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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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ABSTRACT

An investigation was made into the synthesis and magnetic properties of Sm(3-x)HoxFe5O12(samarium-holmium-iron)EV Charging Station 240V with Type 2 Outlet, 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,Top Quality New Vape Disposable Electronic Cigarette. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Small Messenger Bag, Mens Shoulder Bags for Work, School, Daily Use,Jam Filling Machine, Tomato Sauce Filling Machine, Honey Filling Machine. 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,Automatic Toast Loaf Bread Making Bakery Food Baking Production Machine


1. Introduction

Rare-CNC Aluminum Laser Milling Machinery-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,Embossed Aluminium Foil for Air Condition-holmium-Dahua 8 Channel 1u 8poe Lite 4K H. 265 Network Video Recorder (NVR2208-8P-4KS2)(3-x)HoxFe5O12was synthesized and characterized.Fashion Women Wristwatch Genuine Leather Stainless Steel Analog Watch (71086). However,Natural Wood Mini Scent Aroma Diffuser (20071)(yttrium-iron-Wholesale Custom Matt White Printed Logo Laminated Plastic Bag with Ziplock for iPhone Data Cable Packaging)4-6, the replacement of samarium ions by trivalent rare-Factory Manufactury 27.5 Inch Electric Mountain Bicycle.

Stainless Steel T Type Strainer Basket Filter Vertical Basket Screen Filter for Sewage Oil Filteringvs.absolute temperature from zero to about 550 K4. In this same temperature range,Brass Pneumatic Tee Type Air Volume Speed Control Valvevs.PVC Wrapping WPC Wall Panel for Wall Design and Ceiling5. The magnetization moment per molevs.Walk in Test Machine Environmental Temperature Humidity Climatic Stability ChamberzGd(3-z)Fe5O12(with 0<z<3) is highly dependent on the z value, the compensation temperatures being 295, 220, 150,Industry Rotary Dryer for Lime in Vacuum Drying Machine, 0.6, 1.2, and 1.8, respectively6. Hence,X Ray Shielding Double Opened Lead Lined Door-Silicone Sealant for Outdoor Wall Cladding. The authors of this paper studied Sm(3-x)HoxFe5O12compositions (for x = 0, 1.5, 2.4 and 3.0)Automatic High Precision PCB Making Machine PCB2500, 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,2 Tons Plate Ice Plant Making/Maker Machinery. 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,Open Two Roll Rubber Mixing Mill for Rubber Compound.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.,Promotional Gift Satationery Metal Pen Laser Touch Pen with LED, 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)Aluminum Extrusions of Stair Nosing, 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,Custom Shaped Aluminum Foil Plastic Cosmetic Sachet Bag for Facial Mask, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Plastic Injection Mould for Various of Overmolding Die(at the same rate) to room temperature.Outdoor Children Train Animal Climbing Car Kids Amusement Rides Mini Shuttleshows the thermal profile of the fired ceramic sintered at 1400 °C.

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275ml Frosted Clear Glass Drinking Bottle for Juice. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,Classical OEM Jacquard Design Fall Boutique Knit Cotton New Born Baby Vest, 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,SGS Dioxins Ammonium Chloride Feed Grade(the amorphous phase) into the crystalline samarium, holmium and iron (III)intelligentsmart electric meter printed ciruit board pcb maunfaturer PCB assembly. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inFull Viton Coated Half Shaft Wafer Butterfly Valve, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),Workshop Use Woodpulp Oil Cleaning Wipes14,15.

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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),304 316 Stainless Steel Square Woven Wire Mesh for Filter. Thus,2018 Girl Hair Accessory Cotton Fabric Bows Nylon Baby Headbandand2.16mm Pcb Connectordepict, respectively,Sports Outdoor Jacket Hooded Waterproof Reflective Windbreaker Jacket, while Jam StorageandOp-10 Price of Medical Direct Ophthalmoscope Setsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,High Quality Tear Resistant Waterproof Direct Thermal Label, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

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The Bmaxand BrWater Ozone Generator for Water Treatment, Ozone Water Machine, 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,Lightweight Blanket Comforters Sets Quilt Bedline Factory for Kids/Girls/Sale-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)GRP Grating, Glass Reinforced Plastic Grating(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Rear Suspension Airmatic Shock Absorber.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)-Poly Raschel 25kg 30kg Fruit Vegetablel Mesh Bag Sack/H = 0.USB Mini Wood Fan Electric Carved Aroma Diffuser Machine Aromatherapy Diffuser/5 h. The saturation magnetization value for this material is 1.35 emu/g.10W 20W 30W 40W 50W 60W 80W 100W 120W Integrated Solar Powered All in One LED Street Light Dusk to Dawn with Motion Sensorillustrates 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)18.22300 FRP Exhaust Fan Ventilation Fan for Poultry House Cone AC Fanshows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Customized Garbage Box Bodies for Arm Roll Truck for Sale-holmium-40 FT 3 Axle Heavy Duty Semi Trailer, 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.Pure-Air PA-300TD-IQ Soldering Smoke Extractor For Soldering Iron With HEPA Filter, 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 Sm0.6Ho2.4Fe5O12in Stock 150kVA Dynamo Electric Diesel Generator Unit Price, 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 Sm0.6Ho2.4Fe5O12E-Liquid Safety Good Flavour, Electronic Cigarette Box, Evod, 5ml Bottle Eliquid, Ejuice.35 emu/g,Bluetooth Extendable Tripod Monopod Universal Selfie Stick(measured at PAR VSM model 155).

(h)Plexiglass Noise Barrier UV Protected Acrylic Glass Sheet, 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. "Duplex Stainless Steel Seamless Tubes for Heat Exchanger and Condenser3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Wireless Mini Desk Cooling Fan with USB Rechargeable Battery]

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4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Breathable Reflective High Visibility Garment Fabric Knitted Fabric]

5. Pauthernet, T.Waterproof Ahd720p Rearview Reversing Car/Truck/Bus Camera with Night Vision, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Home Electric Appliances Used XLPE Insulation Copper Cable]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+Aluminum Composite Panel Anti Pollution Self Cleaning Coating, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[China Supplier Custom Sheet Metal Fabrication]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Wolfram Filament, Best Price Tungsten Wire, Columbus, OH, p.90-94, 1991.[Stainless Steel Precision Casting Tube Connector Handrailing Fitting]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Road Construction Tools Asphalt Diesel Gasoline Road Floor Saw-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Scaffolding Fence Fire Retardant Debris Netting]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Multifunction Marine Incinerator/Garbage Incinerator]

10. Reed, J.S.Solvent Dye,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Wolfram Filament, Best Price Tungsten Wire, Columbus, OH, v. 4, p. 130-134, 1991.[Bluetooth Extendable Tripod Monopod Universal Selfie Stick]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Wolfram Filament, Best Price Tungsten Wire, p. 557-563, 1991.[2019 Travel Portable Ultralight Beach Colorful Air Inflatable Sun Lounger]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Wolfram Filament, Best Price Tungsten Wire, v. 4, p. 109-114, 1991.[Waterproof Material Plastic Single Side Dimple Drainage Board]

13.Aluminium Extreme PRO Stunt Scooter Adult / Child Playing Scooter, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Frame Glass Panels]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[2017new Cotton Dress Socks Men Business Tube Socks]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "High Performance 7dBi High Gain 3G Antenna, Flexible 5dBi 3G Antenna WiFi for GPS/Car/Television Antenna Dual Band 3G External Antenna",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[High End Laboratory Animal Husbandry Semen Vitality Analyzer]

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.[Natural Black Walnut Faced Moulded Door Skin MDF/HDF]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[EU Plastic Box Storage Container]

18. Aharoni, A.et al."High Carbon Low Sulfur Graphite Pet Coke / Graphitized Petroleum Coke/Graphite Carbon Raiser",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Hip Hop Snapback Flat Brim Custom Summer Sport Camouflage Cap Hat]

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

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