Study on the Phase Formation of Corundum-Type Mg4Nb2O9 Powders by the Solid-State Process

2012 ◽  
Vol 499 ◽  
pp. 174-177
Author(s):  
Yi Shan Jiang ◽  
Ying Zi Wang ◽  
Ya Ming Chen ◽  
Yun Long Yue ◽  
Hai Tao Wu
Keyword(s):  
Phase Composition ◽  
Solid State ◽  
Phase Formation ◽  
Single Phase ◽  
Magnesium Niobate ◽  
Calcination Temperatures ◽  
Air Atmosphere ◽  
State Process

The corundum-type magnesium niobate, Mg4Nb2O9, powders were synthesized by the conventional solid-state process. The mixtures of MgO and Nb2O5were calcined in the temperature ranging from 500°C to 1200°C for crystallization in air atmosphere. The formation of the Mg4Nb2O9phase was investigated as a function of calcination temperatures by DTA and XRD. The morphology and phase composition were determined via a combination of SEM and EDX techniques. The results showed that the single-phase Mg4Nb2O9could be obtained at 1050°C for 2h with the size of less than 5μm.

Characterization of NiTi Shape Memory Alloy Sintered at Different Temperatures in Reducing Environment

2020 ◽  
Vol 1010 ◽  
pp. 632-637
Author(s):  
Hafizah Hanim Mohd Zaki ◽  
Nur Azemuzahir Mohd Sobri ◽  
Jamaluddin Abdullah ◽  
Norshahida Sariffudin ◽  
Farah Diana Mohd Daud
Keyword(s):  
Solid State ◽  
Shape Memory ◽  
Phase Formation ◽  
Single Phase ◽  
Reducing Agent ◽  
Niti Shape Memory Alloy ◽  
Transformation Behavior ◽  
Formidable Challenge ◽  
Different Temperatures ◽  
Reducing Environment

NiTi has received significant interest as medical implant materials due to its shape memory effect behavior apart from its good biocompatibility and mechanical properties. The formidable challenge of obtaining single phase NiTi from elemental powders via solid state is due to oxidation problem of elemental powders and the oxygen atoms dissolve in NiTi matrix as interstitial impurities forming stable oxygen-rich TiNiOx. This may deterioriate the shape memory behavior of NiTi. This research investigates the use of MgH2 in combination with CaH2 as in-situ reducing agent to eliminate oxidation of the specimen during sintering both at lower and higher sintering temperatures. Here, the effect of sintering temperature on phase formation and transformation behavior of NiTi in reducing environment was studied. The phase formation was characterized by using x-ray diffraction (XRD) where the morphology and elemental analysis were characterized by using the scanning electron microscope (SEM) equipped with EDS. The martensitic transformation behavior was analyzed using differential scanning calorimeter (DSC). The use of MgH2 and CaH2 as reducing agent has a significant influence on the phase formation of NiTi synthesized via solid state especially at 930 °C, where almost single phase NiTi was formed with good transformation behavior. This reducing agent creates a conducive environment for the production of single phase NiTi.

Preparation of Aluminum Oxynitride Powder by Solid State Reaction Method

2008 ◽  
Vol 368-372 ◽  
pp. 435-437 ◽  
Author(s):  
Jin Song Wen ◽  
Tie Cheng Lu ◽  
Jian Qi Qi ◽  
Ji Cheng Zhou ◽  
Wei Pang ◽  
...  
Keyword(s):  
Phase Composition ◽  
Solid State ◽  
Single Phase ◽  
Raw Materials ◽  
Solid State Reaction Method ◽  
Aluminum Oxynitride ◽  
Reaction Method ◽  
Weight Percentage ◽  
Α Al2o3 ◽  
Holding Temperature

Single-phase aluminum oxynitride powders were obtained by varying the holding temperature (T) and the weight percentage of α-Al2O3 in Al2O3 (X) with nano-sized Al2O3 and AlN powders as raw materials. Influences of T and X on the phase composition of obtained powders were studied. The results showed that the content of aluminum oxynitride increased with increasing T or X. When X was 50% and T was 1750°C, obtained powders had better properties than those of others.

scholarly journals Pembuatan Katoda Baterai Lithium Ion Iron Phospate (LiFePO4) dengan Metode Solid State Reaction

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Elizabeth Putri Permatasari ◽  
Mega Permata Rindi ◽  
Agus Purwanto
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Single Phase ◽  
Lithium Iron Phosphate ◽  
Process Condition ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Calcination Temperatures

<p>One of the most finest materials for lithium ion battery nowadays is lithium iron phosphate or LiFePO4. Lithium iron phosphate was synthesized with solid state reaction method  by  optimizing  the  variable  of  material  and  temperature.  The  variable  for calcination temperatures were 700oC, 800oC, and 900oC while the basic materials as Fe sources were Fe2O3 and FeSO4. Particles morphologies and quantity of crystal were investigated in details by X-ray diffraction analysis XRD. XRD imaging showed diffraction of nanoparticles LiFePO4 with crystal quantity 40,4% (800oC) and 59,1% (900oC) of materials Fe2O3,which the most quantity from other samples. Thus, chatode materials were made from LiFePO4 that synthesized at calcination temperatures 800oC and 900oC. In conclusion the material chatode from LiFePO4 that had been synthesized had so many impurities because it was hard to get single phase of nanoparticles LiFePO4 and need more improvement in optimizing the process condition for ideal chatode material.</p>

scholarly journals Phase formation processes and synthesis of solid solutions in Ca-R-Nb-M-O systems

2020 ◽  
Vol 7 (1) ◽  
pp. 17-25
Author(s):  
A. A. Levina ◽  
N. O. Tadevosyan ◽  
S. A. Petrova ◽  
E. S. Buyanova ◽  
M. V. Morozova
Keyword(s):  
Electrical Conductivity ◽  
Phase Composition ◽  
Composite Materials ◽  
Impedance Spectroscopy ◽  
Phase Formation ◽  
Solid Solutions ◽  
Single Phase ◽  
Xrd Analysis ◽  
Formation Processes ◽  
Phase Formation Process

During the study of the phase formation process in Ca-R-Nb-M-O systems (R=La, Bi, M=Mo, W), an attempt was made to obtain single-phase compounds of CaRNbMO8 composition by the standard ceramic technique. In addition, samples based on LaNbO4, CaWO4, BiNbO4 were also synthesized by the standard ceramic technique. The phase composition of the samples was studied by XRD analysis. The electrical conductivity of the obtained solid solutions and potential composite materials was investigated by impedance spectroscopy.

Effect of Calcination Conditions on Phase Formation and Characterization of BiFeO3 Powders Synthesized by a Solid-State Reaction

2008 ◽  
Vol 55-57 ◽  
pp. 237-240 ◽  
Author(s):  
C. Silawongsawat ◽  
S. Chandarak ◽  
Thanapong Sareein ◽  
Athipong Ngamjarurojana ◽  
S. Maensiri ◽  
...  
Keyword(s):  
Solid State ◽  
Phase Formation ◽  
Solid State Reaction ◽  
Single Phase ◽  
Bismuth Ferrite ◽  
Vibrating Sample Magnetometer ◽  
Time Saving ◽  
First Time ◽  
Perovskite Type

A perovskite-type phase of Bismuth Ferrite, BiFeO3, powder was synthesized by a solid-state reaction via a rapid vibro-milling technique. The effect of calcination condition on the phase formation, and characterization of BiFeO3 powder was investigated. The formation of the BiFeO3 phase investigated as a function of calcination conditions by TG–DTA and XRD. Morphology, particle size and chemical composition have been determined via a combination of SEM and EDX techniques and vibrating sample magnetometer (VSM) were used to characterize the structures and magnetic properties of prepared samples. The rapid vibro-milling is employed for the first time in this work as a significant time-saving method to obtain single-phase BiFeO3 powders.

Dielectric Properties of Li-Zr Modified NiO at High Frequency

2016 ◽  
Vol 846 ◽  
pp. 326-330
Author(s):  
C.T. Ping ◽  
Syarifah Aishah Syed Salim ◽  
Julie Juliewatty Mohamed ◽  
Zainal Arifin Ahmad
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Phase Formation ◽  
Solid State Reaction ◽  
High Frequency ◽  
Single Phase ◽  
Impedance Analyzer ◽  
Single Phase Formation

Li+ and Zr2+ codoped NiO ceramics was successfully prepared from the mixture of commercial Li2CO3, ZrO2 and NiO using solid state reaction. The mixture of varies Li+ concentration (x = 0.01, 0.02, 0.03, 0.05 and 0.1), Zr2+ (y = 0.02) and NiO were ball milled for 24 hours. The samples were calcined at 1000oC for 2 hours, pressed into pellet shape at 250 MPa and sintered at 1280°C for 10 hours. The sintered pellets were subjected to XRD, SEM, density testing and Impedance analyzer. XRD result shows the single phase formation of LixNi1-x-0.02Zr0.02O. The grain becomes larger with the increament of Li+ mole %. The dielectric constant of LixNi1-x-0.02Zr0.02 decrease with the increasing frequency. The NiO codoped with Li+ and Zr2+ can be use excellently at high frequencies.Keywords: NiO doped Li+ and Zr2+, dielectric constant, high frequency

Effect of Calcination Conditions on Phase Formation and Characterization of BiFeO3-BaTiO3 Powders Synthesized by a Solid-State Reaction

2008 ◽  
Vol 55-57 ◽  
pp. 241-244 ◽  
Author(s):  
S. Chandarak ◽  
Thanapong Sareein ◽  
Athipong Ngamjarurojana ◽  
S. Maensiri ◽  
Pitak Laoratanakul ◽  
...  
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Phase Formation ◽  
Solid State Reaction ◽  
Single Phase ◽  
Vibrating Sample Magnetometer ◽  
Time Saving ◽  
First Time ◽  
Perovskite Type

A perovskite-type phase of solid solution of BiFeO3-BaTiO3 powders were synthesized by a solid-state reaction via a rapid vibro-milling technique. The effect of calcination condition on the phase formation, and characterization of BiFeO3-BaTiO3 powders were investigated. The formation of the BiFeO3-BaTiO3 phase investigated as a function of calcination conditions by TG–DTA and XRD. Morphology, particle size and chemical composition have been determined via a combination of SEM and EDX techniques and vibrating sample magnetometer (VSM) was used to characterize the structures and magnetic properties of prepared samples. The rapid vibro-milling is employed for the first time in this work as a significant time-saving method to obtain single-phase BiFeO3-BaTiO3 powders.

Peculiarities of Intermetallic Phase Formation in the Process of a Solid State Reaction in (Al/Cu)n Multilayer Thin Films

JOM ◽  
2021 ◽  
Author(s):  
Evgeny T. Moiseenko ◽  
Sergey M. Zharkov ◽  
Roman R. Altunin ◽  
Oleg V. Belousov ◽  
Leonid A. Solovyov ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Phase Formation ◽  
Solid State Reaction ◽  
Intermetallic Phase ◽  
Multilayer Thin Films

A review on phase prediction in high entropy alloys

2021 ◽  
pp. 095440622110089
Author(s):  
Vinay Kumar Soni ◽  
S Sanyal ◽  
K Raja Rao ◽  
Sudip K Sinha
Keyword(s):  
Solid Solution ◽  
Phase Formation ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Modeling Tools ◽  
High Entropy ◽  
Recent Developments ◽  
Phase Prediction ◽  
The Stability

The formation of single phase solid solution in High Entropy Alloys (HEAs) is essential for the properties of the alloys therefore, numerous approach were proposed by many researchers to predict the stability of single phase solid solution in High Entropy Alloy. The present review examines some of the recent developments while using computational intelligence techniques such as parametric approach, CALPHAD, Machine Learning etc. for prediction of various phase formation in multicomponent high entropy alloys. A detail study of this data-driven approaches pertaining to the understanding of structural and phase formation behaviour of a new class of compositionally complex alloys is done in the present investigation. The advantages and drawbacks of the various computational are also discussed. Finally, this review aims at understanding several computational modeling tools complying the thermodynamic criteria for phase formation of novel HEAs which could possibly deliver superior mechanical properties keeping an aim at advanced engineering applications.

Sign in / Sign up

Export Citation Format

Share Document