007/bf01349680

Cited by 3,523 publications

(1,705 citation statements)

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“…The Brillouin zone integration was sampled with Γ-point only. As expected, the calculated alloy lattice constant follows the Vegards rule [16]. In a perfectly random alloy A x B 1−x C, the probability of finding a C site with the first-neighbor motif A n B 4−n is p n (x) = C n 4 x n (1 − x) 4−n .…”

supporting

confidence: 79%

Bowing of the defect formation energy in semiconductor alloys

Ma¹,

Wei²

2013

Phys. Rev. B

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supporting

confidence: 79%

Bowing of the defect formation energy in semiconductor alloys

Ma¹,

Wei²

2013

Phys. Rev. B

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“…Several [54]. The lattice expansion obeys Vegard's law [54,70] previous works have focused specifically on the difference in local structure with and without Ce 3? doping.…”

Section: Garnet Type Host Lattices and Yag:ce 31mentioning

confidence: 99%

Inorganic Phosphor Materials for Lighting

2016

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This chapter addresses the development of inorganic phosphor materials capable of converting the near UV or blue radiation emitted by a light emitting diode to visible radiation that can be suitably combined to yield white light. These materials are at the core of the new generation of solid-state lighting devices that are emerging as a crucial clean and energy saving technology. The chapter introduces the problem of white light generation using inorganic phosphors and the structureproperty relationships in the broad class of phosphor materials, normally containing lanthanide or transition metal ions as dopants. Radiative and non-radiative relaxation mechanisms are briefly described. Phosphors emitting light of different colors (yellow, blue, green, and red) are described and reviewed, classifying them in different chemical families of the host (silicates, phosphates, aluminates, borates, and non-oxide hosts). This research field has grown rapidly and is still growing, but the discovery of new phosphor materials with optimized properties (in terms of emission efficiency, chemical and thermal stability, color, purity, and cost of fabrication) would still be of the utmost importance.

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“…% nitrogen in titanium without any formation of a stable phase and the variation of the lattice parameter as a function of the nitrogen content in δ-TiN x are important factors for the present investigations. According to Vegard's law [17], the latter relation is given by (2), based on the experimental data [18] for cubic TiN.…”

Section: 1mentioning

confidence: 99%

“…Furthermore, the nitrogen content in the coatings increases as a result of optimal diffusion conditions. 17 Grain size distribution for all the samples and the dependence on the overlap parameter (WHP analysis) FIGURE 18 Maximal lattice strain for all the samples and the dependence on the overlap parameter (WHP analysis)…”

Section: 2mentioning

confidence: 99%

Microstructure of TiN coatings synthesized by direct pulsed Nd:YAG laser nitriding of titanium: Development of grain size, microstrain, and grain orientation

et al. 2008

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Pure titanium was irradiated by pulsed Nd:YAG laser irradiation in nitrogen atmosphere. As a result, nitrogen uptake and diffusion occurred and a TiN layer was synthesized at the titanium surface. These TiN coatings were analyzed by X-ray diffraction and the diffraction patterns were investigated in detail, in order to obtain more information about the physical processes during the coating formation. The diffraction peaks were fitted by Pearson VII profiles and the grain size and the microstrain were determined by the analysis of line broadening and peak shifts, using the Williamson-Hall and the Warren-Averbach formalisms. Additional single-line analyses were performed by means of the method of Langford and Keijser to obtain information about the preferred grain orientation and the texture development. The maximum grain size was about 100 nm and a corresponding average lattice strain of 0.002 was found. A relation between the treatment parameters and the coating properties, such as grain size and microstrain, can be shown. Thus, it was possible to determine optimal scan parameters for material processing and to establish the physical limits of the coating properties.PACS 81.65.Lp; 81.15.Fg; 61.10.Nz; 68.55.Jk IntroductionNitriding and carburizing of metals are well known techniques to improve the tribological properties like hardness and wear resistance of technical surfaces [1]. As an example, plasma-and gas nitriding are established methods for surface treatment [2,3]. Alternatively, it is possible to treat the surface with laser radiation and to directly synthesize hard coatings [4][5][6][7][8]. Previous works have shown the successful synthesis of titanium nitride with laser irradiation [9][10][11]. Here, a Q-switched Nd:YAG laser was used for the nitriding treatment. The main advantages of this method are a reduction of the processing time and the negligible heat load for the workpiece. Stress, microstrain and inhomogeneity remain the main problems. Also the texture of cubic titanium nitride is a decisive factor for the technical quality of the coatings, as the u Fax: +49-551-39-4493, E-mail: pschaaf@uni-goettingen.de texture influences strain development and finally crack formation and propagation. Some investigations on texture and strain development in relation to the process parameters have been reported in the literature [12][13][14].This work resolves the resulting grain size and strain development and relates them to laser treatment parameters like scan parameters. In this way, one can try to predict optimum treatment parameters for optimum coating properties, i.e. find parameters that minimize the lattice strain in order to reduce crack formation and propagation. Experiments 2.1 Sample treatmentConventional α-titanium (purity > 99.98%) was used for the treatments. Titanium sheets of 1 mm thickness were cut into pieces of 15 × 15 mm 2 and used in the asreceived state without any further treatment.For laser nitriding, the samples were placed in a chamber which was first evacuated and then fil...

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Die Konstitution der Mischkristalle und die Raumf�llung der Atome

Cited by 3,523 publications

References 0 publications

Bowing of the defect formation energy in semiconductor alloys

Bowing of the defect formation energy in semiconductor alloys

Inorganic Phosphor Materials for Lighting

Microstructure of TiN coatings synthesized by direct pulsed Nd:YAG laser nitriding of titanium: Development of grain size, microstrain, and grain orientation

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