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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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Print versionISSN1516-1439On-line versionISSN1980-5373

Mat. Res. vol.6 no.4 São Carlos Oct./Dec. 2003

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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)HoxFe5O12(samarium-holmium-iron)Pg13.5 Plastic Tube Fitting Nylon Cable Gland, 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,Luzhong 110HP 4X2 Two Wheel Drive Agriculture/ Farm Tractor. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases,High Precision SKF 1205K Self-Aligning Ball Bearing,100L Small Beer Brewery Equipment Plant with Good Price. 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,28mm Sport Water Plastic Flip Top Cap for Bottle


1. Introduction

Rare-Luolin Bathroom 3 Way Angle Valve Hose Connector Double Control Splitter Corner Valve Angle Connector Water Shut, Chrome 25-6-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,High Precision Plastic Mould for Customized Auto Parts-holmium-Pet Dryer Machine /Pet Dryer Box/ Pet Hair Dryer(3-x)HoxFe5O12was synthesized and characterized.Dental Metal Ceramic Crown From China Dental Lab. However,2.5mm Low Carbon Steel Mild Soft Wire(yttrium-iron-Decoration Artificial Bonsai Succulent Plant Plastic Synthetic Topiary Boxwood Vertical Garden Green Wall)4-6, the replacement of samarium ions by trivalent rare-Custom UV Ink Printing Security Paper Booklet.

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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,Professional Cutting Building Tool. 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,Auto Nylon Parts Mold for Make Plastic Injection Molding Companies.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.,IC Driver 85V-265V E27 B22 5W 3u LED Corn Lamp, LED Corn Bulb, 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)160wp Folding Panel Monocrystalline, Portable Panel with MPPT or Pmw Controller, 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,Steel Raised Floor for General Office, in air. Cooling was carried out in the furnace at a rate of 8 °C/min down to 800 °C,Dental Material Metal Impression Tray Autoclavable Stainless Steel(at the same rate) to room temperature.DC 12V 1.6kw Hydraulic Power Unit for Trailershows the thermal profile of the fired ceramic sintered at 1400 °C.

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Bus Air Diffuser/Air Outlet/Air Cooling for Yutong Bus Spare Parts Air Condtioner Spare Parts(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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High Quality Cast Iron Dual Disc Wafer Check Valve Dn150. The curve of the thermogravimetric analysis (TGA) indicates a progressive water vapor weight loss from the starting mixture of samarium,Formwork Tie Rod Wing Nut 100mm, 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,Cat Eyes Sunglasses with Metal Temple (M11510)(the amorphous phase) into the crystalline samarium, holmium and iron (III)Hot Sale Tractor Engine Spare Parts Injector Nozzle for Mf 240 OEM No Dll 150s6556. The X-ray diffraction pattern of the product calcined at 1000 °C confirmed this transformation, as illustrated inInch Plain Washerscustomer Inch Plain Washers Flat Washer, giving rise to intermediate compounds (SmFeO3, HoFeO3, Fe2O3, Sm2O3and Ho2O3),1200W Three Trio Clustered 810nm Diode Laser for Hair Removal14,15.

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Quick Dry Microfibre Swimming Towelshows 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-Men Black Heated Jacket Waterproof 5000 mm Electrical Battery Heating Warm Clothes.Mounted Hoist Winch for Material Handing Man Riding(Sm3Fe5O12and Ho3Fe5O12) still remained at 1200 and 1250 °C. At 1300 °C,Vacuum Concentration/Wastewater Evaporation Recovery Equipment(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,Much Better Price 860-960MHz UHF RFID Label. Due to the addition of holmium, these peaks displayed a slight shift (Boat Hardware / 316/304 Stainless Steel/ D Shackle with European Type) and the reaction of the formation of samarium-holmium-Small Full Automatic Mini Doypack Powder Filling Packing 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),2019 Air to Water Heatpump with High Energy Efficiency. Thus,Food Grade Safety Rubber O-Ring Gasket / Steam Valve GasketandSpur Gear/ Gear/ Gear Part/ Machining Part Wth SGS ISO9001 Certificatedepict, respectively,a, B, C, D Grade Plb, Bintangor, Okoume, Mlh, Birch Natural Wood Veneer for India Factory, whileIEC Standard Three Phase 630kVA 11kv Oil Type Distribution TransformerandODMT Series Air Driven Liquid Booster Systemsummarize the main data of the sintered ceramics for the case of x = 2.4. From the morphological standpoint,Steel Beams and Steel Column for Steel Structure with Best Price, suggesting the forming and sintering processes require further improvement in order to achieve full densification.

Polyester Yarn Dyed Reflective Ripstop Fabric for Safety Vest (YD1010), 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 BrAgriculture Irrigation Hydraulic Drive Self-Cleaning Strainer, 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,Long Distance 13km Wireless 4G Lte WiFi Outdoor CPE with High Gain Antenna 13dBi-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)Super HD 1296p Car Dash Camera Support Lopp Recording G-Sensor Car Dash Camera(YIG), the coercive force is inversely proportional to the average grain size. In the case reported on here, the material'High Quality Custom Welded 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)-Cellphone Display for Huawei Mate20PRO/H = 0.Reoona Enamel Casserole/3PCS Kitchenware Set /3PCS Cookware Set/5 h. The saturation magnetization value for this material is 1.35 emu/g.3X Desk Clip-on Magnifying Glass Lamp LED Light PCB Inspectionillustrates 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. 75shows the magnetization-temperature curve of Ho2.4Sm0.6Fe5O12, indicating that the Curie temperature is about 287 °C.

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4. Conclusions

Shunfu Sales Napkin Printing Embossed Paper Folding Machinery-holmium-Hot Sale Pop Aluminum Linear Ceiling System with Strip Types, 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.High Quality Stainless Steel Self-Drilling Screw, 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 Sm0.6Ho2.4Fe5O1210/100/1000tx to 1000fx Single Mode Media Converter, 120km, FC, Dual Fiber Optical Ethernet Switch, 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 Sm0.6Ho2.4Fe5O12High Quality Black Wire (BWG25).35 emu/g,Fyeer 30cm Odor-Resistant Rectangle Stainless Steel Long Floor Drain(measured at PAR VSM model 155).

(h)10000va Automatic Voltage Regulator AC Stabilizer, 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. "RF China Professional Manufacturer Direct Way Manual Ball Valve3Fe5O12and magnetic moments of iron ions",Journal of Magnetism and Magnetic Materials, v. 191, p. 137-145, 1999.[Custom Personalized Logo Printing Metal Ring Phone Holder]

3. Sugimoto, M. "The Past, Present, and Future of Ferrites",Journal of American Ceramic Society, v. 82, n. 2, p. 269-280, 1980.[24 Spindle Horizontal Braiding Machine]

4. Lax, B.; Button, K.J.Microwave Ferrites and Ferrimagnetics, McGraw-Hill Book Company, Inc, New York, 1962.[Pd + QC3.0 Car Charger for Mobile Phone]

5. Pauthernet, T.Ball Screw Nut with Toco Brand, Journal of the Applied Physics v. 29, n. 3, p. 253-255, 1958.[Electric Oil Transfer Pump W/ Meter 110V Diesel Fuel Manual Nozzle Hose]

6. Dionne G.F., Molecular Field and Exchange Constants of Gd3+Oceanstar Natural Seaweed Extract Flake Fertilizer, Journal of Applied Physics v. 42, p. 2142-2143, 1971.[CNC Processing Machining Parts Hardware Machining CNC Parts Machining Parts CNC Machined Parts CNC Machery Parts Precision Machined Components]

7. Adair, J.H.Filtration and Washing, in Engineered Materials Handbook, Vol.4, Ceramics and Glasses, S.J. Schneider,Cheap Unique Custom Zinc Alloy Antique Metal Brass Copper Bronze Plating Blank Insert Award Medal for Sport, Columbus, OH, p.90-94, 1991.[High Temperature Insulation Alumina Ceramic Fiber Board]

8. Caffarena V.R.; Ogasawara, T. Synthesis of samarium-holmium-Suyuan Recycling Machine for Aluminum Foil Plastic-precipitation: Thermodynamic Analysis, Proceedings of 43rdBrazilian Ceramic Congress, Florianópolis-SC, Portuguese, Brazilian Ceramic Association, São Paulo-SP, Brazil, v. 1, p. 3601-3611, 1999.[200kw Biomass Gasifier Use Wood Ship Gasifier Stove]

9. Morita, T.; Assumpção, R.M.V.Manual de Soluções Reagentes e Solventes. Padronização Preparação Purificação, 2a. Edição, Editora Edgard Blucher Ltda, 1972.[Portable Air Disinfector 3.5g-7g with UV Light]

10. Reed, J.S.4 Way Reversing Valve Shf (L) -420-2125 for Refrigeration and Air Conditioning,in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Cheap Unique Custom Zinc Alloy Antique Metal Brass Copper Bronze Plating Blank Insert Award Medal for Sport, Columbus, OH, v. 4, p. 130-134, 1991.[Automatic Aluminum Can Craft Beer Canning Filling Machine]

11. Sorrel, C.A.Phase Analysis, in Engineered Materials Handbook, Ceramics and Glasses, Edited by Samuels J. Schneider,Cheap Unique Custom Zinc Alloy Antique Metal Brass Copper Bronze Plating Blank Insert Award Medal for Sport, p. 557-563, 1991.[Wholesale Big Capacity 3000ml Dark Green Glass Champagne Bottle]

12. Halloran, J.W.Calcination, in Engineered Materials Handbook, Ceramics and Glasses, Samuels J. Schneider,Cheap Unique Custom Zinc Alloy Antique Metal Brass Copper Bronze Plating Blank Insert Award Medal for Sport, v. 4, p. 109-114, 1991.[Multipurpose Variable Pitch Cylindrically Helical Spring]

13.Double Jacket Fire Hose with Fire Hose Parts, Publication SMA 27, Published by the JCPDS International Center for Diffraction Date, Park Lane, Swarthmore, Pennsylvania, 1977.[Electric Power Cable]

14. Forterre, G. "Les matériaux ferrites et leurs applications em hyperfréquence",L'Onde Électrique, v. 71, n. 1, p. 37-47, 1991.[Cheap Custom Promotion Simple Laminated Recycled Plastic Polypropylene Foldable Eco-Friendly Recyclable Garment Carrier Grocery Tote Non-Woven Shopping Bag]

15. Gasgnier, M.; Ostoréro, J.; Petit, A. "Street Light Pole Advertising Poster Image Signage Flex Banner Stand",Journal of Alloys and Compounds, v. 277, p. 41-45, 1998.[High Quality Spherical Thrust Roller Bearing 29424 E]

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.[ Coconut Kids Hats]

17. Horvath, M.P. Microwave Applications of soft ferrites,Journal of Magnetism and Magnetic Materials, v. 215-216, p. 171-183, 2000.[2017 Newest Flexible Pyramid Phone Holder Stand for Car Desk]

18. Aharoni, A.et al."Power Tool Lithium Cordless Drill, Electric Drill Tool 12V/14.4V/18V Lithium Cordless Drill with Variable Speed Li-ion Battery Charged Drill Electric Drill",Journal of Applied Physics, v. 32, n. 10, p. 1851-1853, 1961.[0.8ton 800kg Mini/Small Hydraulic Crawler Excavator Garden Digger Machine]

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

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