Preparation and Electrical Properties of La0.9Sr0.1TiO3+δ

Abstract

La1−xSrxTiO3+δ (LST) has been studied in many fields, especially in the field of microelectronics due to its excellent electrical performance. Our previous theoretical simulated work has suggested that LST has good dielectric properties, but there are rare reports about this, especially experimental reports. In this paper, LST was prepared using a solid-state reaction method. The X-rays diffraction (XRD), scanning electron microscope (SEM), broadband dielectric spectroscopy, impedance spectroscopy and photoconductive measurement were used to characterize the sample. The results show that the values of dielectric parameters (the relative dielectric constant εr and dielectric loss tanδ), dependent on temperature, are stable under 350 °C and the value of the relative dielectric constant and dielectric loss are about 52–88 and 6.5 × 10−3, respectively. Its value of conductivity increases with rise in temperature, which suggests its negative temperature coefficient of the resistance. In addition, the band gap of LST is about 3.39 eV, so it belongs to a kind of wide-band-gap semiconductor materials. All these indicate that LST has anti-interference ability and good dielectric properties. It could have potential applications as an electronic material.

Structural, Morphological and Dielectric Studies of Sol Gel Derived Gd Doped SrTiO3-δ

“…In spite of this, the ferroelectric domain walls contribute less at high temperature leading to rise in loss tangent factor. Similar dielectric behavior has been reported in the literature for similar category compounds [14,15,17,18]. The variation trends for the doped samples were approximately identical to that for undoped STO0.…”

“…The space charge polarization arising from the movement of ions and defects in the material may be responsible for this increase [13]. There is no curie peak detected in the whole measurement temperature range [14][15]. The high values of dielectric constant at room temperature for STO0 sample may be attributed to the presence of all kinds of polarizations at room temperature which can lead to irregular increase in the permittivities [16][17].…”

Solid electrolytes based on {1 − (x + y)}ZrO 2 -(x)MgO-(y)CaO ternary system: Preparation, characterization, ionic conductivity, and dielectric properties

“…However, with respect to frequency, dielectric constant shows a decrease in values as the frequency increases, due to lower polarization. In temperature range 300–550 °C, there is a sharp increase in the value of ε, which might be due to space charge polarization in the materials [39].

Fig. 7bDielectric constant at different frequencies as a function temperature for the 6Mg3Ca composition.

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Gadolinium and Thulium Doping to Perovskite Structured Strontium Titanates at Strontium and Titanium Sites

“…Figures 4 and 5 include the variation of loss tangent and conductivity, respectively, with frequency at temperature 400 o C. Loss tangent factor decreases with frequency whereas conductivity increases. The doped samples showed higher loss factor and conductivity values than the pure one [17][18][19][20][21][22] .…”

“…Fig. 3 includes the frequency variation of dielectric constant at temperature 400 o C for all the samples; clearly doped samples have higher values than the pure one [14][15][16][17] .…”