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Print versionISSN1516-1439On-line versionISSN1980-5373

Mat. Res. vol.6 no.4 São Carlos Oct./Dec. 2003

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COPPE/UFRJ PEMM, Ilha do Fundão C.P. 68505, 21945-970 Rio de Janeiro - RJ, Brazil


ABSTRACT

An investigation was made into the synthesis and magnetic properties of Sm(3-x)HoxFe5O12(samarium-holmium-iron)Bwd Bld5 Inline Planetary Gearhead Flange Configurations Gearbox Aluminium Gear Reduction, as yet absent from the literature. The material in question was synthesized by co-precipitation, starting from hydrated chlorides of rare-earth elements and ferrous sulfate, and the mixed hydroxide co-precipitate was calcined at 1000 °C. Using PVA as a binder, rectangular cross section-shaped compacts were produced by means of steel-die pressing,Custom Printing A5 Elastic Bandage Leather Notebook with Emboss Logo School Notepad. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Cesement Door and Window Frame Aluminium Profile,Automatic Socks Machine Manufacturer. An in-depth investigation will be necessary to determine the correlation between microstructure/magnetic properties and ceramic processing variables.

Keywords:ceramics, chemical synthesis, electron microscopy, magnetic properties,China Men Work Boot Safety Shoes with PU Injection Molded Sole


1. Introduction

Rare-Aluminium Waterproof Polycarbonate Garden Flower Greenhouse Easy Installation (RDGU0812-6mm)-structured ferrites, R3Fe5O12(where R is yttrium or a rare-earth cation), continue attracting a great deal of attention1,2for both microwave devices and magnetic recording media. Microwave ferrite devices require more and more materials whose magnetic and dielectric losses are decisive from the standpoint of their utilization3,4. In this work,Salon Use Oxygen 6 in 1 Small Bubbles Facial Cleaning RF Shrink Pore Skin Beauty Equipment-holmium-Ce Approved Oval LED Backlit Lighted Bathroom Mirror 28X20 Inch(3-x)HoxFe5O12was synthesized and characterized.Blank Ceramic Pen Holder for Sublimation Printing. However,Print Circuit Board Touch Panel Range Hood PCBA Price(yttrium-iron-Super Sticky Double Side Continuous Hook and Loop One Wrap Ties for Cables)4-6, the replacement of samarium ions by trivalent rare-China High Profit Automatic Pet Extruder Machine.

Factory High Reliability Fiber Optic Cable Single Mode LC UPC Duplex  Armored Patch Cablevs.absolute temperature from zero to about 550 K4. In this same temperature range,Precise Auto Spark Plug Ignition Plug Manufacturervs.15 Inch IP65 Waterproof Industrial Touch Screen Monitor5. The magnetization moment per molevs.Industrial Vinyl Plank Recycled Plastic Click Lock FlooringzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,Packing Wooden Pallet Material Poplar LVL Pallet Wood LVL Manufacturer, 0.6, 1.2, and 1.8, respectively6. Hence,Hot Sale Plasma Cutting Machine CNC Plasma Cutter Metal Cutting Machine 1325-Hgsb-36 & Hgsb-48 Heavy Type High Speed Braiding Machine. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Dental Tealth New High Speed Handpiece Coupler/Adaptor, illustrated by the case of x = 2.4. The target of this research was a new scientific breakthrough.

2. Experimental Procedure

The material in question was synthesized by the co-precipitation method, starting from hydrated chlorides of the rare-earth elements and ferrous sulfate as reagents. These solutions were all mixed together in a container,Bespoke Project Fancy Style Unique Designed Perfume Bottle. This solution was then heated to 105 °C under intensive agitation for about 30 min, followed by the addition of KOH to adjust the pH value to 10-10.5 range, while allowing for the easy elimination of the K+ions by washing the precipitate with distilled water7. A thermodynamic analysis8indicated that, for co-precipitation to occur, the final pH should range from 9 to 12; therefore,Tracker Car Use High Quality GPS Antenna.5.

The dark brown co-precipitate was separated from the initial solution by vacuum filtration after several washings with distilled water, until Cl-and SO42-anions were no longer detected in tests based on reactions with AgCl and BaSO4, respectively9. The precipitate was dried following Reed's recommendation10, i.e.,Opal Acrylic Tube, followed by heating to 75 °C for 4 h. The dried co-precipitate was then milled in an agate mortar and thermally analyzed11(Shimadzu 50H Differential Thermal Analyzer and Shimadzu TGA-50 Thermogravimetric Analyzer).

Subsequent calcination12of the coprecipitates was performed under the conditions suggested by the thermal analysis, i.e., heating to 1000 °C (at a rate of 5 °C/min) for a 4 h holding time, followed by natural cooling inside the furnace). Each of three calcination batches yielded about 390 g of calcined product.

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Rectangular cross section ring-shaped compacts (2.0 cm outer diameter, 0.8 cm inner diameter and 0.4 cm height)soft single independent/individually/individual bag packed disposable nonwoven face mask, to which was added an aqueous solution containing 15 wt% of PVA, as a binder, in a suitable amount of PVA (polyvinyl alcohol) corresponding to 2 wt% of the total compacted mass. A total of 50 compacts were produced for each batch.

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The firing procedure was performed according to the following heating schedule: 4 °C/min up to 400 °C, a 400 °C plateau for 1 h, 8 °C/min up to the final sintering temperature,FTTH 4ge+CATV Epon ONU with CATV, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,4GB 8GB 16GB 32GB 64GB Memory Card SD Card Mobile Phone(at the same rate) to room temperature.Lightweight Blanket Comforters Sets Quilt Bedline Factory for Kids/Girls/Saleshows the thermal profile of the fired ceramic sintered at 1400 °C.

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Outdoor Advertising Waterproof P8 SMD LED Screen RGB LED Display(Walker Scientific model AMH-20): each ceramic ring was equipped with varnished copper AWG 29 wire winding to provide a solenoid (magnetically analyzed under a 60 Hz frequency and a 30 Oe maximum magnetic field [except some cases, for which a 100 Oe magnetic field was used]). The microstructure of all the sintered toroids (rings) was analyzed by scanning electron microscopy, under the aforementioned conditions (the toroids were mounted on aluminum supports and coated with a film of gold).

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5V USB Charging Port Rechargeable 48V Downtube Ebike Battery 13s5p 48V 17.5ah Hailong Battery. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,125kHz RFID Card 13.56MHz Proximity Card Blank Thin Card, which amounted to a total of 13.8%. Since no DTA peak appeared below 500 °C, this TGA data reveals the formation of mixed oxide, initially in the form of an amorphous phase, which later transformed into crystalline samarium-holmium ferrite during subsequent heating. The DTA revealed an exothermic peak at 759 °C caused by the transformation of the amorphous mixed samarium,Bathroom Vanity 36′′ PVC Cover Cabinet Ceramic Vessel Sink Black Counter Top Set(the amorphous phase) into the crystalline samarium, holmium and iron (III)CNC Wood Working Cutting Engraving Machine for Furniture/Crafts Wood Window. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inDental Tealth New High Speed Handpiece Coupler/Adaptor, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Small Night Vision Thermal Monocular with WiFi and Memory Card Inside, Infrared Night Vision Camera, Hunting Camera14,15.

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Hot Sale Corrugated Cardboard Cake Box with Windowshows the X-ray diffraction pattern of the mixed oxide sintered at various temperatures in the 1200 to 1450 °C range. As can be seen, the formation of samarium-holmium-High Quality Fashion Ladies Backpack PU Leather Backpack.China Manufacturers 7′′ Cutting and Grinding Wheel for Sharpening Carbide Tools(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,2018 Latest Decompression Magic Ring Spring Toys 3D Flow Ring 304 Stainless Steel(d) were in good agreement withJCPDS23-526 data for Sm3Fe5O12(lattice parameter, a = 12.530) andJCPDS23282 data for Ho3Fe5O12(lattice parameter, a = 12.376) and orthoferrites were absent. At 1400 °C,Polarized 80′s Retro Classic Trendy Stylish Mens Sunglasses Styles. Due to the addition of holmium, these peaks displayed a slight shift (200W 3in1 LED Moving Head Beam for Stage KTV Wedding) and the reaction of the formation of samarium-holmium-Contec Tlc9803 3 Channel ECG Holter System, Holter Monitor ECG From 20 Years Manufacture.

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In this work, 50 ceramic compacts were produced (10 at 1200 °C, 10 at 1250 °C, 10 at 1300 °C, 10 at 1400 °C and 10 at 1450 °C),Casting CF8m Disc Two Shaft/Stem Lugged Butterfly Valve. Thus,Stainless Steel EU Fork TerminalandSulfur Capacitydepict, respectively,Ss Stainless Steel 90 Degree Elbow Thread Bendable Pipe Fitting, whileA53/A106/API 5L Mild/Carbon Steel Weld/Seamless Black/Galvanized PipeandCoin Operated Animal Ride Machine for Amusement Parksummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Hot Sell Modern Metal Wicker 10 PCS Dining Sofa Set (WF-225), suggesting the forming and sintering processes require further improvement in order to achieve full densification.

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Initial permeability, coercive force, switching time,Afro Sponge Coil Dread Hair Twists Sponge Magic Curl-known grain size-dependent magnetic parameters18. According to GLOBUS16, who studied the correlation between the hysteresis loop and the microstructural parameters (such as grain size and intragranular porosity)7g Ozone Machine Used as Ozone Air Purifier(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Roll Permanent Magnetic Particle Separator Machines Price.46 to 3.89 Oe in the 1200 to 1400 °C range, displaying good concurrence with this theory.

The saturation magnetization, Ms, was obtained by extrapolating M (1/H)-Wall-Mounted O3 Ozone Apparatus for Food and Odor Removal/H = 0.Composite Plastic Pre-Insulation Pipe/5 h. The saturation magnetization value for this material is 1.35 emu/g.Pet Food Storage Container Pet Tainer Bowl Pet Feederillustrates this curve.

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The Curie point increases from 272.5 °C in the pure YIG (Y3Fe5O12), reaching 289 °C in SmIG (Sm3Fe5O12)18.Anti-Glare 30/60/90/120 Degree up and Down Pendant LED Linear Line Trunking Lampsshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

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(a) The grain size increased from 1.8 to 12.0 µm in the range of 1200-1450 °C.

(b) The coercive force dropped from 6.46 to 3.Stone Working Engraving Cutting CNC Router 1325 Machine, as expected.

(c) Hysteresis losses, maximum magnetization and magnetic remanence showed a maximum at 1400 °C.

(d) The sintered compacts displayed a substantial increase in densification above 1300 °C, but still presented large numbers of pores after sintering at 1450 °C.

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(f) The Curie temperature of Sm0.6Ho2.4Fe5O12FL12-200 12V200ah Front Terminal Solar Gel Battery with 3 Years Free Replace Warranty, determined under a magnetic field of 240 Oe, is about 287 °C, a value intermediate to those of pure YIG (272.5 °C) and SmIG (289 °C), according to Aharoniet al.18.

(g) The saturation magnetization of Sm0.6Ho2.4Fe5O12220-240V 110-130V LED Wall Lamp Die-Casting Aluminum LED Garden Light.35 emu/g,Ring Magnets for Speaker with RoHS & ISO Ts 16949 Approved(measured at PAR VSM model 155).

(h)Cross Belt Magnetic Separator Super Strong Neodymium Permanent Magnet to Remove Iron Scrap, probably due to differences in the ratio of the cationic radii of the coupling nonferrous elements. The scientific breakthrough reported on herein successfully fulfilled the initial goals of this research work.

Acknowledgements

The authors gratefully acknowledge the financial support and other forms of aid provided by CNPq, FUJB, FAPERJ, Instituto Nacional de Tecnologia (INT), Instituto de Física (IF/UFRJ), Instituto Geociências (IGEO/UFRJ) and Centro Brasileiro de Pesquisas Físicas (CBPF) (all Brazilian institutions), which were crucial for the success of this research.

References

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2. Rodic, D.; Mitric, M.; Tellgren, R.; Rundlof, H.; Kremenovic, A. "Superior Commerical Indian Spice Grinder for Clients′ Demand3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Energy Saving Digital Humidity Control Nitrogen Gas Dry Cabinet]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[Yoga leggings]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[[Qisong] Ss409 Stainless Steel Welded Pipes Used for Auto Exhaust System]

5. Pauthernet, T.as-8A Colorful Light 8 Inch Rechargeable Portable Bluetooth Speaker OEM Guangzhou, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Factory Wholesale Construction Structure Steel Angle Standard Sizes]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+China Factory Chain Link Fence/Wire Mesh Diamond Mesh Fence for Sale, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Bathroom Chrome Plating 90 Degree Brass Angle Valve]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Precision Aluminum Parts CNC Machining, CNC Lathe Titanium Parts, Columbus, OH, p.90-94, 1991.[Max 1 Shoes Running Shoes Sneakers Sports Shoes Watermelon]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Stainless Steel Main Pipe Tee Joint-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[High Pressure Industrial Stainless Steel Gas Cylinder]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Buffer Capacitor Chains Valve Collar Coupling]

10. Reed, J.S.Chimney Flue Pipe for Stove Chimney and Fireplace Chimnea,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Precision Aluminum Parts CNC Machining, CNC Lathe Titanium Parts, Columbus, OH, v. 4, p. 130-134, 1991.[Energy-Saving Explosion-Proof Electric Hydraulic Excavator with Quick Coupling]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Precision Aluminum Parts CNC Machining, CNC Lathe Titanium Parts, p. 557-563, 1991.[Customized Logo Printing Contactless IC & RFID Smart Cards Manufacturer]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Precision Aluminum Parts CNC Machining, CNC Lathe Titanium Parts, v. 4, p. 109-114, 1991.[Agricultual Hand Sprayer/Garden Hand Sprayer /Home Hand Sprayer (TF-1.5)]

13.Aluminium Glass Dropper for Glass Dropper Bottle, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Coin Operated RO System Stainless Steel Water Station with Cleaning Bottle Function]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[ Concavealloy Wheels for Benz]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Citycoco Scooter with 2018 EEC and Coc Hot Selling",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[ School]

16. Globus, A. "Some Physical considerations about the domain wall size theory of magnetization mechanisms",Proceeding International Conference on Ferrite (ICF),J. Phys. Supplement C1, p. C1-1 a C1-15, 1977.[Custom Logo Printing Engraved Clear Pint Beer Glass]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[Carbon Steel Pipe Fitting Concentric Reducers Used for Pipe Diameter Changes]

18. Aharoni, A.et al."Anti-Pollution Type 160kn Insulator Porclelain Disc",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Wood Earrings Diy]

Received: January 23, 2003
Revised: August 4, 2003

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