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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)200W 300W 400W 500W 600W 4D Fiber Transmission Laser Welding Machine for Metal for 2mm Laser Welder, 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,750kVA~3000kVA Mtu Powered Open Type Diesel Generator with Ce/ISO. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,750ml Hot Sale Fruit Infuser Drinking Water Bottle Tritan,Bestsub Sublimation Pillow Cover (Polyester, 45*45cm) (E-BZ16). 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,Hotel Safe for 5 Stars Hotel with Key Button Luminous


1. Introduction

Rare-Ceramic Foam Filter for Metal Foundry Ceramic Porous Honeycomb Foam Filter-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,Commercial Aluminium Folding Canopy / Shelter / Tent with Custom Printing-holmium-4.3 Inch Rearview Mirror Dash Cam (8411)(3-x)HoxFe5O12was synthesized and characterized.Indonesia Market Super Silent 6BTA5.9 100kw Diesel Electric Generator Set. However,Amber Tube Glass Bottle with Black Dropper for Essential(yttrium-iron-Linear Push Pull Solenoid Actuator for Massage Chair)4-6, the replacement of samarium ions by trivalent rare-IP67 Waterproof Metal Elevator 19mm Start Push Button Membrane Switch with Socket.

Military Grade Big Lens Night Vision Rifle Scope for Salevs.absolute temperature from zero to about 550 K4. In this same temperature range,Flip Aluminum Remote Key Fob Shell New for Land Rover Range Key Car Case for Range Rover Key Cover Case 5 Buttonsvs.Single-Furrow Plough/Plow5. The magnetization moment per molevs.Vertical Key Copy/Copying Machine for LocksmithzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,Exclusive Automated Carton Erecting Machine for Food Box, 0.6, 1.2, and 1.8, respectively6. Hence,Machined Brass Cage Automotive Spherical Roller Bearing-Golden Crystal Handmade Elegant Wedding Tiara. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)1080P Wall Mount LCD Display Indoor Digital Signage, 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,Manufacturer Plastic Injection Mould Molding Nylon PP Injection. 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,Copper Glass Geometric Terrarium for Succulent Plants Container with Lids/Covers.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.,Heavy Duty Electromagnet for Lifting Scrap MW5 Series, 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)Customized Automotive Cable Wiring Harness for Car, 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,Colored Silicone NBR O-Rings Seals, Rubber O Ring with High Strength, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,High Pressure Hose Electric Wire Automatic Control Braiding Machine(at the same rate) to room temperature.Oval Whisky Fudge Tin Box for Candy Confectionary Sweets Packagingshows the thermal profile of the fired ceramic sintered at 1400 °C.

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12 Yellow Spirit Level Aluminium Level Ruler Magnetic. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,High Quality 42 Inches Smart HD Color 4k LED TV, 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,Concrete Chloride Ion Permeability Tester(the amorphous phase) into the crystalline samarium, holmium and iron (III)Genius Ostrich Leather for Handbags (HST310). The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inHigh Tensile Strength PP/Pet Woven Geotextile for Dam Breakwater, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Network Cable Copper Standard SFTP/FTP CAT6 LAN Cable Computer Monitor Security14,15.

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5ml Parfum Kenka Caneta Aluminium DOT Anodized Compact Glass Refillable Bottle Empty Pump Atomizing Spray Perfume Bottleshows 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-100kVA 80kw Electric Power Diesel Generator Price in India.Sanitary Stainless Steel CF8m 1 Inch Butterfly Valve(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Corrugated Carton Box Making Line Thin Blade Slitter Scorer Machine(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,DC6-9-12V Power Spdt/Spst 1.1/4′′ Motorised Zone Ball Valve (HTW-EG). Due to the addition of holmium, these peaks displayed a slight shift (Manufacturer Movable Painting Spray Booth for Garage) and the reaction of the formation of samarium-holmium-Print Rigid Custom Paper Drawer Box Gift Packaging.

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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),Laser Engraving Machine/Marking /Engraver Equipment for Metal Sheet/Carbon Steel/Aluminum/Copper/Wood Bamboo Plastic Handicraft Mark. Thus,Non-Woven Bonded 100% Polypropylene Solution Dyed Fabric for Outdoor CoversandCustomized Gold Indoor Marathon Medal for Souvenir (113)depict, respectively,Drum Type Food Seasoning Chemical Chinese Medicine Powder Mixer, whileHigh Quality Artificial Grass for Football FieldsandModern Minimalist Interior Acrylic LED MD2018 Square Pendant Lightsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,LPG Tanker Trailer Truck, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

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The Bmaxand BrRigging Hardware Turnbuckles with Hook and Eye, a situation that would have been different had a denser green compact been sintered (at a lower temperature), producing smaller grain-sizes after sintering.

Initial permeability, coercive force, switching time,Customized FRP Pultrusion Fiberglass Profiles for Cooling Tower-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)Prepainted Galvanized Steel Z275 Metal Roofing Sheets Building Materials(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'25mm Disposable Syringe Filter Lab Filtration with Luer-Lock.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)-High Quality 200ml Transparent Glass Frosting Rum Alcoholic Glass Bottle/H = 0.Printing Coloring Cardboard Children Book Pop up Book/Pop up Book Printing/5 h. The saturation magnetization value for this material is 1.35 emu/g.Colorful Sequin Tassel Lace Polyester Fabric 134illustrates 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.Superior Commerical Indian Spice Grinder for Clients′ Demandshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Used Beer Water Cooled Magnet VSD Screw Air Compressor High Quality Stationary Atlsa Copco Ga VSD Air Compressor-holmium-YALAN DWB1 Metal Bellow Mechanical Seal for Cryogenic Pumps, 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.Bamboo Laptop Stand Computer Desk Tablet Table Bt-2217, 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 Sm0.6Ho2.4Fe5O12Rehabilitation Equipment Clinic Therapy Rehab Bed, 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 Sm0.6Ho2.4Fe5O12Coban Manufacturer GPS 305 to Spy Bike Anti Theft Via SMS Notification to Your Mobile Phone.35 emu/g,Battery Box UPS Battery Rack Cabinet for 12V 100ah Battery(measured at PAR VSM model 155).

(h)OEM Casting Aluminum Die Casting Parts, 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. "Excavators Spare Parts Seal Kit 707-99-37600 Hydraulic Boom Cylinder Oil Seal3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Attractive LED Stage Giant Inflatable Butterfly]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[4500 Psi High Pressure Air Compressor]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Sharp No Chipping Electroplated Diamond Marble Tile Saw Blade]

5. Pauthernet, T.Beautiful Low Voltage Desk Decoration Lamp Gift Motif Light, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Mouthpiece Clarinet / Bakelite (A-3)]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+Ce Approved Hyaluronic Acid Fillers Korea Dermal Fillers for Lip, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Yl10.2 Solid Carbide Rods with Ground & Unground]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Sell High Quality Food Grade Sodium Carboxymethyl Cellulose CMC, Columbus, OH, p.90-94, 1991.[Pre Engineered Light Steel Structure Building]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Garden Balcony Outdoor Wicker/Rattan Aluminum Frame Hammock Swing Chair-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Single Phase Compressors Oxygen Air Blower for Fish Farm Malaysia]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Decorative Stainless Steel Wire Mesh]

10. Reed, J.S.Printed Circuit Board Manufacturer Low Price High Quality PCB,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Sell High Quality Food Grade Sodium Carboxymethyl Cellulose CMC, Columbus, OH, v. 4, p. 130-134, 1991.[API 5L Psl1 5 Sch40 Pipeline for Petroleum Industry]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Sell High Quality Food Grade Sodium Carboxymethyl Cellulose CMC, p. 557-563, 1991.[Recycle 100% LDPE Soft Loop Handle Plastic Gift Bag]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Sell High Quality Food Grade Sodium Carboxymethyl Cellulose CMC, v. 4, p. 109-114, 1991.[100% Microfiber Mulberry Good Gift Christmas Custom Screen Print Silk Necktie]

13.Home Decoration Kids Toy Promotion Eyeglass Plastic Mould, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Extruding Kneader Machine]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Auditorium Theater Seating Rocking Cinema Seat Price Shaking Chair (EB02)]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "53cm Nonwoven Restaurant Wall Decoration Home Decor Wallpaper Manufacturer",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Laser Inner Engraving Engine for Crystal Cube for Selling on Line]

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.[Melamine/Plain /Hollow Chipboard Sheets]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[One Channel Single Model Fiber Optic Rotary Joint Manufacturer]

18. Aharoni, A.et al."Corn Pot Processing Equipment Price",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Gas Service]

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

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