scholarly journals Multiferroic Properties of Nanopowder-Synthesized Ferroelectric-Ferromagnetic 0.6BaTiO3-0.4NiFe2O4Ceramic

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Xinye Xu ◽  
Zheng Wu ◽  
Yanmin Jia ◽  
Weijian Li ◽  
Yongsheng Liu ◽  
...  
Keyword(s):  
Relative Dielectric Constant ◽  
Composite Ceramic ◽  
Sintering Process ◽  
Frequency Range ◽  
Multiferroic Properties ◽  
Measured Frequency Range ◽  
Ceramic Sintering ◽  
Chemical Synthesis Route ◽  
Ferromagnetic Magnetization ◽  
Sol Precursor

Multiferroic 0.6BaTiO3-0.4NiFe2O4dense nanoceramic composites were synthesized via a powder-in-sol precursor hybrid chemical synthesis route and a ceramic sintering process. At the measured frequency range (1 kHz~1 MHz), the relative dielectric constant is 150~1670 and the dielectric loss is 0.05~0.70. The composite ceramic showed obvious coexistence of ferroelectric and ferromagnetic phases. With the increase of temperature, the saturation ferromagnetic magnetization decreases, while the ferroelectric polarization increases.

Correction to Hydrothermal-Assisted Cold Sintering Process: A New Guidance for Low Temperature Ceramic Sintering

2016 ◽  
Vol 8 (49) ◽  
pp. 34170-34170 ◽  
Author(s):  
Hanzheng Guo ◽  
Jing Guo ◽  
Amanda Baker ◽  
Clive A. Randall
Keyword(s):  
Low Temperature ◽  
Sintering Process ◽  
Ceramic Sintering

Influences of Sintering Process on the Microstructure and Mechanical Behavior of ZrO2 Nano-Composite Ceramic Tool and Die Material

2010 ◽  
Vol 154-155 ◽  
pp. 1356-1360 ◽  
Author(s):  
Ming Dong Yi ◽  
Chong Hai Xu ◽  
Jing Jie Zhang ◽  
Zhen Yu Jiang
Keyword(s):  
Mechanical Properties ◽  
Ceramic Material ◽  
Composite Ceramic ◽  
Sintering Process ◽  
Ceramic Tool ◽  
Nano Composite ◽  
Pure Zro2 ◽  
Die Materials ◽  
Die Material ◽  
Composite Ceramic Material

A new ZrO2 nano-composite ceramic tool and die material was prepared with vacuum hot pressing technique. The effects of sintering parameters on the nano-composite ceramic tool and die materials were studied. The results indicated that the mechanical properties of ZrO2 nano-composite ceramic tool and die material with the additions of TiB2 and Al2O3 are higher than that of the pure ZrO2 ceramic material. Sintering at 1100 for 120min could improve the density and mechanical properties of ZrO2 nano-composite ceramic material. The flexural strength, fracture toughness and hardness with the optimum sintering parameters can reach 878MPa, 9.54MPa•m1/2 and 13.48GPa, respectively, obviously higher than that with non-optimum sintering parameters.

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

scholarly journals Very Low Crosstalk Measurement of Substrate Integrated Coaxial Line (SICL)

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1174
Author(s):  
Lu ◽  
Yang ◽  
Yin ◽  
Zhao ◽  
Liu
Keyword(s):  
Coplanar Waveguide ◽  
Reference Value ◽  
Coaxial Line ◽  
Calculation Formula ◽  
Frequency Range ◽  
Practical Design ◽  
Measured Frequency Range ◽  
Coaxial Lines ◽  
First Time ◽  
Better Than

When designing a microwave circuit involving substrate integrated coaxial lines (SICLs), it is important to know what real crosstalk between SICLs is. A measured crosstalk will be a good reference value in a practical design. In addition, it is also needed to compare and check the crosstalk from the simulation and calculation formula with measured results. However, it is very difficult to measure the crosstalk between SICLs because it is theoretically very low. In this study, for the first time, the crosstalk characteristics of a SICL are evaluated through experimental design and measurements. By adjusting the layout of the structures and implementing controlled experiments, interference caused by the presence of leaks and radiation at the interface and structural transitions is effectively suppressed. The experimental results show that for two parallel SICLs with a length of 30 mm and an interval of 5 mm, the isolation is greater than 80 dB for the measured frequency range of 1–8 GHz, significantly better than the results of the grounded coplanar waveguide (GCPW).

Janus-like Fe3O4/PDA vesicles with broadening microwave absorption bandwidth

2018 ◽  
Vol 6 (29) ◽  
pp. 7790-7796 ◽  
Author(s):  
Xiaofeng Shi ◽  
Zhengwang Liu ◽  
Wenbin You ◽  
Xuebing Zhao ◽  
Renchao Che
Keyword(s):  
Microwave Absorption ◽  
Coupling Effect ◽  
Magnetic Coupling ◽  
Strong Absorption ◽  
Frequency Range ◽  
Absorption Intensity ◽  
Absorption Bandwidth ◽  
Measured Frequency ◽  
Measured Frequency Range ◽  
Pda Vesicles

Fe3O4/PDA vesicle Janus nanospheres were successfully synthesized, and they exhibited an ultra-wide effective band as wide as 11.6 GHz, covering 73% of the whole measured frequency range (2–18 GHz), and a strong absorption intensity as high as −50.0 dB due to the asymmetric polarization and magnetic coupling effect.

Hydrothermal-Assisted Cold Sintering Process: A New Guidance for Low-Temperature Ceramic Sintering

2016 ◽  
Vol 8 (32) ◽  
pp. 20909-20915 ◽  
Author(s):  
Hanzheng Guo ◽  
Jing Guo ◽  
Amanda Baker ◽  
Clive A. Randall
Keyword(s):  
Low Temperature ◽  
Sintering Process ◽  
Ceramic Sintering

Simulation of the Effect of Initial Grain Size of Matrix on Microstructure Evolution in Nano-Composite Ceramic Tool Material

2010 ◽  
Vol 431-432 ◽  
pp. 527-530
Author(s):  
Hong Mei Cheng ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Bin Zou ◽  
Y. Li
Keyword(s):  
Grain Size ◽  
Microstructure Evolution ◽  
Tool Material ◽  
Composite Ceramic ◽  
Ceramic Materials ◽  
Sintering Process ◽  
Initial Matrix ◽  
Two Phase ◽  
Nano Composite ◽  
Set Up

A new Monte Carlo Potts′ model for the sintering process of two-phase nano-composite ceramic materials with various grain size of initial matrix is set up. The grain growth process is successfully investigated assuming the green body is completely dense. The effect of the initial matrix grain size on microstructure evolution is observed and discussed quantitatively.

scholarly journals Registration of geomagnetic field variations with a magnetic modulating sensor

2020 ◽  
Author(s):  
О.Л. СОКОЛ-КУТЫЛОВСКИЙ ◽  
Д.С. ТЯГУНОВ
Keyword(s):  
Magnetic Induction ◽  
Geomagnetic Field ◽  
Electromagnetic Waves ◽  
Frequency Range ◽  
Geomagnetic Variations ◽  
Phase Variations ◽  
Measured Frequency Range ◽  
Amorphous Ferromagnetic Core ◽  
Synchronous Recording ◽  
Different Parts

Показана возможность применения магнитомодуляционных датчиков слабого магнитного поля с аморфным ферромагнитным сердечником, работающих в режиме автопараметрического усиления сигнала магнитной индукции, для измерения амплитуды и фазы вариаций геомагнитного поля в диапазоне частот 0,01–30 Гц. Разрешающая способность магнитомодуляционных датчиков с автопараметрическим усилением сигнала магнитной индукции в аморфном ферромагнитном сердечнике с компенсированной продольной магнитострикцией не превышает 1 пТл. Приведены примеры синхронной записи амплитуды трех составляющих вариаций геомагнитного поля на различных участках диапазона измеряемых частот, записанные во время слабой магнитной бури интенсивностью 5 баллов. Получаемая с помощью магнитомодуляционного датчика информация об амплитуде и фазе геомагнитных вариаций совместно с данными по амплитуде электрического поля электромагнитных волн может быть применена в геофизике в различных методах магнитотеллурического зондирования. The possibility of using magnetic modulating sensors of the weak magnetic field with amorphous ferromagnetic core operating in the mode of autoparametric signal gain of magnetic induction to measure the amplitude and phase variations of the geomagnetic field in the frequency range 0.01–30 Hz. Resolution of magnetomodulation sensors with autoparametric signal increase of magnetic induction in ferromagnetic amorphous core with offset longitudinal magnetostriction is not more than 1 pTl. Examples of synchronous recording of the amplitude of the three components of the variations of the geomagnetic field in different parts of the measured frequency range, recorded during a weak magnetic storm intensity of five points are given. Information obtained by magnetomodulation sensor about the amplitude and phase of geomagnetic variations, together with data on the amplitude of the electric field of electromagnetic waves can be applied in geophysics to the different methods of magnetotelluric sounding.

scholarly journals Fractal corrections of BaTiO3-ceramic sintering parameters

2014 ◽  
Vol 46 (2) ◽  
pp. 149-156 ◽  
Author(s):  
V.V. Mitic ◽  
Lj. Kocic ◽  
V. Paunovic ◽  
V. Pavlovic
Keyword(s):  
Viscous Flow ◽  
Fractal Geometry ◽  
Particle Dynamics ◽  
Quasi Equilibrium ◽  
Green Body ◽  
Sintering Process ◽  
Area Reduction ◽  
Ceramic Sintering ◽  
Angle Of View ◽  
Surface Area Reduction

Morphology of ceramics grains and pores as well as Brownian character of particle dynamics inside ceramics specimen contributes to better understanding of the sintering process. BaTiO3-ceramics, studied in this paper, has light fractal form and it is emanated in three aspects. First, the surface of grains, even in starting green body as well as distribution of grains shows fractal behavior. Second, existence of pores and their distribution follow the rules of fractal geometry. Third, movement of particles inside viscous flow underlies the rule of Brownian motion, which is essentially a fractal category. These three elements, each in its domain influence sintering dynamics, and can be described by dimensionless quantitative factors, ?s ?p and ?m, being normalized to the interval [0,1]. Following sintering process, the associate formulae of Frenkel, Scherer and Mackenzie-Shuttleworth are shown from the angle of view of ceramics fractal dimension changing that approaches to 3. Also, it is shown that the energy balance is not violated after applying fractal correction to quasi equilibrium of the energy emanating from surface area reduction ES and energy adopted by viscous flow Ef .

Microwave Sintering of Large Products

1996 ◽  
Vol 430 ◽  
Author(s):  
Tasaburo Saji
Keyword(s):  
Dielectric Loss ◽  
Wave Energy ◽  
Microwave Sintering ◽  
Processing System ◽  
Uniform Electric Field ◽  
Sintering Process ◽  
Gyrotron Oscillator ◽  
Microwave Ceramic ◽  
Fine Crystalline Structure ◽  
Ceramic Sintering

AbstractA practical microwave ceramic sintering technology has been developed. To achieve the highest merit from microwave sintering, susceptors were not used. In this paper, the ceramic sintering process using the 28GHz mm-wave energy generated by a Gyrotron oscillator is described. Large sized (Φ 200 × 200 ) and complex shaped material of Si3N4, A12O3, and ZrO2 were successfully and reproducibly sintered. The sintered bodies exhibited high density and fine crystalline structure. The processed materials were found to have exceptional strength and toughness.The critical processing technology developed dealt with the means by which uniform and defect free sintered bodies are obtained. The processing stressed the importance of achieving a uniform electric field within the applicator and to decrease the sintering dependence on the materials’ temperature based dielectric loss properties. With the use of innovative support and thermal insulation structures, the processing system allowed for very precise temperature controls.

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