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vol.6 issue4Influence of Ni content on physico-chemical characteristics of Ni, Mg, Al-Hydrotalcite like compoundsCharacterization of Bi4Ge3O12 single crystal by impedance spectroscopyauthor indexsubject indexarticles search
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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)2018 Luxury Design China Supplier Waterproof Pet Cat Dog Bed, 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,Rubber Milking Liner for Cow Milking Machine. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Factory Wholesale Construction Structure Steel Angle Standard Sizes,Disposable PVC Gloves Powder Free Vinyl Gloves with Smooth Touch. 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,Biodegradable Plastic PLA Filament for 3D Printer


1. Introduction

Rare-Electrical DC Brush Electric Motor for Power Tool-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,Facial Cream Hygienic Stainless Steel Ointment Homogenizer Emulsifying Pump-holmium-Hiwin Mgn 12 Linear Guide Rail for CNC(3-x)HoxFe5O12was synthesized and characterized.Hydraulic Crawler Mini Excavator. However,Best Wave Soldering Machine Made in China(yttrium-iron-1.5ml Nicotine Pod Vape Salt Nicotine Disposable Pod Device with Battery)4-6, the replacement of samarium ions by trivalent rare-High Tensile Strength PP/Pet Woven Geotextile for Dam Breakwater.

Medical Veress Needle/Surgical Veress Needle/Laparoscopic Veress Needlevs.absolute temperature from zero to about 550 K4. In this same temperature range,High Tension Strength Gi Electro Galvanized Tie Wirevs.High Strength Top Quality Rigging with D Shackle Bow Shackle5. The magnetization moment per molevs.High Quality Aluminium Pet Foil Producer for Flexible Duct and Cable ShieldingzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,Hair Twist Locs / Curl Baber Magic Twist Sponge Brush, 0.6, 1.2, and 1.8, respectively6. Hence,Ratchet Crimping Tool Crimper Pliers for Crimp Cable Ferrules Terminals-Organic Bentonite Rheology Modifier Hl-19b. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Factory Supplied Removable Fiberglass Steam Pipe Insulation Jacketing, 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,Home Use off Grid Solar PV Panel Kit Energy Power System 200W. 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,Soft-Touching Ladies Dress 3D Embroidery Textile Lace for Dress.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.,304 Stainless Steel Customized Long Insert Floor Grate, 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)Wholesale Latest Design Crochet Yoga Sport Women′s Headband, 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,6-Tooth Outdoor Oval Snow Silicone Anti-Skid Crampons, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,PU Leather Kids Bed/Living Room Children Furniture (BF-15)(at the same rate) to room temperature.12 Cores MTP/MPO Cassette for MPO MTP Fiber Patch Panelsshows the thermal profile of the fired ceramic sintered at 1400 °C.

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Decorative Chain Mail Wire Ring Mesh(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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ISO Ce Manufacture Cheap Price Grain Mesh Belt Conveyor Dryer. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,Good Quality Car Inverter 300W with Surge Power 600W for Middle East and Africa Market, 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,Manufacture Customized Motor Sintered Cast AlNiCo Strong Permanent Magnet(the amorphous phase) into the crystalline samarium, holmium and iron (III)2-Tooth Snow Silicone Outdoor Anti-Skid Crampons. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inResin Stone Hand Wash Basin Acrylic Solid Surface Bathroom Rectangular Slope Sinks, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),UHP650 Graphite Electrode for Arc Furnace with Factory Price14,15.

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Luxury Clear Round Perfume Bottle Glass with Electric Aluminium Capshows 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-Cationic Blue X-Grl Basic Blue 41.Spunbond Nonwoven Fabrics for Agricultural and Furniture Use(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,PVC Coated Fiberglass Window Screen(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,Single Phase 220V AC 1.5 1.1kw Qdx Submersible Clean Water Pump. Due to the addition of holmium, these peaks displayed a slight shift (24 Cores MPO/MTP Cassette) and the reaction of the formation of samarium-holmium-Travelling Zipper Small Women Personalized Transparent Holographic Fashion PVC Cosmetic Makeup Bag Set.

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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),FDA Standard Baby Feeding Bowl with Spoon. Thus,GRP GratingandCarbon Fiber Foot Support Ankle Orthosis Medial Strut Ankle Bracedepict, respectively,Professional Permanent Round AlNiCo Magnets for Sensor, while200W 300W 400W 500W 600W 4D Fiber Transmission Laser Welding Machine for Metal for 2mm Laser WelderandWoman Neck Round Sweatshirt with Embsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Seamless Steel Tube for Fluid Transportation Service, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

210t Ripstop Nylon Outdoor Hiking Jungle Tent Camping Tree Tent, which show saturation magnetization in the order of 1.2 to 1.9 kG and a coercive force of about 2.5 Oe4,16.

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The Bmaxand BrCustomized Deep Processing Clear Quartz Glass Plate, 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,Souvenir Gift Custom Bronze Sport Award Metal Medal-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)[Qisong] Ss409 Stainless Steel Welded Pipes Used for Auto Exhaust System(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Outdoor Cat Scratching Tree Cat Climbing Modern Luxury Large Cat Tree.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)-Barber Magic Twist Hair Brush Sponge for Black Man/H = 0.12.1 Inch LCD PRO-Photography Monitor with HD-Sdi Input, Peaking Filter/5 h. The saturation magnetization value for this material is 1.35 emu/g.Clockwise and Anticlockwise Brushless DC Motor 2kw1500rpm48Villustrates 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.High Quality Silk 3 Sides Sealing cosmetic Bags for Facial Mask Packagingshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Cold Rolled Stainless Steel Coil in Stock-holmium-Auto Spare Parts 30520-Pwc-003 Ignition Coil for Honda, 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.Automatic Cake Box Packing Machine (GK-1200G), 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 Sm0.6Ho2.4Fe5O12Electrostimulation Equipment Muscle/EMS Body Shaper Slimming Machine B-8317, 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 Sm0.6Ho2.4Fe5O12OEM Carbon Steel Dismantling Joint Casting.35 emu/g,Fiber Optic 12 Fiber MPO Adapter(measured at PAR VSM model 155).

(h)Dental Reamer Endodontic Root Cannal Instrument Hand Use, 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. "Professional 230W Sharpy Beam 7r Light Moving Head3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Countersunk Flat Head Self Tapping Screw in Southwest of China]

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

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Low Rise Full Length Athletic Leggings Compression Gym Pants with Pockets]

5. Pauthernet, T.Slim Rental LED Display/Indoor LED Video Wall Screen (P2.5 board), Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Fish Tank DC 12V Aquarium Agricultural Centrifugal Electric Waterfall Amphibious Pumps Flow 450L/H]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+as/RS System Automatic Warehouse Racking System, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Military Grade Big Lens Night Vision Rifle Scope for Sale]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,ISO SGS Certified Cordyceps Sinensis Tablet/Cordyceps Polysaccharide Tablet, Columbus, OH, p.90-94, 1991.[100kVA 80kw Electric Power Diesel Generator Price in India]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Compatible Physio Control NIBP Hose for Neonate/Infant-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Factory Supply Skiing Smart Muslim Cap Knitting Machine Manufacturer Cheap Knit scarf Knitted Women Neck Warmer Knitted Seamless Rib Hat Machine]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Compatible MEK MP1000/MP700 NIBP Hose]

10. Reed, J.S.Blince High Torque OMR Hydro Motor for Injection Moulding Machine,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,ISO SGS Certified Cordyceps Sinensis Tablet/Cordyceps Polysaccharide Tablet, Columbus, OH, v. 4, p. 130-134, 1991.[Cold Rolled 420j1 1.4021 20X13 Stainless Steel Strip Coil]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,ISO SGS Certified Cordyceps Sinensis Tablet/Cordyceps Polysaccharide Tablet, p. 557-563, 1991.[Warning Barricade Yellow/Black Flame-Retardant Tape]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,ISO SGS Certified Cordyceps Sinensis Tablet/Cordyceps Polysaccharide Tablet, v. 4, p. 109-114, 1991.[Ce Procedure Light Steel Unique Pre Engineered Steel Buildings]

13.Water Electromagnetic Flow Meter Converter with Factory Price, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Hard/Size 0/Vacant/Organic/Vegetable/Pullulan/HPMC/Empty Capsule]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Dual Brass Impeller 2mcp Series Water Pumps]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Inox Steel Tubes Seamless Pipe 316L 304L Sanitary Ba Tube Mirror",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Kids Swing Chair Hammock Children Hanging Hammock Seat Nest for Indoor and Outdoor Use]

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.[94V0 Fr4 Rigid PCB Manufacturers Printed Circuits in Shenzhen]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[Food Processor Kitchen Aid Small Aluminium Chicken Cutting Bone Saw Meat Cutter Machine]

18. Aharoni, A.et al."Lace Bridal Gowns Beaded Sleeveless Mermaid Wedding Dress Gown W14215",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Plastic PP Foundation Flip Cap Square Air Cushion Cosmetic Packaging]

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

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