Study of ion dynamics in lanthanum aluminate probed by conductivity spectroscopy

Abstract

Conductivity Spectra of LaAlO3.

Time–temperature superposition in the grain and grain boundary response regime of A2HoRuO6(A = Ba, Sr, Ca) double perovskite ceramics: a conductivity spectroscopic analysis

“…The figures show a near linear dependence of these parameters on each other with a slope of almost unity indicating a power law dependence of dc on H of the form 𝜎 𝑡 ∝ 𝜔 𝐻 𝑛 where n is the slope of the graph. This implies that the dc and ac conductivity are correlated in AHR [57].…”

Electrical Behavior of Lanthanum Aluminate (LAO) and Gadolinium Doped Ceria (GDG) Composite Electrolyte for Electrochemical Devices

“…Using Scherer's formula, the average crystallite size was calculated to be in the 40-50nm range [16]. The structure with a smaller particle size or a large grain boundary has more oxygen vacancies resulting in higher conductivity [13,19,38]. The Energy-Dispersive Spectroscopy (EDS) study, shown in Figure 4, shows all the atomic constituents and their atomic percentage.…”

“…In SOFCs, LaAlO 3 may be a good alternative perovskite candidate for the oxide ions conductor (electrolyte) [16][17][18]. However, in an oxidizing environment, pure LaAlO 3 has lower ionic conductivity and more flexible conduction behavior [19]. The ionic conductivity of electrolytes can be best used through composition change by choosing a suitable aliovalent dopant and its optimum concentration [20].…”

“…However, the interdiffusion of constituents at the boundaries can be a disadvantage of YSZ and doped ceria composites, resulting in a decrease in conductivity [21,34]. It has been discovered that an SDC-LSGM composite electrolyte with a weight ratio of 9:1 has a high oxide ion conductivity [19,36].…”

A benzoate coprecipitation route for synthesizing nanocrystalline GDC powder with lowered sintering temperature

“…Several factors such as the shape and density of grain boundaries, the structural disorders, and the presence of impurities in the electrolyte powders can affect the grain boundary resistance of the dense electrolyte pellets [14]. Moreover, the applied synthesis method, the processing conditions, and the dopant concentration and composition can change the properties of the sintered electrolytes and grain boundaries [15].…”