Phase evolution in SrTiO3-PbZrO3 solid solution

2007 ◽  
Vol 101 (8) ◽  
pp. 084117 ◽  
Author(s):  
E. P. Smirnova ◽  
A. V. Sotnikov ◽  
O. E. Kvyatkovskii ◽  
M. Weihnacht ◽  
V. V. Lemanov
Keyword(s):  
Solid Solution ◽  
Phase Evolution

THERMODYNAMIC ANALYSIS OF PHASE FORMATION IN MECHANICAL ALLOYED Fe3Al POWDER

2011 ◽  
Vol 18 (03n04) ◽  
pp. 115-120
Author(s):  
L. X. PANG ◽  
X. H. HAO ◽  
N. F. HAN ◽  
J. XU ◽  
X. D. TANG ◽  
...  
Keyword(s):  
Solid Solution ◽  
Driving Force ◽  
Lattice Strain ◽  
Driving Forces ◽  
Phase Evolution ◽  
Mechanically Alloyed ◽  
Energy Of Mixing ◽  
Supersaturated Solid Solutions ◽  
Free Energy Of Mixing ◽  
Aluminum Phase

Nanocrystalline supersaturated solid solutions were formed by mechanically alloyed Fe-28Al (in atom percent) from the elemental powder of iron and aluminum. Phase evolution, grain size and lattice strain of these powders were determined and discussed. A thermodynamic model was developed based on semi-experimental theory of Miedema to calculate the chemical driving force for phase evolution. The influence of thermodynamic driving forces, namely the Gibbs free energy of mixing, for the solid solution and the amorphous was discussed and corresponded to the sequence of phase formations during mechanical alloying.

scholarly journals Microstructural Evolution, Thermodynamics and Kinetics of Mo-Tm2O3 Powder Mixtures during Ball Milling

2016 ◽  
Author(s):  
Yong Luo ◽  
Guang Ran ◽  
Nanjun Chen ◽  
Qiang Shen ◽  
Yaoli Zhang
Keyword(s):  
Solid Solution ◽  
Ball Milling ◽  
Microstructural Evolution ◽  
Driving Force ◽  
Phase Evolution ◽  
Heat Of Mixing ◽  
Powder Mixtures ◽  
Thermodynamics And Kinetics ◽  
Transmission Electron ◽  
Kinetics Of

The microstructural evolution, thermodynamics and kinetics of Mo-21%Tm2O3 (mass fraction, %) powder mixtures during ball milling were investigated using X-ray diffraction and transmission electron microscopy. Ball milling induced Tm2O3 to be decomposed and then dissolved into Mo crystal. The supersaturated nanocrystalline solid solution of Mo (Tm, O) was obtained after 96 h of ball milling. The elements of Mo, Tm and O were distributed uniformly in the ball-milled particles. Based on the semi-experimental theory of Miedema, a thermodynamic model was developed to calculate the driving force of phase evolution. There was no chemical driving force to form a crystal solid solution of Tm atoms in Mo crystal or an amorphous phase because the Gibbs free energy for both processes was higher than zero. For Mo-21%Tm2O3, it was mechanical work, not negative heat of mixing, that provided the driving force to form supersaturated nanocrystalline Mo (Tm, O) solid solution.

Synthesis of Aluminum Titanate Solid Solution by Solid State Reaction of Fine Commercial Al2O3, TiO2 and MgO Powders

2007 ◽  
Vol 336-338 ◽  
pp. 1327-1330 ◽  
Author(s):  
Gang Xu ◽  
Con Jiang Tu ◽  
Wen Jian Weng ◽  
Pi Yi Du ◽  
Ge Shen ◽  
...  
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Solid State Reaction ◽  
Raw Materials ◽  
Phase Evolution ◽  
Solid State Reaction Method ◽  
Synthesis Temperature ◽  
Aluminum Titanate ◽  
Reaction Method ◽  
Α Al2o3

The synthesis of aluminum titanate solid solution (Al2(1-x)MgxTi1+xO5, x=0, 0.1, 0.2) powders was realized by solid state reaction method using fine commercial α-Al2O3, TiO2 and MgO powders as raw materials. The effect of the introduced amount of MgO on the phase formation of aluminum titanate solid solution was investigated by XRD following the phase evolution. It was revealed that the introduction of MgO strongly affects the formation of Al2(1-x)MgxTi(1+x)O5 solid solution. The easily formed MgTi2O5 acts as the nucleus prompting the formation and lowering the synthesis temperature. The microstructure and properties of the solid solution ceramics were also studied by SEM and measuring the fracture strength and the thermal expansion coefficient.

scholarly journals Microstructural and Magnetic Behavior of Nanocrystalline Fe-12Ni-16B-2Si Alloy Synthesis and Characterization

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1679
Author(s):  
Kaouther Zaara ◽  
Mohamed Khitouni ◽  
Lluisa Escoda ◽  
Joan Saurina ◽  
Joan-Josep Suñol ◽  
...  
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Milling Time ◽  
Milled Powder ◽  
Magnetic Behavior ◽  
Phase Evolution ◽  
High Energy ◽  
Refined Microstructure ◽  
Hard Magnetic Properties

The nanocrystalline Fe70Ni12B16Si2 (at.%) alloy was prepared by mechanical alloying (MA) of elemental powders in a high-energy planetary ball mill. Phase evolution, microstructure, thermal behavior and magnetic properties were investigated. It was found that a body-centered cubic structured solid solution started to form after 25 h milling and a faced-centered cubic structure solid solution started to form after 50 h of milling; its amount increased gradually with increasing milling time. The BCC and the FCC phases coexisted after 150 h of milling, with a refined microstructure of 13 nm and a 10 nm crystallite size. The as-milled powder was annealed at 450 °C and 650 °C and then investigated by vibrating sample magnetometry (VSM). It was shown that the semi-hard magnetic properties are affected by the phase transformation on annealing. The saturation magnetization decreases after annealing at 450 °C, whereas annealing at 650 °C improves the magnetic properties of 150 h milled powders through the reduction of coercivity from 109 Oe to 70 Oe and the increase in saturation magnetization.

Phase transformation in equimolecular mixture of HfC-ZrC-TiC-NbC carbides

2021 ◽  
pp. 18-23
Author(s):  
D. Wang ◽  
◽  
Yu.A. Mirovoy ◽  
A.G. Burlachenko ◽  
A.S. Buyakov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Phase Transformation ◽  
Solid Solutions ◽  
Powder Mixture ◽  
Phase Evolution ◽  
Host Material ◽  
Temperature Range

The phase evolution during sintering under pressure in the temperature range from 1400 to 1900 oC of equimolar powder mixture NbC-HfC-TiC-ZrC was investigated. It is established that monophase solid solution of (Hf, Zr, Ti, Nb)C substitution was formed at 1700 oC. From these experiments it was determined that HfC tends to act as the host material. It is shown that formation of (Hf, Zr, Ti, Nb)C solid solution proceeded multistage with formation of intermediate two- and three-component ceramic (Hf, Zr)C, (Nb, Zr)C, (Hf, Zr, Ti)C solid solutions and their subsequent dissolution. The (Hf, Zr, Ti, Nb)C solid solutions has improved mechanical properties as compared to similar properties of the original carbides: E = (616±77) GPa, H = (36±8) GPa, K1C = (3.4±0.5) MPa∙m1/2.

(K0.5Na0.5)NbO3–Bi(Mg0.5Ti0.5)O3 solid solution: phase evolution, microstructure and electrical properties

2013 ◽  
Vol 24 (11) ◽  
pp. 4346-4350 ◽  
Author(s):  
Fen He ◽  
Xiuli Chen ◽  
Jie Chen ◽  
Yiliang Wang ◽  
Huanfu Zhou ◽  
...  
Keyword(s):  
Solid Solution ◽  
Electrical Properties ◽  
Phase Evolution ◽  
Solution Phase ◽  
Solid Solution Phase

Phase Selection During Interdiffusion in Ti-Fe Multilayered Films

1993 ◽  
Vol 311 ◽  
Author(s):  
Z.Z. Yan ◽  
M.M. Trudeau ◽  
R. Schulz ◽  
R. Bormann ◽  
A.Van Neste ◽  
...  
Keyword(s):  
Solid Solution ◽  
Amorphous Phase ◽  
Phase Evolution ◽  
Calphad Method ◽  
Interfacial Structure ◽  
X Ray Diffraction ◽  
Multilayered Films ◽  
Phase Selection ◽  
Kinetics And Thermodynamics ◽  
X Ray

ABSTRACTThe formation of the metastable bcc solid solution and the amorphous phase during interfacial reaction of elemental multilayers has been studied using X-ray diffraction. Different kinds of interfaces have been synthesized in order to investigate the influence of the interfacial structure on phase evolution during annealing. The amorphization is found to be dependent on the structure of the interface and the results are discussed in terms of the kinetics and thermodynamics of the Ti-Fe system which has been calculated by the CALPHAD method.

Phase evolution and kinetics of the oxidation of monosulfide solid solution under isothermal conditions

2005 ◽  
Vol 427 (1-2) ◽  
pp. 13-25 ◽  
Author(s):  
Haipeng Wang ◽  
Allan Pring ◽  
Yaning Xie ◽  
Yung Ngothai ◽  
Brian O’neill
Keyword(s):  
Solid Solution ◽  
Phase Evolution ◽  
Monosulfide Solid Solution ◽  
Isothermal Conditions ◽  
Kinetics Of
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