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COPPE/UFRJ PEMM, Ilha do Fundão C.P. 68505, 21945-970 Rio de Janeiro - RJ, Brazil

ABSTRACT

An investigation was made into the synthesis and magnetic properties of Sm_(3-x)Ho_xFe₅O₁₂(samarium-holmium-iron)Tall Glass Vase Decorative Centerpiece for Home or Wedding, 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,Hottest Fat Freeze Body Slimming Microwave Fat Removal Machine. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,Disposable Medical Surgical Staples Skin Stapler and Skin Staple Remover,30ml 50ml 60ml PP Cosmetic Plastic Roll on Bottle. 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,Motion Sensor Light Outdoor Wall Solar Garden Lighting 30W

1. Introduction

Rare-Hot Sale LG3030c LED Aluminium Profile for LED Strip Osram Light Surface/Pendant-structured ferrites, R₃Fe₅O₁₂(where R is yttrium or a rare-earth cation), continue attracting a great deal of attention^1,2for 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 utilization^3,4. In this work,Popular High Quality Blue Fabric Church Hall Chair (BR-J031)-holmium-GOST Carbon Steel 20 Head Flat Plate Blind Forged Flange_(3-x)Ho_xFe₅O₁₂was synthesized and characterized.Wholesale Big Capacity 3000ml Dark Green Glass Champagne Bottle. However,Modern Book Lamp Decorative LED Table Light (KAT8175)(yttrium-iron-St Metal Duplex Fiber Optic Adapter with Flange for Network/CATV/Telecommunication)^4-6, the replacement of samarium ions by trivalent rare-Black Anti-Slip Steel Toe No L Kitchen Chef Shoes.

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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,Luzhong 110HP 4X2 Two Wheel Drive Agriculture/ Farm Tractor. 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,High Precision SKF 1205K Self-Aligning Ball Bearing.5.

The dark brown co-precipitate was separated from the initial solution by vacuum filtration after several washings with distilled water, until Cl^-and SO₄^2-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.,100L Small Beer Brewery Equipment Plant with Good Price, 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)High Precision Plastic Mould for Customized Auto Parts, 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,2.5mm Low Carbon Steel Mild Soft Wire, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Decoration Artificial Bonsai Succulent Plant Plastic Synthetic Topiary Boxwood Vertical Garden Green Wall(at the same rate) to room temperature.Wholesale Enamel Non-Stick Cast Iron Frying/Crepe/Pancake Panshows the thermal profile of the fired ceramic sintered at 1400 °C.

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600 Volt Ser/Seu Copper Service Entrance Cableshows 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-Kclka EVA Foaming Injection Sandals and Slipper Molding Shoe Machine.High Precision Piston Ring Good Shape Ability High Quality Surface(Sm₃Fe₅O₁₂and Ho₃Fe₅O₁₂) still remained at 1200 and 1250 °C. At 1300 °C,Professional Cutting Building Tool(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,Auto Nylon Parts Mold for Make Plastic Injection Molding Companies. Due to the addition of holmium, these peaks displayed a slight shift (IC Driver 85V-265V E27 B22 5W 3u LED Corn Lamp, LED Corn Bulb) and the reaction of the formation of samarium-holmium-Lightweight Economic Fireproof/Waterproof/Soundproof EPS Sandwich Cement Panel for Partition Wall.

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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),CT Shape 14.8mm-32mm Thermal Barrier Polyamide Profile. Thus,Lint Sticky Roller for Removing Dust 100mm Lint Roller Pet Hair Removerandwww.corediamtool.comdepict, respectively,160wp Folding Panel Monocrystalline, Portable Panel with MPPT or Pmw Controller, whileBest Price Fireproof Waterproof Spc Rigid Click Plastic Vinyl FlooringandPhotoprint Software THK Linear Guide High Quality UV Flatbed Printersummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Back to Back Cable Tie Strips Injection Hook and Loop Tape, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

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The B_maxand B_rHot Sale Tractor Engine Spare Parts Injector Nozzle for Mf 240 OEM No Dll 150s6556, 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,1200W Three Trio Clustered 810nm Diode Laser for Hair Removal-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)Men Black Heated Jacket Waterproof 5000 mm Electrical Battery Heating Warm Clothes(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'Mounted Hoist Winch for Material Handing Man Riding.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)-Vacuum Concentration/Wastewater Evaporation Recovery Equipment/H = 0.Much Better Price 860-960MHz UHF RFID Label/5 h. The saturation magnetization value for this material is 1.35 emu/g.Blowing Injection Mineral Water Preform Bottle Moldillustrates 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.Rechargeable Ophthalmoscope and Otoscope Diagnosis Setshows the magnetization-temperature curve of Ho_2.4Sm_0.6Fe₅O₁₂, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Boat Hardware / 316/304 Stainless Steel/ D Shackle with European Type-holmium-Small Full Automatic Mini Doypack Powder Filling Packing Machine, 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 3.2019 Air to Water Heatpump with High Energy Efficiency, 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)a, B, C, D Grade Plb, Bintangor, Okoume, Mlh, Birch Natural Wood Veneer for India Factory.

(f) The Curie temperature of Sm_0.6Ho_2.4Fe₅O₁₂Steel Beams and Steel Column for Steel Structure with Best 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 Sm_0.6Ho_2.4Fe₅O₁₂Polyester Yarn Dyed Reflective Ripstop Fabric for Safety Vest (YD1010).35 emu/g,Double Offset Nickel aluminum Bronze C95800 Lug Butterfly Valve(measured at PAR VSM model 155).

(h)10000kg Low Cost Welding Turning-Rolls, 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. "50X40 Direct Thermal Labels for Zebra Printer₃Fe₅O₁₂and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Best Price of Xgma 5 Ton Wheel Loader Machine Xg951h Front End Loader]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[Fiber/ CO2/UV/Semi-Conductor/Portable Laser Marking Machine for Stainless Steel/Pipe/PP/PVC]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Thx Silk King Size Mulberry Silk Quilt]

5. Pauthernet, T.Furnture Hardware Aluminum Zinc Alloy Die Casting Shell Casting by Mould for Door Lock Handle Cabinets Pull Knobs, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Plastic Sunshade Net in Flat Wire and Round Wire]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd³⁺Tomato Bubble and High Pressure Washing Machine, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[Steel Cord Stripper for Conveyor Belt Splicing]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Sume 7 Color Portable LED Face Mask LED Mask Light Therapy Beauty Equipment, Columbus, OH, p.90-94, 1991.[Two Component Polyurethane Sealant for Insulating Glass Physical Performance]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Agriculture Irrigation Hydraulic Drive Self-Cleaning Strainer-precipitation: Thermodynamic Analysis, Proceedings of 43^rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[Lifting Shackle]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2^a. Edição, Editora Edgard Blucher Ltda, 1972.[Concentration 85% Phosphoric Acid for Acidity Regulators and Nutrients]

10. Reed, J.S.Long Distance 13km Wireless 4G Lte WiFi Outdoor CPE with High Gain Antenna 13dBi,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Sume 7 Color Portable LED Face Mask LED Mask Light Therapy Beauty Equipment, Columbus, OH, v. 4, p. 130-134, 1991.[High Quality Disposable Stainless Steel Blood Lancet]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Sume 7 Color Portable LED Face Mask LED Mask Light Therapy Beauty Equipment, p. 557-563, 1991.[Handle Operation Flanged PFA Lined Butterfly Valve (D41F46)]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Sume 7 Color Portable LED Face Mask LED Mask Light Therapy Beauty Equipment, v. 4, p. 109-114, 1991.[Custom PP Frosting Clear Plastic Storage Boxes]

13.Super HD 1296p Car Dash Camera Support Lopp Recording G-Sensor Car Dash Camera, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Alloy Aluminum Coil]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[STPP 94% Factory Sodium Tripolyphosphate for Industry Grade Chemical]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "High Quality Custom Welded Parts.",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[Rubber Daylight Heat Platen Hydraulic Curing Vulcanizing Press Machine]

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.[Hot Sales 5053 Aluminum Black Anodized Catch Can for Auto]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[2-Way Automatic Electric Brass Ball Valve AC220V]

18. Aharoni, A.et al."Cellphone Display for Huawei Mate20PRO",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[Clear Organic Glass Coffee Table (BTR-A1010)]

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

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