COMPARATIVE STUDY BY SOL-GEL ACRYLAMIDE POLYMERIZATION VIA MICROWAVE AND SOLID STATE SYNTHESIS METHODS IN (Er2-x Srx)Ru2O6 SYSTEM

MRS Advances ◽  
2017 ◽  
Vol 2 (62) ◽  
pp. 3883-3889
Author(s):  
A. Quiroz ◽  
M. Abatal ◽  
E. Chavira ◽  
A. Tejeda ◽  
O. Novel ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Morphological Properties ◽  
Synthesis Methods ◽  
X Ray Diffraction ◽  
Methods Of Synthesis ◽  
Acrylamide Polymerization ◽  
Image Position ◽  
Decomposition Phase

AbstractWe have studied the structural and morphological properties on the pyrochlore (Er2-x Srx)Ru2O6 system, for x = 0.0, 0.02, 0.05, 0.07, 0.10, and 0.15. Polycrystalline samples were prepared by solid-state reaction (SR) and sol-gel acrylamide polymerization (SGAP). Thermogravimetric Analysis (TGA) was used to follow the thermal transformations such as reagents decomposition, phase transformation, chemical stability, and volatilization of organic material of samples. The reagents and synthesized products by the different methods of synthesis were characterized using powder X-ray diffraction (XRD). All samples crystallize Er2Ru2O6 PDF (72-7620) in the cubic unit cell with Fd$\bar{3}$m (No. 227) space group and form a solid solution up to x = 0.15. Scanning electron microscopy (SEM) shows considerable variations and similitudes in sizes, very few phases and shapes of polycrystals can be observed. Polycrystalline samples prepared by solid-state reaction (SR) present a grain size varies between 77 nm to 250 nm.

scholarly journals Preparation of La0.7Ca0.3−xSrxMnO3 Manganites by Four Synthesis Methods and Their Influence on the Magnetic Properties and Relative Cooling Power

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 309 ◽  
Author(s):  
María Botello-Zubiate ◽  
María Grijalva-Castillo ◽  
Daniel Soto-Parra ◽  
Renee Sáenz-Hernández ◽  
Carlos Santillán-Rodríguez ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Pechini Method ◽  
Sol Gel ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Synthesis Methods ◽  
Consolidation Process

Manganites of the family La0.7Ca0.3−xSrxMnO3 were fabricated by four preparation methods: (a) the microwave-assisted sol-gel Pechini method; (b) sol-gel Pechini chemical synthesis; (c) solid-state reaction with a planetary mill; and (d) solid-state reaction with an attritor mill, in order to study the effect of the preparation route used on its magnetocaloric and magnetic properties. In addition, the manganites manufactured by the Pechini sol-gel method were compacted using Spark Plasma Sintering (SPS) to determine how the consolidation process influences its magnetocaloric properties. The Curie temperatures of manganites prepared by the different methods were determined in ~295 K, with the exception of those prepared by a solid-state reaction with an attritor mill which was 301 K, so there is no correlation between the particle size and the Curie temperature. All samples gave a positive slope in the Arrot plots, which implies that the samples underwent a second order Ferromagnetic (FM)–Paramagnetic (PM) phase transition. Pechini sol-gel manganite presents higher values of Relative Cooling Power (RCP) than the solid-state reaction manganite, because its entropy change curves are smaller, but wider, associated to the particle size obtained by the preparation method. The SPS technique proved to be easier and faster in producing consolidated solids for applications in active magnetic regenerative refrigeration compared with other compaction methods.

scholarly journals Microstructural Comparison of La-V-O Compounds Prepared by Sol-Gel Acrylamide Polymerization and Solid State Reaction.

2009 ◽  
Vol 15 (S2) ◽  
pp. 1044-1045 ◽  
Author(s):  
G Herrera ◽  
E Chavira ◽  
J Jiménez-Mier ◽  
A Ordoñez ◽  
E Bucio ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Acrylamide Polymerization

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

scholarly journals Pengaruh Temperatur Sintering Terhadap Struktur dan Sifat Magnetik Ni2+- Barium Ferit sebagai Penyerap Gelombang Mikro

2018 ◽  
Vol 1 (1) ◽  
pp. 23
Author(s):  
Muhammad Iqbal Ramadhan ◽  
Wahyu Widanarto ◽  
S Sunardi
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray

Barium ferit yang di doping Ni2+ konsentrasi  0,7 mol dengan variasi temperatur sintering 450ºC (hanya pre-sintering), 600ºC, 700 ºC, dan 800ºC telah dibuat menggunakan metode modified solid state reaction. Sampel dianalisis fasa kristal, ukuran kristal, sifat magnetik dan penyerapan gelombang mikronya. metode modified solid state reaction merupakan perpaduan antara metode sol-gel dan solid state reaction, yang meliputi pembuatan larutan prekusor awal, sol-gel, pemadatan, pre- sintering dan sintering. Sampel yang telah dibuat selanjutnya dikarakterisasi dengan alat X-Ray Diffraction (XRD),Vibrating Sample Magnetometer (VSM) dan Vector Network Analyzer (VNA). Hasil karakterisasi menunjukkan bahwa semua sampel yang telah disintesis mengandung dua fasa yaitu  BaFe2O4  dan NiFe2O4   Kurva histerisis menunjukkan bahwa semua sampel merupakan material superparamagnetik. Material penyerap gelombang mikro yang baik memiliki refleksi hilang yang tinggi dan bandwith yang lebar. Pada temperatur 700ºC menunjukkan hasil terbaik dengan rentang frekuensi penyerapan terbanyak pada frekuensi 8,14 GHz – 8,54 GHz; 9,88 GHz–10,88 GHz; 11,70 GHz – 12,00 GHz dan memiliki penyerapan yang paling tinggi dibandingkan dengan ketiga sampel lainya yakni pada frekuensi 8,30 GHz sebesar  -27,30 dB. Berdasarkan hasil yang diperoleh bahwa variasi temperatur sintering telah berpengaruh pada fasa kristal, ukuran kristal, sifat megnetik, dan penyerapan gelombang mikronya. Dengan demikian Ni- Barium Ferit sangat berpotensi sebagai material absorpsi gelombang mikro

Structural and morphology comparison between m-LaVO4 and LaVO3 compounds prepared by sol–gel acrylamide polymerization and solid state reaction

2009 ◽  
Vol 479 (1-2) ◽  
pp. 511-519 ◽  
Author(s):  
G. Herrera ◽  
E. Chavira ◽  
J. Jiménez-Mier ◽  
A. Ordoñez ◽  
E. Fregoso-Israel ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Acrylamide Polymerization

Synthesis of the RuSr2GdCu2O8±z Compound at Ambient Pressure Through a Solid State Reaction, Melts and Sol-Gel by Acrylamide Polymerization Methods

2009 ◽  
Vol 157 (1-2) ◽  
pp. 57-66 ◽  
Author(s):  
M. Abatal ◽  
E. Chavira ◽  
C. Filippini ◽  
V. García-Vázquez ◽  
J. C. Pérez ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Acrylamide Polymerization

Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells

2021 ◽  
pp. 122172
Author(s):  
Chrystian G.M. Lima ◽  
Allan J.M. Araújo ◽  
Rinaldo M. Silva ◽  
Rafael A. Raimundo ◽  
João P.F. Grilo ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Calcium Ferrite ◽  
Mollusk Shells

Effect of Sintering Temperature on Electrical Properties of SFN Ceramics Doped with Al Prepared by a Solid-State Reaction Technique

2016 ◽  
Vol 675-676 ◽  
pp. 527-530
Author(s):  
Thanatep Phatungthane ◽  
Kachaporn Sanjoom ◽  
Denis Russell Sweatman ◽  
Buagun Samran ◽  
Chamnan Randorn ◽  
...  
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Dielectric Behavior ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
Pure Perovskite Phase

In the present work, strontium iron niobate SrFe0.5Nb0.5O3 ceramics doped with aluminum were synthesized by a solid-state reaction technique. Phase formation investigation by X-ray diffraction technique (XRD) revealed that all ceramics exhibited pure perovskite phase with orthorhombic symmetry. Grain size observed by electron microscopy (SEM) was found to increase with increasing sintering temperature. The electrical properties and related parameters of the ceramics were also measured. The ceramics exhibit very good dielectric behavior and have a significant potential for dielectric applications.

Preparation of Ultra–Fine La3NbO7 Powder by Solid State Reaction

2012 ◽  
Vol 512-515 ◽  
pp. 158-161 ◽  
Author(s):  
Ling Dai ◽  
Qiang Xu ◽  
Shi Zhen Zhu ◽  
Ling Liu
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Single Phase ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
X Ray ◽  
Granular Particle ◽  
Fine Particle Size ◽  
Ultra Fine Particle ◽  
Different Temperatures

As a new candidate material for the ceramic layer in thermal barrier coatings (TBCs) system, La3NbO7 was synthesized with La2O3 powder and Nb2O5 powder by solid state reaction. The stating powders with a mole ratio of La to Nb of 3:1 were mixed and then the mixture was calcined under the different temperatures(800°C, 1000°C, 1200°C) and dwell times(2h, 6h, 10h). The phase structure of the powder was observed by X–ray diffraction(XRD), and the microstructure of the sample was observed by scanning electron microscope(SEM). The effect of calcination temperature and dwell Time on the phase formation were examined. The results indicate that the La3NbO7 powder with single phase can be synthesized successfully at 1200°C for 10h in air, and the La3NbOsub>7 powders synthesized have an ultra-fine particle size of 0.5˜1µm with a granular particle shape. With the temperature increasing, LaNbO4/sub> was synthesized firstly and then La3NbO7 was synthesized with a mole ratio of La2O3 to LaNbO4 of 1:1.

Preparation and Microwave-Absorption Property of SiO2-SiC-Based Composites

2010 ◽  
Vol 434-435 ◽  
pp. 231-234
Author(s):  
Li Guan ◽  
Bing Bing Fan ◽  
Ming Liang Li ◽  
He Jing Wen ◽  
Kai Li ◽  
...  
Keyword(s):  
Solid State ◽  
Microwave Absorption ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Composite Particles ◽  
Network Analyzer ◽  
Epoxide Resin ◽  
Maximum Reflectivity ◽  
Sol Gel Process ◽  
Sic Composites

SiO2-SiC composite particles were prepared using a sol-gel process. BaTiO3 powders were synthesize through solid-state reaction. They were mixed as microwave absorbents with Fe3O4 powders to obtain the complex absorption. Epoxide resin (EP) was used as matrix and solidified with the mixtures. The techniques of DSC-TG, XRD were used to characterize the composite particles and the obtained compacts. A vector network analyzer was used to measure the reflectivity of the SiO2-SiC-based composites. The effects of the aborbents’ contents on the reflection of the microwave absorption materials were disscussed. It was found that SiO2-SiC composites could be prepared using sol-gel process and BaTiO3 powders could be synthesize through solid-state reaction. The results indicated that SiO2-SiC composite is contribute to absorb microwave, where SiO2-SiC: BaTiO3: Fe3O4 = 6:2:2 (vol %), the frequency region in which the maximum reflectivity is more than -10 dB is 5.4-7.6 GHz.

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