Synthesis Characterization and Microwave Dielectric
The ilmenite structure is an ordered derivative of the corundum structure. It is adopted by A 21 B 41 X 3 and A 1 B 51 X 3 compounds when A and B cations are similar in size and the A cation is much smaller than the X anion. 14 In the present paper we report the microwave dielectric properties of a new group of ATiO 3 (A 5 Co Mn Ni) ceramics
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Effect of Nonstoichiometry on the Structure and Microwave
Microwave dielectric properties of Ba 0.9925 (Mg 0.33 Ta 0.67)O 3 ε r = 24.7 τ f = 1.2 ppm/°C Q u xf = 152 580 GHz and Ba(Mg 0.3183 Ta 0.67)O 3 ε r = 25.1 τ f = 3.3 ppm/°C and Q u xf = 120 500 GHz were found to be better than stoichiometric BMT ε r = 24.2 τ f = 8 ppm/°C and Q u xf = 100 500 GHz . Raman spectroscopy was
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Microwave dielectric properties of Mg 4 Nb 2−x (Zr 1/2 W 1
Mar 20 2020 · A. Kan H. Ogawa Microwave Dielectric Properties of Corundum-Structured (Mg 4−x M x) (Nb 2−y A y)O 9 (M = Mn Co and Zn A = Ta and Sb) Ceramics. in 2007 Sixteenth IEEE international symposium on the applications of ferroelectrics IEEE (2007) pp. 519–522 8.
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Structure and Microwave Dielectric Property Relations in
Abstract. The effects of cobalt substitution for magnesium on the microstructure and microwave dielectric properties of Ba(Mg 1/3 Nb 2/3)O 3 are investigated using X-ray diffraction (XRD) scanning electron microscope (SEM) transmission electron microscopy (TEM) Raman spectra and microwave dielectric properties measurement. The structure of NbO 6 octahedra displays a significant effect
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Microwave dielectric properties and cation distribution of
Sep 03 2018 · Among such microwave dielectric ceramics the spinel-structured MgAl 2 O 4 ceramics are reported to possess a relatively low ε r of 8.8 and a Q f of 69 800 GHz. 1) The MgAl 2 O 4 ceramics have an intermediate spinel structure with (No. 227) space group in which Mg 2 and Al 3 cations occupy both the tetrahedral and octahedral sites.
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Study on microwave dielectric properties of corundum type
Jun 13 2017 · This paper reports the study of structural morphological and microwave dielectric properties of Co3O4 added corundum type Mg4Nb2O9 ceramics sintered at 1200–1300 °C. The samples were prepared by solid state reaction method. X-ray diffraction patterns of these samples confirm the phase (Mg1−x Cox)4Nb2O9 along with a small percentage of secondary phase Mg4Nb2O9.
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J. Am. Ceram. Soc. DOI 10.1111/jace.13347 Journal 2014
The crystal structure microstructure and microwave dielectric properties of forsterite-based (Mg 1–xNi x) 2SiO 4 (x = 0.02–0.20) ceramics were systematically investigated. All samples present a single forsterite phase of an orthorhombic structure with a space group Pbnm except for a little MgSiO 3 secondary phase as x > 0.08.
Get PriceRelationship between bond strength and microwave
Request PDF On Jan 1 2004 A. Kan and others published Relationship between bond strength and microwave dielectric properties of corundom type (Mg 4xCo x)Nb 2O 9 and Mg 4(Nb 2
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Effects of sintering temperature and Ca substitution on
Apr 30 2015 · Effects of Ca substitution for Mg on the phase composition microstructure sintering behavior and microwave dielectric properties of Mg3−xCaxV2O8 ceramics were investigated. Mg3−xCaxV2O8 ceramics could be well densified at around 950 °C using a solid-state reaction method. The crystal structure and microwave dielectric properties exhibited strong dependence on the
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Crystal Structure of Corundum Type Mg4(Nb2−xTax)O9
Mg 4 Nb 2 O 9 (MN) ceramics with a corundum-type structure possesses good microwave dielectric properties (e r = 12.6 Q 9 f = 197 000 GHz s f = -77 ppm/°C) at relatively high temperatures (1350
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Crystal structural refinement of corundum-structured
Jan 01 2007 · The microwave dielectric properties and crystal structure of corundum-structured Mg 4 Nb 2 O 9 (MN) Co 4 Nb 2 O 9 (CN) and Mg 4 Ta 2 O 9 (MT) compounds were investigated in this study.
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Influence of Zn substitution for Mg on microwave
The microwave dielectric properties and crystal structure of spinel-structured (1x)MgGa 2 O 4 -xZnGa 2 O 4 ceramics were characterized in this study. From the linear variation in the lattice parameters the formation of solid solution was obtained over the whole composition range. On the basis of the refined atomic coordinates the variations in the volume of tetrahedron and octahedron were
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Microwave dielectric properties and cation distribution of
Sep 03 2018 · Among such microwave dielectric ceramics the spinel-structured MgAl 2 O 4 ceramics are reported to possess a relatively low ε r of 8.8 and a Q f of 69 800 GHz. 1) The MgAl 2 O 4 ceramics have an intermediate spinel structure with (No. 227) space group in which Mg 2 and Al 3 cations occupy both the tetrahedral and octahedral sites.
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Tailoring the Microwave Dielectric Properties of MgNb2O6
Jul 10 2007 · The microwave dielectric properties of the samples were measured by the resonance method in the frequency range 4–6 GHz. The dielectric properties have been tailored by forming a solid solution between MgNb 2 O 6 and MgTa 2 O 6 and by the substitution of TiO 2 for Nb 2 O 5 in both MgNb 2 O 6 and Mg 4 Nb 2 O 9 ceramics.
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Characterization and Microwave Dielectric Properties of M2
The dielectric properties exhibited a significant dependence on the sintering condition composition and crystal structure of the ceramics. In particular the 2.5 wt CuO-doped NiNb2O6 ceramics
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Characterization and Microwave Dielectric Properties of M2
The dielectric properties exhibited a significant dependence on the sintering condition composition and crystal structure of the ceramics. In particular the 2.5 wt CuO-doped NiNb2O6 ceramics
Get PriceLow‐Loss Microwave Dielectrics Using Mg2(Ti1−xSnx)O4 (x=0
Sep 25 2009 · A fine combination of microwave dielectric properties (ɛr∼15.57 Q f∼318 000 GHz at 10.8 GHz τf∼−45.1 ppm/°C) was achieved for Mg2(Ti0.95Sn0.05)O4 ceramics sintered at 1390°C for 4 h. Ilmenite‐structured Mg (Ti0.95Sn0.05)O3 (ɛr∼16.67 Q f∼275 000 GHz at 10.3 GHz τf∼−53.2 ppm/°C) was detected as a second phase.
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Parthasarathi MohantySolid State Physics Materials
This paper reports the study of structural morphological and microwave dielectric properties of Co_3 O_4 added corundum type Mg_4 Nb_2 O_9 ceramics sintered at ℃. The samples were prepared by solid state reaction method.
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Cation Distributions and Microwave Dielectric Properties
Abstract. The Mg 2 and Ga 3 cation distributions in the MgGa 2 O 4 lattice were characterized by the refinement of the crystal structure and the firing temperature dependence of microwave dielectric properties was described in this study. The crystal structure refinement of MgGa 2 O 4 ceramics fired at different temperatures indicated that the degree of inversion x which represents the Mg 2
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Improved Microwave Dielectric Properties and Applications of Mg4Nb2O9 and Zn3Nb2O8 Ceramic Materials The corundum-structured Mg4Nb2O9 has an excellent microwave dielectric properties but it also required a sintering temperature of as high as 1350–1400°C /10 h In this dissertation Fe2O3 was chosen as a sintering aid and was added to
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Microwave Dielectric Scientific
Journal of Biomimetics Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum
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Crystal Chemistry and Microwave Dielectric Properties of
The effect of Sb5 substitution on the crystal chemistry and dielectric properties of Ba3MNb2-xSbxO9 (M = Mg Zn Ni) was investigated using a combination of X-ray and neutron powder diffraction and dielectric property measurements at microwave frequencies. Rietveld refinements were carried out to characterize the crystal structures of Ba3ZnSb2O9 and Ba3MgSb2O9 which have a 6H−BaTiO3-type
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Structure-dependent microwave dielectric properties of (1
Structure and dielectric characterizations were performed on the (1-x)La(Mg 1/2 Ti 1/2)O 3-xLa 2/3 TiO 3 perovskite ceramics with the actual composition 0⩽x⩽0.52. The sequence of structure transformations was detected as x is increased P 21 /n(0⩽x <0.3
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Study on microwave dielectric properties of corundum type
Jun 13 2017 · This paper reports the study of structural morphological and microwave dielectric properties of Co3O4 added corundum type Mg4Nb2O9 ceramics sintered at 1200–1300 °C. The samples were prepared by solid state reaction method. X-ray diffraction patterns of these samples confirm the phase (Mg1−x Cox)4Nb2O9 along with a small percentage of secondary phase Mg4Nb2O9.
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Improved Microwave Dielectric Properties and Applications
Improved Microwave Dielectric Properties and Applications of Mg4Nb2O9 and Zn3Nb2O8 Ceramic Materials The corundum-structured Mg4Nb2O9 has an excellent microwave dielectric properties but it also required a sintering temperature of as high as 1350–1400°C /10 h In this dissertation Fe2O3 was chosen as a sintering aid and was added to
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