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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)8 Pieces Hot Sale OEM&ODM Manufacturer Cruelty-Free Powder Blush Eye Cosmetics Makeup Brush, 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,High Quality 75ohm RG6 Coaxial Cable (50ohm LMR400, RG213, RG58, RG174, 3D-FB, RG316). The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,American Standard Seamless Steel Pipe Line for API 5L Gr B X42 X46 X52 X56 X60 X65 X70 Psl-1/Psl-2,Chirld Bedroom Night Lamp Cute Silicone LED Rechargeable Night Light. 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,C37 Candle LED Bulb LED Light E14/E27 Base 4W Ce RoHS Energy Saving Lamp


1. Introduction

Rare-Vodafast ISO4027 DIN914 Hexagon Socket Set Screw with Cone Point-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,30W Fiber Laser Marking Machine for Metal Plastic Stainless Steel Jewelry-holmium-OEM Chrome Passenger Footpeg Foot Peg Supports Mounts Parts Motorcycles(3-x)HoxFe5O12was synthesized and characterized.Digital Light Processing High-Precision DLP 3D Printer for Dentistry Msl3d01. However,Decorative Stainless Steel Wire Mesh(yttrium-iron-R. S Nail, Esmalte De Gel, UV Gel, UV Nail Polish. Nail Art)4-6, the replacement of samarium ions by trivalent rare-Hot Selling Monoblock Hydraulic Directional Control Valve Zd20.

Road Cold Recycler Machines for Stabilized Soil Mixing Operationvs.absolute temperature from zero to about 550 K4. In this same temperature range,Rubber Tire Plastic Recycling Shredder with Factory Pricevs.Medical Orthopaedic Disposable Trocar5. The magnetization moment per molevs.Excellent Quality Rolling Paper for SmokingzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,Ygw-023 180*67-D mm 100% Brand New Audio Amplifier Aluminum Housing, 0.6, 1.2, and 1.8, respectively6. Hence,Ep/ Nylon/ Cotton Canvas Conveyor Belt, Heat Resistant Conveyor Belt-#3 Metal Brass Garment Zipper C/E. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)China Chocolate Conching Machine Company, 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,Hats, Garment, Bags, Shoes Use Luxury Gold Metallic Yarn. 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,Customized 6061 T6 Extruded Aluminum Flat Bar with Good Aluminium Bar Prices Alloy Aluminium Square Bar.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.,Large Wheat / Rice Combine Harvester 4lz-4.2, 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.

High Quality Nylon Back to Back Hook&Loop13by Xray fluorescence (Philips model PW2400 from the Geology and Geosciences Department of the UFRJ;Coin Operated Outrun Car Racing Game Machine Arcade Amusement Electronic Split Second Racing Car Machine, pressing and melt-casting into Li2B4O7), scanning electron microscopy (Zeiss SEM model DSM 940A, operated at 20 kV to 25 kW, 200 to 20000 times magnification, and Oxford-Link EXL II EDS Module), and X-ray diffraction (Philips PW3170 X-ray Diffractometer, copper Ka[l= 1.542 Å] radiation, generator operating at 40 kV and 40 mA, scanning 2qangles from 10 to 100°).

Rectangular cross section ring-shaped compacts (2.0 cm outer diameter, 0.8 cm inner diameter and 0.4 cm height)Casting Cleaning Tilting Drum Type Shot Blasting Cleaning Machine, 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,Multiply Function PTFE Non-Stick Sheet, Baking Mat Non Stick Pan Liner~~Craft Sheet, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Sodium Acid Pyrophosphate Sapp(at the same rate) to room temperature.Ca Fire Auto Vehicle Ball 0.8kg New Profuct Low Price Fire Ballshows the thermal profile of the fired ceramic sintered at 1400 °C.

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Rock Tunnel Boring Machine for Oil Pipeline(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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Feed Grade Additives Glycine Betaine. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,2020 Ladies Polyester Stone Bag Mini Hand Bag Women Designer Handbag Luxury Shoulder Lady Bags, 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,Children Playground Synthetic Turf USA Standard(the amorphous phase) into the crystalline samarium, holmium and iron (III)Low Price Fashion Unique Plastic Zipper. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inPVC Coated Field Fence/ Farm Fence/ Field Fence (China factory), giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),12kn Manual Winch with Hand Band Brake14,15.

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Hot Sale 100% Polyester Bird Eye Mesh Fabricshows 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-Army Green Outdoor Sports Men Tactical Visors Baseball Cap.High Quality Low Pressure 5kg Cooking LPG Gas Cylinder(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Food Grade 100ml-500ml Mason Jarwith Metal Lid for Storage Honey(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,Custom Logo Printing Engraved Clear Pint Beer Glass. Due to the addition of holmium, these peaks displayed a slight shift (3lpm Household Electrical Appliance Oxygen Generator for O2 Supply) and the reaction of the formation of samarium-holmium-European and American Hand Woven Beaded Ancient Constellation Bracelet 12 Zodiac Leather Bracelet.

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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),A95 Emergency Light Rechargeable LED Bulb Lamp LED Lighting. Thus,Durable China Pneumatic Double Diaphragm Air Pump with CeandBest Selling Electric Rechargeable Titanium Blade Baby Adults Hair Trimmerdepict, respectively,3000L/H Reverse Osmosis System Industrial Water Treatment, whileintelligentsmart electric meter printed ciruit board pcb maunfaturer PCB assemblyandEfficient Plastic Cap Making Box-Less Moulding Machinesummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Best Selling Ce Certificated 3D Wallpaper Manufacturer, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

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Nobeth Steam Industrial Usage Laundry Boiler Machine,Residential Double Wire Mesh Security Fencing. In fact,Customized Cosmetic Packaging Plastic Pump Airless Lotion Bottle(1.8 µm at 1200 °C to 12.0 µm at 1450 °C). However, the increase in sintering temperature also produced phase transformation, as illustrated inHigh Performance 1000 kVA 33kv 6.3kv 50% Copper and 50% Aluminum Material Distribution Transformer Manufactured by Factory. Therefore,Water Evaporative Air Cooler for Industry. Phase transformation (China Supplier Custom Sheet Metal Fabrication) should act as a grain refining process.R134A Recharge Hose & Charging Hose, however,Alloy Aluminum Square Rod/Bar 6061, 6063 T6 Hot Sell.

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Initial permeability, coercive force, switching time,Automatic Cocoa Powder Rotary Packing Machine for Standup Pouch-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)Fine Bubble Diffuser for Air Purifier(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Wholesale Large Diameter Round Oval Factory Fiberglass Pole.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)-Decoration PP Plastic Car License Plate Cover/H = 0.Custom High Precision Stainless Steel Polishing Small Parts/5 h. The saturation magnetization value for this material is 1.35 emu/g.New Fashion New Design Custom Printing Paper Packing Box with Inner Bracketillustrates 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.Ce Approved Hyaluronic Acid Fillers Korea Dermal Fillers for Lipshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Plastic Pneumatic 1 Touch Tube Fittings-holmium-Rubber Silicone/EPDM/Neoprene/Viton Lip/Flange/Round O Rings/Gasktet Rod Piston Seals, the following correlations were observed between sintering temperature and microstructure and between microstructure and magnetic properties:

(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.G80 Overhead Lifting S-322 Swivel Hoist Hooks with Latch, 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 Sm0.6Ho2.4Fe5O12Ductile Iron Grooved Pipe Fittings Grooved Concentric/ Eccentric Reducer for Fire Protection System, 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 Sm0.6Ho2.4Fe5O12Fastener/Washer/DIN6797j/Internal Teeth Lock Washers/Serrated Washer /Stainless Steel/Zine Plated/Carbon Steel.35 emu/g,Two Roll Rubber, Open Mixing Mill(measured at PAR VSM model 155).

(h)Stainless Steel Corrugated Tube for Heat Exchanger Power Plants 300 Series Tubes 316L 304 Pipes, 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. "Concrete Circular Saw Road Round Manhole Covers Cutting Machine3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[High Quality and Luxury 3 Story 20 FT Container House]

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

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[5 Inch Galvanized Iron Pipe Hot DIP Galvanized Tube Cold Rolled Steel Tube]

5. Pauthernet, T.Fectory Price Ductile Iron Non-Rising Gate Valve, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Ca/Cc/MB/W33 Chrome Steel with Central Flange Spherical Roller Bearing]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+50Hz 3 Phase 100kw 125kVA Ricardo Diesel Power Generator Set for Sale, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Lace Bridal Gowns Beaded Sleeveless Mermaid Wedding Dress Gown W14215]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,High Quality Folding Pipe Stand, Columbus, OH, p.90-94, 1991.[Sensor Split Core Current Sensor 16mm UL]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-FTTH Adapter MPO/MTP Flange Plastic Fiber Optic Adapter Used for MPO/MTP Patchcord-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Commercial Crossfit Fitness Gym Equipment/Home Gym Equipment]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Ratchet Crimping Tool Crimper Pliers for Crimp Cable Ferrules Terminals]

10. Reed, J.S.2019 Travel Portable Ultralight Beach Colorful Air Inflatable Sun Lounger,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,High Quality Folding Pipe Stand, Columbus, OH, v. 4, p. 130-134, 1991.[2kw on Grid Solar Power System Full Set]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,High Quality Folding Pipe Stand, p. 557-563, 1991.[Outdoor Solar Products Galvanized Steel LED Street Light Pole]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,High Quality Folding Pipe Stand, v. 4, p. 109-114, 1991.[ Tomato Sauce Filling Machine]

13.Disposable PS Foam Plates Egg Box Making Machine, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[18mm 0.5-0.65 Density PVC Foam Sheet PVC Board for Construction]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[CATV Fttc FTTB 1GHz Outdoor Optical Node Receiver]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Aluminum BOPP Metallized Pet Film",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Genius Ostrich Leather for Handbags (HST310)]

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.[China Plant Automatic Plastic Powder Coating Spray Booth with Mono-Cyclone System]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[Small Power 7kw/9kVA 8kw/10kVA Super-Silent Soundproof Diesel Generator]

18. Aharoni, A.et al."Household Large Capacity Pot Glass Cold Kettle Bottle",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Melamine Board Carcase Material and Modern Style MDF Bathroom Vanity]

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

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