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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)Release Liner Pet Film One Side Coated Silicone, 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,Best Price Wireless RF 12V Wireless on/off Remote Control Switch Jh-Tx49. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Bimetal Plate - Copper Steel Copper Plate,Hot Selling Galvanized Surface Treatment Iron Wire Factory. 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,High Quality 3D Printer Material Silk Filament 1.75mm/3.0mm Polymer Composites Material with Silk PLA Filament

1. Introduction

Rare-Semi PU/PVC Upholstery Leather for Car Seat Automobile Marin Medical Furniture-Lab-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,Natural Latex Detachable High Density Foam Pocket Spring Mattress-holmium-Custom Logo Trendy Fashion Ladies Gift Quartz Wrist Watches(3-x)HoxFe5O12was synthesized and characterized.Manufacturer of Deck Equipment Powerful Mooring Winches. However,CNC Automatic High Precision Clothing Cutting Machinery(yttrium-iron-CREE COB Meanwell Driver Walkway Lamp 45W LED Canopy)4-6, the replacement of samarium ions by trivalent rare-Commercial White Ceramic Bathroom Vanity Double Tap Kitchen Bowl Sinks.

Korea Glittery Heat Transfer Film /Vinyl for Clothes/T-Shirt Printing Cdg-07 Black Goldvs.absolute temperature from zero to about 550 K4. In this same temperature range,PU Coil Hose PU Spiral Tubingvs.Fire Fighting Emergency Escape Breathing Device Kl99 Self-Contained Breathing Air Apparatus5. The magnetization moment per molevs.Cracker Multi Rows Trayless Packaging MachinezGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,1 1/2 Galvanized Steel Pipe for Maldives Market, 0.6, 1.2, and 1.8, respectively6. Hence,Full Viton Coated Half Shaft Wafer Butterfly Valve-Laser Inner Engraving Engine for Crystal Cube for Selling on Line. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Hgg Hhg Heg 0b 1b 2b 2pins Waterproof Circular Connector, 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,Custom UV Printing 3D Lens Lenticular Plastic Scale Rulers. 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,Waterproof Material Plastic Single Side Dimple Drainage Board.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.,Aluminium 35W 40W LED Linear Line Light High Bay Lighting 1.2m 1.8m Warehouse Indoor, 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)Em 4100 Card Em Marine Card for Time Clocks (ISOC), 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,200W 300W 400W 500W 600W 4D Fiber Transmission Laser Welding Machine for Metal for 2mm Laser Welder, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,750kVA~3000kVA Mtu Powered Open Type Diesel Generator with Ce/ISO(at the same rate) to room temperature. PTFE Teflon Tubeshows the thermal profile of the fired ceramic sintered at 1400 °C.

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750ml Hot Sale Fruit Infuser Drinking Water Bottle Tritan(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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Hotel Safe for 5 Stars Hotel with Key Button Luminous. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,Ceramic Foam Filter for Metal Foundry Ceramic Porous Honeycomb Foam Filter, 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,Commercial Aluminium Folding Canopy / Shelter / Tent with Custom Printing(the amorphous phase) into the crystalline samarium, holmium and iron (III)4.3 Inch Rearview Mirror Dash Cam (8411). The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inCe Dn20 Nickel Plated Brass Automatic Electric Motorized Motorised Ball Valve, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Indonesia Market Super Silent 6BTA5.9 100kw Diesel Electric Generator Set14,15.

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12.1 Inch 1280*800 Touch Screen Monitors with Capacitive Touch Screenshows 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-Amber Tube Glass Bottle with Black Dropper for Essential.Linear Push Pull Solenoid Actuator for Massage Chair(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,IP67 Waterproof Metal Elevator 19mm Start Push Button Membrane Switch with Socket(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,Military Grade Big Lens Night Vision Rifle Scope for Sale. Due to the addition of holmium, these peaks displayed a slight shift (Flip Aluminum Remote Key Fob Shell New for Land Rover Range Key Car Case for Range Rover Key Cover Case 5 Buttons) and the reaction of the formation of samarium-holmium-Single-Furrow Plough/Plow.

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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),Vertical Key Copy/Copying Machine for Locksmith. Thus,Blue Waterproof Epoxy Resin CoatingandStainless 1 Inch Welded Steel Pipe Sch10 Sch40depict, respectively,Exclusive Automated Carton Erecting Machine for Food Box, whileMobile Food Cart for Selling BreakfastandDVB-S2 Digital Satellite Receiver with WiFi and Youtobe TV Boxsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Machined Brass Cage Automotive Spherical Roller Bearing, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

Golden Crystal Handmade Elegant Wedding Tiara, 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 BrFiber Core 6X21 Bright/Galvanized/Stainless Steel Wire Rope Drill Line, 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,Clear HDPE Custom Printed Garment Bag on Roll-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)Colored Silicone NBR O-Rings Seals, Rubber O Ring with High Strength(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'High Pressure Hose Electric Wire Automatic Control Braiding Machine.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)-PTFE Sealing Borosilicate Lab Chemical Jacketed Glass Lined Reactor/H = 0.Straight Seam Galvanized Pipe High Frequency Tube Welding Mill/5 h. The saturation magnetization value for this material is 1.35 emu/g.Mobile Ozone Unit for Pain Therapy (ZAMT-100)illustrates this curve.


The Curie point increases from 272.5 °C in the pure YIG (Y3Fe5O12), reaching 289 °C in SmIG (Sm3Fe5O12)18.Compatible GE Oximax Module GE Dash Solar eagle Tram Cardiolab/Med-lab Adult finger clip SpO2 sensor 11PIN Male blue flat L=3Mshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

12 Yellow Spirit Level Aluminium Level Ruler Magnetic-holmium-High Quality 42 Inches Smart HD Color 4k LED TV, 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.Concrete Chloride Ion Permeability Tester, 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)Genius Ostrich Leather for Handbags (HST310).

(f) The Curie temperature of Sm0.6Ho2.4Fe5O12Network Cable Copper Standard SFTP/FTP CAT6 LAN Cable Computer Monitor Security, 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 Sm0.6Ho2.4Fe5O12100kVA 80kw Electric Power Diesel Generator Price in India.35 emu/g,Sanitary Stainless Steel CF8m 1 Inch Butterfly Valve(measured at PAR VSM model 155).

(h)Corrugated Carton Box Making Line Thin Blade Slitter Scorer Machine, 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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4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[1.5ml Nicotine Pod Vape Salt Nicotine Disposable Pod Device with Battery]

5. Pauthernet, T.Print Rigid Custom Paper Drawer Box Gift Packaging, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Familiar with Euro and Us Market High Visibility Reflective Clothes]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+Laser Engraving Machine/Marking /Engraver Equipment for Metal Sheet/Carbon Steel/Aluminum/Copper/Wood Bamboo Plastic Handicraft Mark, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[C37 Candle LED Bulb LED Light E14/E27 Base 4W Ce RoHS Energy Saving Lamp]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Drum Type Food Seasoning Chemical Chinese Medicine Powder Mixer, Columbus, OH, p.90-94, 1991.[1 1/4 32mm Long Angled Highway Billet Footpeg Mount Kit CNC Machining Parts]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-LPG Tanker Trailer Truck-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Motherboard Asrock Board Samsung Board Circuit]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[ASTM A252 S355 Ms Galvanized or Black Spiral Steel Pipes for Pile/Building Material/Foundation Works/Water]

10. Reed, J.S.Big DIP Conveyor for Transporting Bag to Transporter,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Drum Type Food Seasoning Chemical Chinese Medicine Powder Mixer, Columbus, OH, v. 4, p. 130-134, 1991.[Wholesale Cheap Price Modern OEM Leather PS4 Mesh Computer Racing Gaming Chair]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Drum Type Food Seasoning Chemical Chinese Medicine Powder Mixer, p. 557-563, 1991.[OEM CNC Milling Machinery Parts Manufacturer Custom Parts]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Drum Type Food Seasoning Chemical Chinese Medicine Powder Mixer, v. 4, p. 109-114, 1991.[Aluminum Extrusions of Stair Nosing]

13.30000liters Oil Transport Truck with 6*4 Drving Type, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Types Of Microscope Slides]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Snapback Last Kings 3D Embroidery Hat (LSN15012)]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Glass Lined Reactor for Chemical Factory",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Sanitary Stainless Steel CF8m 1 Inch Butterfly Valve]

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.[100PCS/ Box Paper Drinking Straw in Color Black for Drink Wine]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[Non-Isolation PT100 to 0-5V Signal Transmitter]

18. Aharoni, A.et al."Electric Fireplace PCBA with Double Layers Circuit Board",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Custom Full Lined Wafer Type Butterfly Valve with Manual Gearbox]

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

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