Crystal structure, spectra analysis and dielectric characteristics of Ba4M28/3Ti18O54 (M= La, Pr, Nd, and Sm) microwave ceramics

2021 ◽  
Vol 47 (2) ◽  
pp. 1750-1757
Author(s):  
Geng Wang ◽  
Qiuyun Fu ◽  
Pengju Guo ◽  
Ming Hu ◽  
Huanhuan Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Microwave Ceramics ◽  
Spectra Analysis ◽  
Dielectric Characteristics

Crystal Structure, Dielectric Characteristics and Conduction Mechanism of a New Hybrid Material, Tetra(Phenylpiperazinium) Decachlorotriplumbate(II)

2017 ◽  
Vol 28 (6) ◽  
pp. 3159-3174 ◽  
Author(s):  
Maha Mathlouthi ◽  
Abdelhamid Chiheb Dhieb ◽  
Arto Valkonen ◽  
Mohamed Rzaigui ◽  
Wajda Smirani
Keyword(s):  
Crystal Structure ◽  
Hybrid Material ◽  
Conduction Mechanism ◽  
Dielectric Characteristics

Correlation between crystal structure and modified microwave dielectric characteristics of Cu2+ substituted Li3Mg2NbO6 ceramics

2019 ◽  
Vol 45 (8) ◽  
pp. 10170-10175 ◽  
Author(s):  
Gang Wang ◽  
Dainan Zhang ◽  
Fang Xu ◽  
Xin Huang ◽  
Yan Yang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dielectric Characteristics ◽  
Microwave Dielectric

Crystal structure and microwave dielectric properties of M(NbxTa1−x)2O6 solid solution (M = Mg or Zn)

1997 ◽  
Vol 12 (6) ◽  
pp. 1437-1440 ◽  
Author(s):  
Hyo-Jong Lee ◽  
Kug-Sun Hong ◽  
In-Tae Kim
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Microwave Dielectric Properties ◽  
Temperature Stability ◽  
Two Phase ◽  
Dielectric Characteristics ◽  
Microwave Dielectric ◽  
Morphotropic Phase Transition ◽  
Phase Mixture ◽  
Better Than

The microwave dielectric characteristics and crystal structure of the Zn(NbxTa1−x)2O6 and Mg(NbxTa1−x)2O6 systems have been investigated. It was found that both systems exhibited a morphotropic phase transition. Based on the results it was suggested that permittivity and temperature coefficient of resonant frequency depend more on crystal structure rather than on chemical composition. It was also suggested that a two-phase mixture is better than a solid solution for achieving both high quality factor and good temperature stability.

Processing and Characterization of (1-x)(Na1/2Bi1/2)TiO3 - xLa(Mg1/2Ti1/2)O3 Ceramics

2006 ◽  
Vol 514-516 ◽  
pp. 250-254 ◽  
Author(s):  
Andrei N. Salak ◽  
Nikolai P. Vyshatko ◽  
Andréi L. Kholkin ◽  
Victor M. Ferreira ◽  
Nikolay M. Olekhnovich ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Bismuth Titanate ◽  
Lead Free ◽  
Dielectric Characteristics ◽  
Compositional Evolution ◽  
Evolution Of Structure ◽  
Permittivity Maximum

Lead-free relaxor ceramics based on sodium-bismuth titanate, (1-x)(Na1/2Bi1/2)TiO3 - xLa(Mg1/2Ti1/2)O3 [(1-x)NBT-xLMT] (0≤x≤0.25), were prepared by both the conventional mixed oxide method and by the Pechini route, and their crystal structure and dielectric properties were investigated. All the compositions studied were found to possess a rhombohedrally distorted crystal lattice at room temperature. A distortion degree of the unit cell decreases and its volume increases with LMT content. The temperature of the dielectric permittivity maximum does not change with increasing substitution rate. As x is increased, the frequency-dependent dielectric peaks are flattened. The compositional evolution of structure and dielectric characteristics of the ceramics obtained are analysed and discussed in respect to size, charge and polarizability of the cations involved.

Synthesis, Crystal Structure and Photoluminescent Properties of a New Uranium-Containing Silicotungstate

2013 ◽  
Vol 750-752 ◽  
pp. 1840-1843
Author(s):  
Rong Xin Tan ◽  
Shu Xin Cui ◽  
Hui Wang ◽  
Ya Ping Jiang ◽  
Wen Zhi Song
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Infrared Spectra ◽  
Elemental Analysis ◽  
Sandwich Structure ◽  
Sodium Ions ◽  
Uranyl Compounds ◽  
Spectra Analysis ◽  
X Ray ◽  
Triclinic System

A new uranium-containing silicotungstate A-β-Na14[Na2(UO2)2(SiW9O34)2]·43H2O (1) was synthesized in an aqueous solution. The compound was characterized by elemental analysis and infrared spectra analysis. A single-crystal X-ray analysis was carried out on crystal (1) which crystallizes in triclinic system, space group p ī, with a = 13.386 Å, b = 13.506 Å, c = 16.183 Å, α = 85.337o, β = 73.608o γ = 64.833o and Z = 1. Polyanion (1) consists of two A-β-SiW9 units which sandwich two uranium and two sodium ions, leading to a Keggin-type sandwich structure. The photoluminescent spectrum of (1) shows typical emission features of uranyl compounds.

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