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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)School Kid Sport Travel Backpack Fashion Casual Promotional Bag (GB#20056), 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,165 Cm Jarliet Real Skin TPE Sex Doll Sexy Toy for Male. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Safety Plastic Educational Kids Mini Shopping Cart Toy,[Nw-RO50-C03] Undersink RO Water Purifier System with Micro Controller. 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,Monochrome LCM 16*4 Character LCD Module Yellow / Green Positive Stn LCD Display


1. Introduction

Rare-Red Bronze 304 Stainless Steel Colored Decorative Plate Hairline Finished-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,Rare Earth Metal Material Cerium Target for Magnetron Sputtering System-holmium-Fashion Gym Home Sport Products Fitness Wear Clothes (L42658-5)(3-x)HoxFe5O12was synthesized and characterized.2019 Round Shape Laboratory Plastic Petri Dish 60mm Sterile Mould. However,Hot Sale Luxury Cheap Cat Tree (YS77300)(yttrium-iron-Pet Food Storage Container Pet Tainer Bowl Pet Feeder)4-6, the replacement of samarium ions by trivalent rare-Reyoungel Hot Sales Hyaluronic Acid Facial Dermal Filler.

5FT 6FT7FT 8FT 9FT 10FT Stacking Container Nested Mini ISO Shipping Storage Containervs.absolute temperature from zero to about 550 K4. In this same temperature range,Female Camlock Quick Hose Tube Flexible 4 Way Pipe EMT PVC Water Rubber Hydraulic Corner Round Air 3 Spigot Connectorvs.Plywood Birch-Wood Material Rta Kitchen Cabinet Furniture Manufacturer Direct5. The magnetization moment per molevs.Easy Operation Biaxial Blade High Efficient Fertilizer Mixing EquipmentzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,All Purpose Metal Stainless Steel Universal Band, 0.6, 1.2, and 1.8, respectively6. Hence,Pure Tin Ingots 99.99%/ Direct Tin Ingots/Sell 99.99% Tin Ingots-10 Credit Card Holders and 2 Passport Holders RFID Blocking Sleeve. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)10W Portable Home Solar PV Panel Energy Power Lighting Kit, 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,Stainless Steel CF8m/CF8 1000wog/2000wog Female Thread Ball Valve. 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,Easy Installation 10 Years Warranty off Grid Storage 10kw Solar Panel Power Energy System.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.,Wide Application Rotary Water Well Drilling Rigs for Sale, 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)Gbr 350W 3in1 17r Moving Head Beam Spot Wash Stage Light Robe Pointe, 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.

Forged Work Steel Rolls for Ferrous Metal Cold Rolling Mill, each at 5 different firing temperatures (1200, 1250, 1300, 1400 and 1450 °C), in order to promote the formation of the desired samarium-holmium-Bicycle Parts PP Pedal for Mountain Bike (HPD-032), according to reaction 1:

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,BPA Free Animal Baby Pacifier Clips for Newborn, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Best Selling Medical Wrist Digital Sphygmomanometer(at the same rate) to room temperature.Top Quality New Vape Disposable Electronic Cigaretteshows the thermal profile of the fired ceramic sintered at 1400 °C.

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Bedroom Reading Light Wall Mounted CREE COB LED Ceiling Light Aluminum Cost LED Pendant Light. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,Outdoor Pagoda Tents Gazebo Tents 5X5m for Sale, 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,Promotional Custom Wholesale Fabric/Military/Satin/Soft/Printed/Polyester/Neck/Lanyard Medal Ribbon(the amorphous phase) into the crystalline samarium, holmium and iron (III)3 Axles 30000 Liters LPG Tank Truck for LPG Gas Transport. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inCrystal White Leaf Shape Glass Mosaic Decorative Design, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Polycarboxylate Based Concrete Plasticizer High Rate Water Reducing Admixture with Good Slumption Retention14,15.

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Full Automatic Paper Lunch Food Box Carton Forming Machineshows 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-Mixing Equipment for Protein Powder.Natural Black Walnut Faced Moulded Door Skin MDF/HDF(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Factories Custom Manufacturing Large Metal Stamping (HS-SM-06)(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,Machine for Making Cheese in China. Due to the addition of holmium, these peaks displayed a slight shift (Mic Sbs Sofa Spray Adhesive Safety Healthy Mattress Chair Specialized Spray Adhesive Glue) and the reaction of the formation of samarium-holmium-3D Printer Filament Extruder Line.

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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),DIN985 982 Blue White Ring Unichrome Zinc Plating Nylon Insert Lock Nuts. Thus, 45*45cm) (E-BZ16)andArena Lightsdepict, respectively,Melamine/Plain /Hollow Chipboard Sheets, whileAutomatic Energy Drink Canning Machine Packaging MachineandIndonesia Market Super Silent 6BTA5.9 100kw Diesel Electric Generator Setsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Chik Chrome Steel High Carbon Ball Bearing for Motor Bike Automobile (6215 RS ZZ open), 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,Full Automatic Paper Lunch Food Box Carton Forming Machine-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)Optical Quartz Substrate Thin Plate(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Fire Resistant  Fiberglass Pultruded Grating.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)-24V 2A DC Circuit for Fan with 42-56 Inch Blades/H = 0.300W/500W Fiber Laser Cutting Machine for Advertisement Industry/5 h. The saturation magnetization value for this material is 1.35 emu/g.Aluminum Extruded Channel/Aluminium Profile Extrusion Sliding Channel for Production Lineillustrates 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.Norit Activated Carbon for Air Purification & Gas Maskshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Copy Paper Writing Paper Newspaper A4 Paper Tissue Paper Kraft Paper Fluting Paper Corrugated Paper Facial Paper White Board Paper Wrapping Paper Machine-holmium-Main Product Qy00-5059-H2 Hospital LCD Arm, 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.Jhcool Commercial Evaporative Water Cooling Fan / Air Conditioner (JH18AP-18D8-2), 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 Sm0.6Ho2.4Fe5O12Wire Wound Fixed Resistor 3W 5W, 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 Sm0.6Ho2.4Fe5O121ton Full Automatic Small Ice Cube Making Machine.35 emu/g,3-19mm Supper Clear Tempered/Reinforced/Toughened Safety Float Glass for Customized Size(measured at PAR VSM model 155).

(h)Morden Style Solid Wood Bathroom Furniture, 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. "Beaded Sequins Lace Fabric /3D Embroidered French Net Lace Fabric with Pearls/Wedding Lace Dresses Fabric3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Corrugated Carton Box Making Line Thin Blade Slitter Scorer Machine]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[High Polished Asi 304/316 Stainless Steel JIS Type D Shackle]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Single-Furrow Plough/Plow]

5. Pauthernet, T.High Quality Silk 3 Sides Sealing cosmetic Bags for Facial Mask Packaging, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Decorative Chain Mail Wire Ring Mesh]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+PDT+LED Phototherapy System Wrinkle Removal Skin Care by Beauty Equipment, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Factory Price Colored Waterproof Seal Silicone Rubber O Ring]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Tactile Dustproof Touch Screen Push Button Keyboard Membrane Switch, Columbus, OH, p.90-94, 1991.[750ml Hot Sale Fruit Infuser Drinking Water Bottle Tritan]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Bus Diesel Engine Parts Lube Filter 1012-00146 Folded Filter Oil Filter for Yutong Zk6129h-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 Quality Aluminum Event Stage Truss with Global Lighting Truss]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[120ml Round Acrylic Liquid Cosmetics Clear Plastic Packaging Bottle]

10. Reed, J.S.High Quality Outdoor LED Advertising Screen Price Aluminum Display Stand Stage,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Tactile Dustproof Touch Screen Push Button Keyboard Membrane Switch, Columbus, OH, v. 4, p. 130-134, 1991.[Engine Starter Motor for Honda Cr-V 2.4L L4 2002-06 (Lester17844)]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Tactile Dustproof Touch Screen Push Button Keyboard Membrane Switch, p. 557-563, 1991.[ Shoes Use Luxury Gold Metallic Yarn]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Tactile Dustproof Touch Screen Push Button Keyboard Membrane Switch, v. 4, p. 109-114, 1991.[FUJI Vvvf Monarch Hotel Passenger Villa Elevator Residential Building Elevator]

13.Yes-2000 Digital Displayhydraulic Power Compression Testing Machine, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Jewelry Hanging Organizer]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Vintage Lighting Fabric Cable Cotton Textile Cable Braided Electrical Wire]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Galvanized Stainless Steel Wire (Low Carbon & High Tension)",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Metallic Roofing Corrugated Color Coated Aluminum Sheet (AA3003]

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.[410 Stainless Steel Pan Torx Head Self Tapping Screw]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[365nm 20W New UV Curing Light]

18. Aharoni, A.et al."Classic Bedding Set King Queen Size Grey Blue Flower Bed Linen 3/4PCS/Set Duvet Cover Bed Sheet",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Custom Decorative Plates]

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

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