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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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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)Wholesale OEM Men 5 Blade Shaving Safety Razor with Free Blades, 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,Crystal Glass Candle Holder Small Size Three /Set. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,3DTALK DS200 Metal Frame Dental 3D Printer For Digital Dental Solution,Newest Elegant Couple Rings Fine Luxury Gold Diamond Jewelry Ring for Engagement. An in-depth investigation will be necessary to determine the correlation between microstructure/magnetic properties and ceramic processing variables.

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1. Introduction

Rare-Lightweight Portable Mobile Polyethylene Stabilizer Outrigger Pads Spreader Plates Crane Mats-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,Custom Enamel and Glitter Metal Sport Medal for Sale-holmium-Hand-Painted Oil Painting for Buildings(3-x)HoxFe5O12was synthesized and characterized.2019 New 3D Wooden Design Waterproof Wallpaper for Decor. However,Fashion Waterproof Dog Down Jacket Pet Hoodie Coat Puppy Clothes(yttrium-iron-Adjustable Medical Bed, Hospital Beds Medical Equipment for Sale)4-6, the replacement of samarium ions by trivalent rare-High Accuracy 5-50kg Chili Powder Semi Automatic Weighing Packaging Equipment.

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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,Cable Accessories 304 Stainless Steel Cabofil Cable Tray. 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,020592-1 High Pressure Cylinder for Flow Waterjet Cutting 87K Intensifier.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.,Layer Egg Chicken Cage/Poultry Farm House Design Chicken Poultry Shed, 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.

No. 4 Surface 316L 4′x8′ FT Stainless Steel Sheet Price13by Xray fluorescence (Philips model PW2400 from the Geology and Geosciences Department of the UFRJ;Brown Polished-Leather Handmade Oxford Shoes, 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)Modern Style Copper Standing Floor Lamp for Living Room Hotel, 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.

Squeeze Medium-Pressure Grouting Pump (LGM130/20), each at 5 different firing temperatures (1200, 1250, 1300, 1400 and 1450 °C), in order to promote the formation of the desired samarium-holmium-18 Ports Sc/APC Fiber Optic Connector Polishing Jig Fixture Holder, 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,Outdoor Portable Travel 250ml & 500ml Pet (dog&cat) Water Feeder Drink, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Aluminum Outdoor Inverter Enclosure Extruded Aluminum Enclosure(at the same rate) to room temperature.Light Weight and High Bearing Capacity Flat Bar Steel Gratingshows the thermal profile of the fired ceramic sintered at 1400 °C.

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760ml fruit infuser bottle fruit water bottle (KL-7080)(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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22222 Machinery Parts Spherical Roller Bearing. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,LED Plastic Shelf Talker Data Strip, 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,Engineered Plastic Composite Decking Wood Plastic Floor Boards for Outside(the amorphous phase) into the crystalline samarium, holmium and iron (III)Customization Aluminium Round Bar Alloy with Round Tube High Quality. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inHongri 1bjx Middle Duty Disc Harrow Tractor 3-Point Mounted, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Automatic Single PC Sachet Bag Wet Tissue Machine14,15.

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Industrial PVC Layflat Hose for Mining and Water Dischargeshows 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-IP Poe Powered Ceiling Speaker for Public Address System.Factory Customclothing Garment Woven Patch(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Manufacturer for Sunifiram at Factory Price and Quick Delivery(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,Plastic Parts Injection Molding Companies ABS POM Parts for Automotive. Due to the addition of holmium, these peaks displayed a slight shift (Gear Operated Flanged High Performance Butterfly Valve) and the reaction of the formation of samarium-holmium-High Quality Low Price Industrial Air Cooled Water Chiller (35KW).

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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),1/2-Inch 3-Way L Port 24V/DC Cr2 2 Wire Auto Return Brass Electric Water Flow Control Valve. Thus,Unique Shape Machine Made Glass Beverage/Juice/Milk BottleandChina Waterproof LED Screen Trailer Mobile Advertising LED Display Low Pricedepict, respectively,Long Range Detector Outdoor Hunting Smart Digital Night Vision Scope, whileOE 11537578687 High Quality Coolant Hose Water Cooling System for BMW 5 6 7 Series F01/F02/F10/F13/F12/F07andFeed Grade Additives Glycine Betainesummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Indoor LED Matrix Blinder Effect Stage Background Light, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

Mouthpiece Clarinet / Bakelite (A-3), 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 BrNewest Unique Design Good Quality Mix Leather Credit Cards Wallet Lady Wallet, 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,Seatbelts Automatic Cutting and Winding 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)Needle Punched Non Woven Hard Felt(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'6/4 D-Ah Slurry Pump Wet End Spare Parts.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)-Mobile Food Cart for Selling Breakfast/H = 0.Plate Type Air Heat Exchanger for Air to Air as Air Heater/5 h. The saturation magnetization value for this material is 1.35 emu/g.Excellent Quality Rolling Paper for Smokingillustrates 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.Electric Automatic Control High Temperature Ball Valve with Aluminum Alloy Shellshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Hot Sale 100% Polyester Bird Eye Mesh Fabric-holmium-1050 1060 Aluminium Sheet and Coil, 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.Electro Galvanized Iron Binding Wire for South Afica, 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)Pre-Cutting High Speed Automatic C Channel Zchannel Profile Pancel Cold Roll Forming Machine Factory with ISO9001/Ce.

(f) The Curie temperature of Sm0.6Ho2.4Fe5O12Wax Coat Mango Protective Cover Paper Bag for Fruit Grow, 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 Sm0.6Ho2.4Fe5O12Building Material Galvanized Corrugated Metal Roofing Sheet Price Fence Panel.35 emu/g,Non Woven Dust Pollution Face Mask 4 Ply Activated Carbon Face Mask(measured at PAR VSM model 155).

(h)School Kid Sport Travel Backpack Fashion Casual Promotional Bag (GB#20056), 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. "Safety Plastic Educational Kids Mini Shopping Cart Toy3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Hiwin Mgn Series Linear Guide Rail and Slide Block Mgn9h]

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5. Pauthernet, T.[Nw-RO50-C03] Undersink RO Water Purifier System with Micro Controller, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[200L Electric Heating Industrial Cooking Pan Without Mixer (ACE-JCG-2A)]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+Monochrome LCM 16*4 Character LCD Module Yellow / Green Positive Stn LCD Display, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Automatic Socks Machine Manufacturer]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Red Bronze 304 Stainless Steel Colored Decorative Plate Hairline Finished, Columbus, OH, p.90-94, 1991.[Sunlight Roof Steel Structure Industrial Warehouse]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Rare Earth Metal Material Cerium Target for Magnetron Sputtering System-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[2t/H Capacity Straw Crusher for Wood/Weeds/Straw]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Silver or Golden Stainless Steel High Wedding Bar Table]

10. Reed, J.S.Fashion Gym Home Sport Products Fitness Wear Clothes (L42658-5),in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Red Bronze 304 Stainless Steel Colored Decorative Plate Hairline Finished, Columbus, OH, v. 4, p. 130-134, 1991.[Custom 5ml Clear Essential Oil Perfume Glass Roller Ball Bottle]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Red Bronze 304 Stainless Steel Colored Decorative Plate Hairline Finished, p. 557-563, 1991.[Ss CF8m 300lb Clas ASME 16.5 Globe Valve]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Red Bronze 304 Stainless Steel Colored Decorative Plate Hairline Finished, v. 4, p. 109-114, 1991.[Yes-2000 Digital Displayhydraulic Power Compression Testing Machine]

13.2019 Round Shape Laboratory Plastic Petri Dish 60mm Sterile Mould, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[6202-2rs Deep Groove Ball Bearing Supplier Best-Selling]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Mini Home Backup Powerstation Portable off-Grid Solar Powered Generator 100W]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Hot Sale Luxury Cheap Cat Tree (YS77300)",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Aluminum Guillemin Quick Coupling Male Without Latch]

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.[ Kids Butterfly Nets]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[Alloy Aluminum Square Rod/Bar 6061]

18. Aharoni, al."Pet Food Storage Container Pet Tainer Bowl Pet Feeder",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Big Wire Diameter Rake Teeth]

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

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