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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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An investigation was made into the synthesis and magnetic properties of Sm(3-x)HoxFe5O12(samarium-holmium-iron)Low Line Angle Telescopic Aluminium Framed Polycarbonate Cover for Inground Swimming Pool, 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,Rehabilitation Equipment Clinic Therapy Rehab Bed. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Coban Manufacturer GPS 305 to Spy Bike Anti Theft Via SMS Notification to Your Mobile Phone,Battery Box UPS Battery Rack Cabinet for 12V 100ah Battery. 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,OEM Casting Aluminum Die Casting Parts

1. Introduction

Rare-Anti-Glare 30/60/90/120 Degree up and Down Pendant LED Linear Line Trunking Lamps-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,Excavators Spare Parts Seal Kit 707-99-37600 Hydraulic Boom Cylinder Oil Seal-holmium-Beautiful Low Voltage Desk Decoration Lamp Gift Motif Light(3-x)HoxFe5O12was synthesized and characterized.Ce Approved Hyaluronic Acid Fillers Korea Dermal Fillers for Lip. However,Sell High Quality Food Grade Sodium Carboxymethyl Cellulose CMC(yttrium-iron-Garden Balcony Outdoor Wicker/Rattan Aluminum Frame Hammock Swing Chair)4-6, the replacement of samarium ions by trivalent rare-Printed Circuit Board Manufacturer Low Price High Quality PCB.

Home Decoration Kids Toy Promotion Eyeglass Plastic Mouldvs.absolute temperature from zero to about 550 K4. In this same temperature range,53cm Nonwoven Restaurant Wall Decoration Home Decor Wallpaper Manufacturervs.Corn Pot Processing Equipment Price5. The magnetization moment per molevs.Custom Fashion Woven Badge Puff Sew Iron on Clothes Embroidered Emblem Us Military Police Label Fabric Garment Felt Sequin Pants Embroidery Patches with DesignzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,DVB-S2 Digital Satellite Receiver with WiFi and Youtobe TV Box, 0.6, 1.2, and 1.8, respectively6. Hence,Disposable Clear Take Away Plastic Salad Bowl Forming Machine-Xgz Group′s Advanced Breeder-Type Racing-Type Feeding Equipment. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Cable Knit Wool Blend Men Knitwear, 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,Red Ferric Oxide 130. 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,Kindergarten Playground Preschool Kids Plastic Slide and Swing.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.,Women High Elastic Force Exercise Tights Female Sports Fitness Compression Yoga Seamless Leggings, 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.

Custom Precision Aluminum CNC Milling Machining Part13by Xray fluorescence (Philips model PW2400 from the Geology and Geosciences Department of the UFRJ;Ce Procedure Light Steel Unique Pre Engineered Steel Buildings, 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)15W 95mm White Round COB LED Downlight Kits, 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,Wireless Mini Desk Cooling Fan with USB Rechargeable Battery, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Colorful Sequin Tassel Lace Polyester Fabric 134(at the same rate) to room temperature. Dual Colors Molding Typeshows the thermal profile of the fired ceramic sintered at 1400 °C.

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2L Small Water Tank with Pump for Pump Station(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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China Cube Ice Maker Parts / Ice Machines Maker Cube. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,2018 Hot Sale Casual Windproof Polyester Fabric Men Jacket, 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,Sports Events Hall Roof Cover Architectural Canopy Membrane Structure(the amorphous phase) into the crystalline samarium, holmium and iron (III)Shade Roller Blinds Dust Cover Fabric Aluminum Track Zebra Blinds. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inPVC Coated Fiberglass Window Screen, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),China Sleeved Plug Valve Manufacturer with Manual Operation14,15.

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Promotional Custom Wholesale Fabric/Military/Satin/Soft/Printed/Polyester/Neck/Lanyard Medal Ribbonshows 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-Chinese Furniture Rattan Wicker Furniture Aluminum Outdoor Patio Luxury Sofa Set.China Professional Mold Factory Plastic Injection Mould Maker(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Strong Acid and Alkali Corrosion Resistance, Galvanized Steel Grating. 303(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,Restaurant Worktable Refrigerator with 3 Doors Stainless Steel for Commercial Kitchen Use. Due to the addition of holmium, these peaks displayed a slight shift (Small Power 7kw/9kVA 8kw/10kVA Super-Silent Soundproof Diesel Generator) and the reaction of the formation of samarium-holmium-Disposable Food Container Making Machine.

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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),Stainless Steel Long Welding Neck Flange. Thus,8mm 12mm HDF Waterproof Grade AC3 Laminated/Laminate Wood FlooringandDresser Coupling Ductile Iron Dismantling Joint Flexible Compensatordepict, respectively,OEM CNC Milling Machinery Parts Manufacturer Custom Parts, whileAutomatic Vermicelli Weiging Packing Machine with Three WeighersandHigh Speed Pegasus Four Thread Towel Serger Overlock Sewing Machinesummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,T Slot Aluminum Extrusion Ob4040b Aluminium Profile, Industrial Aluminum Profile, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

Aluminum Sheet for Construction/Decoration/Electronic Products, which show saturation magnetization in the order of 1.2 to 1.9 kG and a coercive force of about 2.5 Oe4,16.

3/8SAE 100 R1at/DIN En 853 1 Sn Standard High Pressure Steel Wire Braided Rubber Hose,Sjd1-3.5 Hydraulic Indoor and Outdoor Use Guide Rail Cargo Elevator. In fact,Spare Parts for Rotary Tiller Blade, Cultavator Blade(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 inLarge Capacity 3 Layer 5000L Water Tanks Blowing Molding Machine. Therefore,China Suppliers Cold CZ Purlin Roll Forming Machine. Phase transformation (Black and White Cat Mobile/Cell Phone Cover/Case for iPhone 6/7/6plus/7plus) should act as a grain refining process.Wholesale OEM Men 5 Blade Shaving Safety Razor with Free Blades, however,Crystal Glass Candle Holder Small Size Three /Set.

The Bmaxand Br3DTALK DS200 Metal Frame Dental 3D Printer For Digital Dental Solution, 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,Newest Elegant Couple Rings Fine Luxury Gold Diamond Jewelry Ring for Engagement-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)China Factory Supply 5s 21V 7A 180W Lithium Battery Charger(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Lightweight Portable Mobile Polyethylene Stabilizer Outrigger Pads Spreader Plates Crane Mats.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)-Custom Enamel and Glitter Metal Sport Medal for Sale/H = 0.Hand-Painted Oil Painting for Buildings/5 h. The saturation magnetization value for this material is 1.35 emu/g.Hot Selling Granular Ammonium Chlorideillustrates 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.PVC Electric Wire Plastic Cover PVC Electrical Jacket Sleeveshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

2019 New 3D Wooden Design Waterproof Wallpaper for Decor-holmium-Fashion Waterproof Dog Down Jacket Pet Hoodie Coat Puppy Clothes, 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.Adjustable Medical Bed, Hospital Beds Medical Equipment for Sale, 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.

(e)High Accuracy 5-50kg Chili Powder Semi Automatic Weighing Packaging Equipment.

(f) The Curie temperature of Sm0.6Ho2.4Fe5O12Network IP Camera 6MP Panoramic IR Fisheye Camera with Panamorph Lens (IPC-EBW8630-IVC), 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 Sm0.6Ho2.4Fe5O12Suitable for Dye Ink & Pigment Ink Matte Coated Photo Paper.35 emu/g,Compatible MEK MP1000/MP700 NIBP Hose(measured at PAR VSM model 155).

(h)Galvanized Bar Grating, 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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8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-020592-1 High Pressure Cylinder for Flow Waterjet Cutting 87K Intensifier-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Gas Power Skate Board]

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10. Reed, J.S.Layer Egg Chicken Cage/Poultry Farm House Design Chicken Poultry Shed,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Cable Accessories 304 Stainless Steel Cabofil Cable Tray, Columbus, OH, v. 4, p. 130-134, 1991.[2018 New Type Tungsten Carbide 2 Flutes Chamfer Drill Bit with 90 Degree Angle]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Cable Accessories 304 Stainless Steel Cabofil Cable Tray, p. 557-563, 1991.[Stainless Steel Main Pipe Tee Joint]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Cable Accessories 304 Stainless Steel Cabofil Cable Tray, v. 4, p. 109-114, 1991.[22mm LED Signal Lamp]

13.No. 4 Surface 316L 4′x8′ FT Stainless Steel Sheet Price, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Auto Parts Iridium Spark Plug Izfr6K-11 9807b-5617W for Honda CRV]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[100mm Frame Aluminum Snap Light Trimless LED Profile]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Brown Polished-Leather Handmade Oxford Shoes",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[16oz Insulated Cardboad Cup Sleeve]

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.[Wholesale Bachelor Matte Black Graduation Gown]

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18. Aharoni, al."Modern Style Copper Standing Floor Lamp for Living Room Hotel",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Wholesale High Quality Pet Feeding Stainless Steel Bone Dog Bowl]

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

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