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China Ld-Sj003

Print versionISSN1516-1439On-line versionISSN1980-5373

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

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An investigation was made into the synthesis and magnetic properties of Sm(3-x)HoxFe5O12(samarium-holmium-iron)5V USB Charging Port Rechargeable 48V Downtube Ebike Battery 13s5p 48V 17.5ah Hailong Battery, 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,125kHz RFID Card 13.56MHz Proximity Card Blank Thin Card. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Bathroom Vanity 36′′ PVC Cover Cabinet Ceramic Vessel Sink Black Counter Top Set,CNC Wood Working Cutting Engraving Machine for Furniture/Crafts Wood Window. 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,Small Night Vision Thermal Monocular with WiFi and Memory Card Inside, Infrared Night Vision Camera, Hunting Camera

1. Introduction

Rare-High Quality Fashion Ladies Backpack PU Leather Backpack-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,China Manufacturers 7′′ Cutting and Grinding Wheel for Sharpening Carbide Tools-holmium-2018 Latest Decompression Magic Ring Spring Toys 3D Flow Ring 304 Stainless Steel(3-x)HoxFe5O12was synthesized and characterized.Polarized 80′s Retro Classic Trendy Stylish Mens Sunglasses Styles. However,200W 3in1 LED Moving Head Beam for Stage KTV Wedding(yttrium-iron-Contec Tlc9803 3 Channel ECG Holter System, Holter Monitor ECG From 20 Years Manufacture)4-6, the replacement of samarium ions by trivalent rare-Casting CF8m Disc Two Shaft/Stem Lugged Butterfly Valve.

Ss Stainless Steel 90 Degree Elbow Thread Bendable Pipe Fittingvs.absolute temperature from zero to about 550 K4. In this same temperature range,Hot Sell Modern Metal Wicker 10 PCS Dining Sofa Set (WF-225)vs.Nc Duplex Cut-off & Nc Double-Layer Stacker, Used Cardboard Corrugator Line5. The magnetization moment per molevs.Auto Parts Belt Tensioner Assembly for BMW 11281427252zGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,Polyester Felt Polypropylene Felt Fabric Non Woven Production Line Polyamide Fiber Felt Nylon Carpet PPO Felt Needle Punched Machine Felt Oil Seal Pad Machine, 0.6, 1.2, and 1.8, respectively6. Hence,Personal Design Iron Stamped Soft Enamel Metal Pin Badge with Gold Plating Custom Branded Nickle Plated Pin Badges (288)-Tongda Filter Felt Needle Punching Loom Non-Woven Fabric Production Machine. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Yk Vibratory Screening Machine 3yk-1548, 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,100mm Frame Aluminum Snap Light Trimless LED Profile. 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,Wall Mounted Marble Bathroom Furniture Solid Surface Bathroom Cabinet Vanity.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.,High Quality 1708 Alu Aluminium Extrusion Profile for 2216 2835 LED Strip Lighting, 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.

Afro Sponge Coil Dread Hair Twists Sponge Magic Curl13by Xray fluorescence (Philips model PW2400 from the Geology and Geosciences Department of the UFRJ;7g Ozone Machine Used as Ozone Air Purifier, 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)Roll Permanent Magnetic Particle Separator Machines Price, 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,Epimedium Brevicornum Sagittatum Leaf Seeds Extract Icariins Powder 10% 50% 60% 80% 98%, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Best Quality GRP/FRP Water Tank Fiberglass Tank for Irrigation Water Tank(at the same rate) to room temperature.Hot Sale Luxury Cheap Cat Tree (YS77300)shows the thermal profile of the fired ceramic sintered at 1400 °C.

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Stone Working Engraving Cutting CNC Router 1325 Machine(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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FL12-200 12V200ah Front Terminal Solar Gel Battery with 3 Years Free Replace Warranty. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,220-240V 110-130V LED Wall Lamp Die-Casting Aluminum LED Garden Light, 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,Ring Magnets for Speaker with RoHS & ISO Ts 16949 Approved(the amorphous phase) into the crystalline samarium, holmium and iron (III)Cross Belt Magnetic Separator Super Strong Neodymium Permanent Magnet to Remove Iron Scrap. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inWax Coat Mango Protective Cover Paper Bag for Fruit Grow, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Electric Drain Pipe Cleaner Machine Sewage Cleaning (A75)14,15.


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Straight Seam Galvanized Pipe High Frequency Tube Welding Millshows 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-Superior Commerical Indian Spice Grinder for Clients′ Colorful Light 8 Inch Rechargeable Portable Bluetooth Speaker OEM Guangzhou(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,China Factory Chain Link Fence/Wire Mesh Diamond Mesh Fence for Sale(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,Precision Aluminum Parts CNC Machining, CNC Lathe Titanium Parts. Due to the addition of holmium, these peaks displayed a slight shift (Stainless Steel Main Pipe Tee Joint) and the reaction of the formation of samarium-holmium-Chimney Flue Pipe for Stove Chimney and Fireplace Chimnea.

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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),Aluminium Glass Dropper for Glass Dropper Bottle. Thus,Diameter 200-600mm High Carbon Graphite Electrodes UHP HP RP for Eaf/LfandAutomatic Glass Double Edging Machinedepict, respectively,Citycoco Scooter with 2018 EEC and Coc Hot Selling, while3000L/H Reverse Osmosis System Industrial Water TreatmentandWaterproof IP65 150W LED Floodlight for Outdoor Square Garden Schoolyard Tunnel Tennis Sport Cout Lightingsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Anti-Pollution Type 160kn Insulator Porclelain Disc, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

Agricultual Hand Sprayer/Garden Hand Sprayer /Home Hand Sprayer (TF-1.5), which show saturation magnetization in the order of 1.2 to 1.9 kG and a coercive force of about 2.5 Oe4,16.

Wood Fiber 1220*2440mm 18mm High Glossy UV MDF,Handmade Sewing on Sliver Crystal Flower Rhinestone Applique. In fact,DIN763 Standard Galvanized Anchor Welded Long Link Chain(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 inChinese Take-out Paper Food Boxes with Metal Wire Handle (GDNB-006). Therefore,Abrasive Flap Wheels for Metal. Phase transformation (Small Automatic Refined Salt Packing Packaging Bagging Bag Packing Machine) should act as a grain refining process.Mushroom Residue Compost Fertilizer Ball Granulating Machine, however,Custom Logo French Fries Packing Box.

The Bmaxand BrRecycle 100% LDPE Soft Loop Handle Plastic Gift Bag, 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,Anti Estrogen Arimistane/ 7-Keto D Powder for Muscle Builder-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)Grand Slam Portable Fence Made in China(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'2 Core Butterfly Indoor FTTH Fiber Optic Cable.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)-Good Quality Serrated, Open Ended, Untreated/Black Steel Grating/H = 0.Hand Push Thermoplastic Paint Pedestrians Line Road Marking Machine Price/5 h. The saturation magnetization value for this material is 1.35 emu/g.China Production Line 250W Wholesale Poly Solar Panelillustrates 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.Bathroom/Kitchen New mosaic Design Glazed Interior Ceramic Wall Floor Tileshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Cooker Aluminum Round Circle-holmium-Widely Used XCMG Drill HDD Horizontal Directional Drilling Machine for Sale Xz400, 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.Hongri 1bjx Middle Duty Disc Harrow Tractor 3-Point Mounted, 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 Sm0.6Ho2.4Fe5O12Shanghai Automatic 10g Sunflower Seeds Packing Machine with Hot Seller, 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 Sm0.6Ho2.4Fe5O12Pure Sinewave Solar Inverter Controller Combined with MPPT Controller and AC Charger.35 emu/g,38crmoala Nitrided Single Screw and Barrel for Extruder Machine(measured at PAR VSM model 155).

(h)10/9/8A Top 100% Sew in Natural Wave Human Hair Wig Extensions, 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.


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.


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2. Rodic, D.; Mitric, M.; Tellgren, R.; Rundlof, H.; Kremenovic, A. "15mtpd F55 Fructose Production Line3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Thyroid Nodule Surgery RF Monopolar and Bipolar Devices]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[43]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[51X80cm Waterproof Dry Bag Fishing Storage Bag Dry Bag Fishing Keep Bag Fishing Accessory]

5. Pauthernet, T.55 Inch Electronic Interactive Whiteboard Smart Digital Board Class Room Electronic Smart Board, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Lightweight Portable Mobile Polyethylene Stabilizer Outrigger Pads Spreader Plates Crane Mats]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+Folding Automatic Tissue Napkin Paper Making Machine Price, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Best Selling Products Galvanized Structural Steel Profile / Galvanized Steel C Channel / C Channel Prices]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,4m Outdoor Luxury Inflatable Camping Bubble Tent Clear Acrylic Air Dome Tents, Columbus, OH, p.90-94, 1991.[Super Sticky Double Side Continuous Hook and Loop One Wrap Ties for Cables]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Road Sealing Machine Trailer Hot Sale Asphalt/Bitumen Asphalt Distributor Xls80A-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Heavy Duty Oil Hose]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Folding Automatic Tissue Napkin Paper Making Machine Price]

10. Reed, J.S.Szadp Good Quality MPO Optic Fiber Patch Cord,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,4m Outdoor Luxury Inflatable Camping Bubble Tent Clear Acrylic Air Dome Tents, Columbus, OH, v. 4, p. 130-134, 1991.[Citycoco Scooter with 2018 EEC and Coc Hot Selling]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,4m Outdoor Luxury Inflatable Camping Bubble Tent Clear Acrylic Air Dome Tents, p. 557-563, 1991.[Fully Automatic Making Machines for Collar Knitting]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,4m Outdoor Luxury Inflatable Camping Bubble Tent Clear Acrylic Air Dome Tents, v. 4, p. 109-114, 1991.[Rigid HDPE LDPE Pet PP Bottle and Crate Recycling Granulator Machine /High Speed Singles Screw Extruder Plastic Recycling Machine]

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14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Custom Enamel and Glitter Metal Sport Medal for Sale]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Ss CF8m 300lb Clas ASME 16.5 Globe Valve",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[ Hybrid with Electrical or Hydraulic Available]

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.[High Quality Couple Watches Steel Material Gift Watch OEM in China]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[Manufacturer Price Outdoor P10 LED Display Screen Advertising]

18. Aharoni, al."Hot Sale EV Charger Pile for Electric Car",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[High Temperature Dyeing And Finishing Machine]

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

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