Role of f-electrons in determining insulator to metal phase transitions of Ca(La1−xCex)2S4 (0 ≤ x ≤ 1) solid solution: A DFT + U study

2021 ◽  
Vol 130 (14) ◽  
pp. 145102
Author(s):  
Hori Pada Sarker ◽  
Muhammad N. Huda
Keyword(s):  
Solid Solution ◽  
Phase Transitions ◽  
Metal Phase

Effects of Rhenium Alloying on the Microstructures and Mechanical Properties of Directionally Solidified NiAl-Mo Eutectic Alloy

1996 ◽  
Vol 460 ◽  
Author(s):  
A. Misra ◽  
Z. L. Wu ◽  
R. Gibala
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Eutectic Alloy ◽  
Substitutional Solid Solution ◽  
Growth Direction ◽  
Metal Phase ◽  
Directionally Solidified ◽  
Longitudinal Orientation ◽  
Bcc Metal

ABSTRACTLow ductility of the reinforcing bcc metal phase at room temperature and weak interfaces can limit the intrinsic toughness and ductility of NiAl-bcc metal eutectic composites. The potential of rhenium (Re) addition, which is known to solid solution soften and lower the ductile-to-brittle transition temperature of various bcc metals, to enhance the ductility and toughness of a directionally solidified NiAl-9 at.% Mo eutectic alloy was investigated. Re partitioned to the bcc metal phase and formed a substitutional solid solution. The interface morphology was changed from a faceted to a non-faceted one. Re alloying caused softening of the Mo fibers, and as a result NiAl-Mo(Re) alloys were softer in compression and flexure and had ∼20% higher fracture toughness values as compared to the transverse orientation toughness of NiAl-9Mo alloy. The toughness of the NiAl-Mo(Re) alloys was lower man the longitudinal orientation toughness of the NiAl-9Mo alloy due to the poor alignment of the Mo(Re) phase with the growth direction. The toughening mechanisms have been evaluated and schemes for processing NiAl-Mo(Re) alloys for higher toughness in the longitudinal orientation are suggested. The role of the residual interstitial impurities and partitioning of Ni and Al to Mo fibers on the mechanical properties are highlighted.

Ethanol conversion over Ga2O3-ZrO2 solid solution: empirical evidences of the reaction pathway, the surface acid–base property, and role of isolated gallium ion

2021 ◽  
Author(s):  
Takashi Yamamoto ◽  
Akihito Kurimoto ◽  
Riona Sato ◽  
Shoki Katada ◽  
Hirotaka Mine ◽  
...  
Keyword(s):  
Solid Solution ◽  
Reaction Pathway ◽  
Ethanol Conversion ◽  
Acid Base ◽  
Base Property ◽  
Temperature Range ◽  
Acid Base Property

Ethanol conversion by Ga2O3-ZrO2 solid solution was examined in the temperature range 573–773 K, and acetone/isobutene formation was confirmed under cofeeding of H2O vapor. The reaction pathway was empirically investigated...

Multiplicative white-noise-induced phase transitions: the role of the stochastic interpretation

2004 ◽  
Author(s):  
Jose M. Sancho ◽  
Oliver Carrillo ◽  
Marta Ibanes ◽  
Jaume Casademunt ◽  
Jordi Garcia-Ojalvo
Keyword(s):  
Phase Transitions ◽  
White Noise ◽  
Multiplicative White Noise

scholarly journals The role of Ni-Mn hybridization on the martensitic phase transitions in Mn-rich Heusler alloys

2012 ◽  
Vol 100 (17) ◽  
pp. 172403 ◽  
Author(s):  
Mahmud Khan ◽  
J. Jung ◽  
S. S. Stoyko ◽  
Arthur Mar ◽  
Abdiel Quetz ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Heusler Alloys ◽  
Martensitic Phase ◽  
Martensitic Phase Transitions

A Simple Dissolved Metals Mixing Route to Prepare Nanostructured Mg0.8Zn0.2TiO3 Solid Solution

2015 ◽  
Vol 1112 ◽  
pp. 47-52 ◽  
Author(s):  
Frida Ulfah Ermawati ◽  
Suasmoro Suasmoro ◽  
Suminar Pratapa
Keyword(s):  
Solid Solution ◽  
Particle Size ◽  
Rietveld Analysis ◽  
Dissolved Metals ◽  
Intermediate Phases ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Zn Ions

A study of liquid mixing route to synthesize high purity Mg0.8Zn0.2TiO3 nanopowder, a candidate dielectric ceramics, has been successfully performed. Formation of the phases on the dried powder was studied using TG/DTA, XRD and FT-IR data. Rietveld analysis on the collected XRD patterns confirmed the formation of solid solution in the system. Such solid solution can be obtained from the powder calcined at 500 °C, but calcination at 550 °C gave rise to the most optimum molar purity up to 98.5% without intermediate phases. The role of Zn ions on the formation of solid solution was also discussed. Homogeneity of particle size distribution and nano-crystallinity of the system was verified from the particle size analyzer data, TEM image and the Rietveld analysis output.

The promoting role of Ga in ZnZrOx solid solution catalyst for CO2 hydrogenation to methanol

2021 ◽  
Author(s):  
Feng Sha ◽  
Chizhou Tang ◽  
Shan Tang ◽  
Qingnan Wang ◽  
Zhe Han ◽  
...  
Keyword(s):  
Solid Solution ◽  
Co2 Hydrogenation

Formation of Solid Solution and Metallic Nickel Phases During Suspension Plasma Spraying of Co Oxide and Ni Oxide

2021 ◽  
Author(s):  
Vahid Jalilvand ◽  
Ali Dolatabadi ◽  
Christian Moreau ◽  
Saeed Mohammadkhani ◽  
Lionel Roué ◽  
...  
Keyword(s):  
Solid Solution ◽  
Inert Anode ◽  
Metallic Nickel ◽  
Aluminum Production ◽  
X Ray Diffraction ◽  
Oxide Coatings ◽  
Cobalt Nickel ◽  
Sprayed Coatings ◽  
Insight Into

Abstract The focus of this study is the formation of a solid solution and metallic nickel in the cobalt-nickel mixed oxide coatings during suspension plasma spray (SPS) deposition. The (Co,Ni)O solid solution is a potential material for inert anode applications in aluminum production. SPS coatings and in-flight collected particles are studied to gain further insight into the melting and mixing phenomena of the NiO and CoO powders as well as phase formation in the deposited coatings. Moreover, the role of suspension feedstock particle sizes on the microstructure of coatings is discussed. SEM, EDS and X-ray diffraction studies helped better understanding the formation of different crystalline phases within the as-sprayed coatings. It was found that the formation of metallic nickel is possible in the coatings. The results support the importance of substrate temperature on the formation of metallic Ni, so that keeping the substrate at low temperature results in an increase of the Ni content in the coatings. In this study, possible causes for the formation of metallic Ni during spraying are discussed.

Response to ‘‘Role of nonperturbative field configurations in phase transitions.’’

1986 ◽  
Vol 34 (2) ◽  
pp. 662-663
Author(s):  
Hideaki Aoyama ◽  
Helen R. Quinn
Keyword(s):  
Phase Transitions
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