Effects of excessive magnesium oxide and sintering regime on microstructure and dielectric properties of forsterite ceramics for millimeterwave dielectrics

2022 ◽  
Author(s):  
Guangming He ◽  
Zhijun Li ◽  
Yunan Dong ◽  
Guoshuai Wang
Keyword(s):  
Dielectric Properties ◽  
Magnesium Oxide

Dielectric properties of magnesium oxide at microwave frequency

2010 ◽  
Vol 504 (1) ◽  
pp. 284-287 ◽  
Author(s):  
Jhih-Yong Chen ◽  
Wei-Hung Hsu ◽  
Cheng-Liang Huang
Keyword(s):  
Dielectric Properties ◽  
Magnesium Oxide ◽  
Microwave Frequency

Effect of boron nitride nanosheets addition on the mechanical and dielectric properties of magnesium oxide ceramics

2020 ◽  
Vol 46 (15) ◽  
pp. 23669-23676
Author(s):  
Guandong Liang ◽  
Jianqiang Bi ◽  
Guoxun Sun ◽  
Weili Wang ◽  
Lu Wang
Keyword(s):  
Dielectric Properties ◽  
Boron Nitride ◽  
Magnesium Oxide ◽  
Oxide Ceramics ◽  
Boron Nitride Nanosheets

Surface Morphologies of PVDF-TrFE/MgO Nanocomposite Thin Films and its Effect on the Ferroelectric Properties

2015 ◽  
Vol 1134 ◽  
pp. 6-11 ◽  
Author(s):  
Mohamad Hafiz Mohd Wahid ◽  
Rozana Mohd Dahan ◽  
Siti Zaleha Sa'ad ◽  
Adillah Nurashikin Arshad ◽  
Muhamad Naiman Sarip ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Magnesium Oxide ◽  
Ferroelectric Properties ◽  
Filler Loading ◽  
Nanocomposite Thin Film ◽  
Nanocomposite Thin Films ◽  
Surface Morphologies

The enhancement of ferroelectric and dielectric properties of PVDF-TrFE by incorporating various percentages of Magnesium Oxide (1 – 7%) for spin coated nanocomposite thin film was demonstrated. Observations showed uniform distribution and low agglomeration of MgO in the PVDF-TrFE nanocomposite thin film, especially for 3% MgO. Additionally, the 3% MgO incorporated into PVDF-TrFE had generated the highest Pr (88 mC/m2) and dielectric constant (13.6) in comparison other percentage compositions. However, the addition of more than 3% MgO filler loading caused a reduction in the ferroelectric and dielectric properties of the nanocomposite thin films.

Influence of dip-coated MgO interphase on the mechanical and dielectric properties of 2D-SiCf/SiC composites

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39007-39014
Author(s):  
Yang Hu ◽  
Fa Luo ◽  
Shichang Duan ◽  
Wancheng Zhou ◽  
Dongmei Zhu
Keyword(s):  
Silicon Carbide ◽  
Dielectric Properties ◽  
Magnesium Oxide ◽  
Dip Coating ◽  
Coating Process ◽  
Silicon Carbide Fibers ◽  
Sic Composites

This work focused on the use of the dip-coating process to prepare magnesium oxide (MgO) coatings on silicon carbide fibers (SiCf) as an interfacial system for SiCf/SiC composites.

Observations of the Thermal Decomposition of Brucite

1968 ◽  
Vol 26 ◽  
pp. 446-447
Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck
Keyword(s):  
Thermal Decomposition ◽  
Magnesium Oxide ◽  
Basal Plane ◽  
Magnesium Ions ◽  
A Value ◽  
Reaction Proceeds

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.

Time-resolved high-resolution electron microscopy of structural stability in mgo clusters

1996 ◽  
Vol 54 ◽  
pp. 672-673
Author(s):  
T. Kizuka ◽  
N. Tanaka
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Magnesium Oxide ◽  
Structural Stability ◽  
High Resolution Electron Microscopy ◽  
Video Tape ◽  
Solid State Physics ◽  
Time Resolved ◽  
Resolution Electron ◽  
Structural And Functional Properties

Structure and stability of atomic clusters have been studied by time-resolved high-resolution electron microscopy (TRHREM). Typical examples are observations of structural fluctuation in gold (Au) clusters supported on silicon oxide films, graphtized carbon films and magnesium oxide (MgO) films. All the observations have been performed on the clusters consisted of single metal element. Structural stability of ceramics clusters, such as metal-oxide, metal-nitride and metal-carbide clusters, has not been observed by TRHREM although the clusters show anomalous structural and functional properties concerning to solid state physics and materials science.In the present study, the behavior of ceramic, magnesium oxide (MgO) clusters is for the first time observed by TRHREM at 1/60 s time resolution and at atomic resolution down to 0.2 nm.MgO and gold were subsequently deposited on sodium chloride (001) substrates. The specimens, single crystalline MgO films on which Au particles were dispersed were separated in distilled water and observed by using a 200-kV high-resolution electron microscope (JEOL, JEM2010) equipped with a high sensitive TV camera and a video tape recorder system.

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