Structural evolution and microwave dielectric properties of a novel Li3Mg2−x/3Nb1−2x/3TixO6 system with a rock salt structure

2018 ◽  
Vol 5 (12) ◽  
pp. 3113-3125 ◽  
Author(s):  
Xing Zhang ◽  
Bin Tang ◽  
Zixuan Fang ◽  
Hongyu Yang ◽  
Zhe Xiong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Solid Solutions ◽  
Rock Salt ◽  
Structural Evolution ◽  
Microwave Dielectric Properties ◽  
Rock Salt Structure ◽  
Microwave Dielectric ◽  
Salt Structure ◽  
Subcell Structure

Phase transition from an orthorhombic superstructure to a cubic subcell structure has splendid advantages in dielectric properties of Li2O–MgO–Nb2O5–TiO2 quaternary solid solutions.

scholarly journals Li4x/3Co2−2xTi1+2x/3O4 spinel solid solutions: order and disorder phase transition, cations distribution and adjustable microwave dielectric properties

RSC Advances ◽  
2017 ◽  
Vol 7 (81) ◽  
pp. 51670-51677 ◽  
Author(s):  
Xianghu Tan ◽  
Huanfu Zhou ◽  
Yuxin Tang ◽  
Di Zhou ◽  
Pushkar Kanhere ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Solid Solutions ◽  
Microwave Dielectric Properties ◽  
Disorder Phase Transition ◽  
Order And Disorder ◽  
Microwave Dielectric ◽  
Spinel Solid Solutions

A series of spinel solid solutions Li4x/3Co2−2xTi1+2x/3O4 (LCT, 0.2 ≤ x ≤ 0.8) were synthesized and their structures and microwave dielectric properties were characterized in detail.

HIGH THERMAL STABILITY OF MICROWAVE DIELECTRIC PROPERTIES OF CaTi1-x(Nb1/2Fe1/2)xO3 CERAMICS

2011 ◽  
Vol 01 (04) ◽  
pp. 417-427 ◽  
Author(s):  
A. D. S. BRUNO COSTA ◽  
M. C. ROMEU ◽  
R. C. S. COSTA ◽  
T. S. M. FERNANDES ◽  
F. W. DE O. AMARANTE ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Solid Solutions ◽  
Microwave Dielectric Properties ◽  
Titanium Content ◽  
Milling Process ◽  
Solid State Method ◽  
Small Shift ◽  
X Ray ◽  
Microwave Dielectric

This paper presents a study of the structure and microwave properties of [Formula: see text] substituted into the Ti 4+ site of calcium titanate ceramics. The structural and dielectric properties of solid solutions in CaTi 1-x( Nb 1/2 Fe 1/2)x O 3, was done. The microwave dielectric properties of solid solutions in CaTi 1-x( Nb 1/2 Fe 1/2)x O 3, (CNFTOX with x = 0.1 to x = 1) is discussed. The modified CaTiO3 (CTO) ceramics were prepared by a new procedure in the solid-state method. A study of the variations of the ball-milling process was done. The calcinations were done at 900°C for 3 and 5 h respectively, and the sintering at 1100°C, for 3 h. The structural property studies of the ceramics were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The X-ray analysis showed that all samples have an orthorhombic structure. The refinement analysis of all samples were also duly performed and discussed. The nine scattering bands centered at 183, 227, 247, 288, 338, 470, 490 and 805 cm-1 were observed. Several peaks presented a small shift as a function of the x value. All Raman spectra in the studied samples showed a small band at 805 cm-1, which is a function of the x value. The dielectric permittivity and loss at microwave frequencies (MW) were investigated. For both calcination treatments (900°C for 3 and 5 h), the dielectric permittivity decreased with a decrease of the titanium content. Dielectric permittivity values in the range of 20 to 80 were obtained. It was also observed that a higher number of balls in the milling process contribute to the increase of the εr values. The CNFTO has an excellent microwave property at x = 0.6, with a temperature coefficient of resonant frequency (τf) near zero (τf = 2.8 ppm/°C).

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