Development of the phase composition and the properties of Ti2AlC and Ti3AlC2 MAX-phase thin films – A multilayer approach towards high phase purity

2021 ◽  
Vol 537 ◽  
pp. 147864
Author(s):  
Carlos Torres ◽  
Roger Quispe ◽  
Noely Z. Calderón ◽  
Lara Eggert ◽  
Marcus Hopfeld ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Composition ◽  
Max Phase ◽  
Phase Purity ◽  
High Phase Purity ◽  
High Phase

Fe Doped, Dense, High Phase Purity and Nano-Grained Mg0.5zr2(Po4)3 Thin Films

2020 ◽  
Author(s):  
Saiyue Liu ◽  
Chang Zhou ◽  
You Wang ◽  
Eongyu Yi ◽  
Weimin Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Purity ◽  
High Phase Purity ◽  
High Phase

scholarly journals Control of Competing Thermodynamics and Kinetics in Vapor Phase Thin-Film Growth of Nitrides and Borides

2021 ◽  
Vol 9 ◽  
Author(s):  
Isao Ohkubo ◽  
Takashi Aizawa ◽  
Katsumitsu Nakamura ◽  
Takao Mori
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Vapor Phase ◽  
Film Growth ◽  
Thin Film Growth ◽  
High Crystalline Quality ◽  
Phase Purity ◽  
Thermodynamics And Kinetics ◽  
High Phase Purity ◽  
High Phase

Thin-film  growth is a platform technique that allows the preparation of various undeveloped materials and enables the development of novel energy generation devices. Preferred phase formation, control of crystalline orientation and quality, defect concentration, and stoichiometry in thin films are important for obtaining thin films exhibiting desired physical and chemical properties. In particular, the control of crystalline phase formation by utilizing thin-film technology favors the preparation of undeveloped materials. In this study, thin-film growth of transition metal nitride and rare-earth metal boride was performed using remote plasma–assisted molecular beam epitaxy and hybrid physical–chemical vapor deposition techniques, and was successfully achieved by tuning the competition between thermodynamics and kinetics during vapor-phase thin-film growth. Growth conditions of high crystalline quality titanium nitride thin films and high phase purity ytterbium boride thin films were not thermodynamically favorable. Appropriate control of the contribution degree of thermodynamics and kinetics during vapor-phase thin-film growth is crucial for fabricating high phase purity and high crystalline quality thin films.

Growth of cubic InN films with high phase purity by pulsed laser deposition

2009 ◽  
Vol 311 (11) ◽  
pp. 3130-3132 ◽  
Author(s):  
R. Ohba ◽  
K. Mitamura ◽  
K. Shimomoto ◽  
T. Fujii ◽  
S. Kawano ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Phase Purity ◽  
High Phase Purity ◽  
High Phase

High Phase Purity of Large‐Sized 1T′‐MoS 2 Monolayers with 2D Superconductivity

2019 ◽  
Vol 31 (19) ◽  
pp. 1900568 ◽  
Author(s):  
Jing Peng ◽  
Yuhua Liu ◽  
Xiao Luo ◽  
Jiajing Wu ◽  
Yue Lin ◽  
...  
Keyword(s):  
Phase Purity ◽  
2D Superconductivity ◽  
High Phase Purity ◽  
High Phase

Synthesis of NaY zeolite of high phase purity from kaolin

1990 ◽  
Vol 26 (8) ◽  
pp. 397-399 ◽  
Author(s):  
A. V. Takhtamysheva ◽  
L. D. Konoval'chikov ◽  
B. K. Nefedov
Keyword(s):  
Nay Zeolite ◽  
Phase Purity ◽  
High Phase Purity ◽  
High Phase

Synthesis and thermoelectric properties of fine-grained FeVSb system half-Heusler compound polycrystals with high phase purity

2010 ◽  
Vol 43 (41) ◽  
pp. 415403 ◽  
Author(s):  
Minmin Zou ◽  
Jing-Feng Li ◽  
Peijun Guo ◽  
Takuji Kita
Keyword(s):  
Thermoelectric Properties ◽  
Heusler Compound ◽  
Phase Purity ◽  
Fine Grained ◽  
High Phase Purity ◽  
High Phase

scholarly journals Synthesis, extrusion processing and ionic conductivity measurements of sodium β-alumina tubes

2015 ◽  
Vol 9 (3) ◽  
pp. 131-138 ◽  
Author(s):  
Karanja Avinash ◽  
Madireddy Suresh ◽  
Asit Khanra ◽  
Roy Johnson
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Alumina Powder ◽  
Stoichiometric Mixture ◽  
Phase Purity ◽  
Extrusion Processing ◽  
Increasing Trend ◽  
Density Values ◽  
High Phase Purity ◽  
High Phase

Pure and Li-doped sodium ?-alumina (NaMg0.67Al10.33O17) ceramics were prepared from the stoichiometric mixture of raw powders. Pellets and tubes were formed from the precursor (NBA-1S) and preformed sodium ?-alumina powder through compaction and extrusion processing, respectively. The obtained specimens were finally sintered to dense ceramics. The ceramics were comparatively evaluated for their density, microstructure, phase formation and electrical properties. Both tubes and pellets processed with the preformed sodium ?-alumina powder (NBA-2S) showed enhanced densification along with relatively better phase purity and crystallinity. The ceramics prepared from the preformed powder exhibited higher density of 94-95% TD (theoretical densities) in comparison to the ceramics processed from the raw mixture (NBA-1S) with a density of 85-87%TD, which are complemented well through fractographs and microstructures. The ceramics processed using the preformed sodium ?-alumina (NBA-2S) also exhibited high room temperature AC conductivity of 1.77?10-4 S/cm (1MHz) with an increasing trend with temperature. The higher ionic conductivity at all temperatures in NBA-2S than in NBA-1S ceramics can be attributed to the relatively high phase purity, crystallinity and higher density values of NBA-2S ceramics.

scholarly journals Effects of Temperature, Alkali Source, and Mg/Al Ratio on Phase Purity and Yield of Hydrothermal Synthesized Smectites

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 520
Author(s):  
Bing-Sheng Yu ◽  
Yuh-Ruey Wang ◽  
Wei Lo ◽  
Yi-Yu Liu
Keyword(s):  
Ammonia Solution ◽  
Major Type ◽  
Major Research ◽  
Phase Purity ◽  
Taguchi Orthogonal Array ◽  
Numerous Factor ◽  
Effects Of Temperature ◽  
Trioctahedral Smectites ◽  
High Phase Purity ◽  
High Phase

Smectites are a major type of clay minerals. Hydrothermally synthesized smectites have become a major research topic because of the unstable quality or excessive impurity of natural smectites. The high-phase purity and yield of hydrothermally synthesized smectites are vital in advanced industries and materials applications. In this study, a Taguchi orthogonal array was integrated with eight factors to avoid biased experimental results, thus creating relatively robust factor portfolios to investigate the effects of temperature, alkali sources, and the magnesium (Mg)/aluminum (Al) ratio on the phase purity and yield of hydrothermally synthesized smectites. The synthesized environment was mainly established using trioctahedral smectites based on the formula Na2x(Al2(1−x)Mg2x□)Si4O10(OH)2X-ray diffraction and Rietveld refinement were used for the quantitative analysis of the products’ mineral facies and calculating the synthesized smectites’ phase purity and yield. The Taguchi method was employed to calculate each factor’s effect on the product quality. The results indicated that among the numerous factor portfolios, a relatively high temperature, ammonia solution as the alkali source, and a relatively high Mg/Al ratio were conducive to enhanced phase purity and yield of synthesized smectites. The optimized products of the synthesized smectites achieved a phase purity of 92.5% and a yield of 88.3%.

scholarly journals Growth and Characterization ofGe100-xDyx(x≤2)Nanowires

2010 ◽  
Vol 2010 ◽  
pp. 1-6
Author(s):  
K. B. Paul ◽  
G. I. Athanasopoulos ◽  
C. C. Doumanidis ◽  
C. Rebholz
Keyword(s):  
Glassy State ◽  
Theoretical Work ◽  
Vapor Transport ◽  
Step Method ◽  
Phase Purity ◽  
Arc Melting ◽  
Tube Reactor ◽  
Thermodynamic Conditions ◽  
High Phase Purity ◽  
High Phase

Novel semiconducting Germanium-Dysprosium nanowires are fabricated by a combined two-step method, which consists of initial arc-melting of the elemental constituents into a pellet and its heat treatment, followed by thermal vapor transport of the powdered pellet in a tube reactor for fabrication of the nanowires. The nanomaterials are fabricated on gold nucleation seeds on Si/SiO2substrates. The thermodynamic conditions in the reactor are carefully chosen to produce wires with diameters in a narrow, specific range. This nanofabrication method ensures high phase purity and crystallinity of nanowires. Based on the results and theoretical work, it is concluded that the fabricatedGe98Dy2materials are in a glassy state below 20 K.

Selective Crystallization of Aluminophosphate Molecular Sieve with AEL Structure

2018 ◽  
Vol 18 (5) ◽  
pp. 6-11
Author(s):  
M. R. Aglyullin ◽  
Z. R. Khayrullina ◽  
A. V. Fayzullin ◽  
A. I. Petrov ◽  
A. A. Badretdinova ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Ammonium Phosphate ◽  
Industrial Processes ◽  
Crystallinity Degree ◽  
Phase Purity ◽  
Influence Of Temperature ◽  
Selective Crystallization ◽  
High Phase Purity ◽  
Hydrated Oxide ◽  
High Phase

The influence of temperature and ageing of initial aluminophosphate gels on their chemical and phase composition was studied. The hydrated oxide (boehmite) was used as the source of aluminum to prepare gels containing ammonium phosphate, undissolved pseudoboehmite and amorphous aluminophosphate in different proportions. The gel with predominant amorphous aluminophosphate was shown to provide selective crystallization of high phase purity AlPO4-11 with the crystallinity degree close to 100 %. The developed method for preparation of these disperse molecular aluminophosphate sieves AlPO4-11 is a step to crystallization of silicoaluminophosphates SAPO-11 that are promising Russian catalysts for industrial processes of hydroisomerization of n-paraffins used for manufacturing of Arctic diesel fuel, III group oils and isomerization of butenes.

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