Abstract
This study processed and characterized the biphasic ceramics Na2Ti3O7/Na2Ti6O13 that were obtained from semi-crystalline nanoparticles synthesized using sonochemical methods. Structural characterization techniques, such as X-ray diffraction and Raman spectroscopy, were used to identify the crystalline phases present. The Rietveld refinement revealed, among other structural parameters, the presence of two crystalline phases in compositions of 55.90% and 44.10% for sodium hexatitanate and trititanate, respectively. Via Raman spectroscopy, the presence of the main vibrational modes that correspond to the phases present in biphasic ceramics was confirmed. Finally, by using complex impedance spectroscopy, a decrease in the electrical resistance of both the grain (106 Ω-104 Ω) and its boundary (108 Ω -105 Ω) under increasing temperature was identified.
Highlights
The main phases, trititanate and hexatitanate, (Na2Ti3O7 and Na2Ti6O13) of the sodium titanate family have been extensively studied in recent years due to their interesting physical and chemical properties[1,2]
Taking the issues previously stated into account, this study aimed, via sonochemistry, to synthesize biphasic ceramics of Na2Ti3O7 and Na2Ti6O13 with 50% phase composition and perform their electrical characterization
The NaTTs sample is composed of disodium phyllo-heptaoxotrititanate (Na2Ti3O7), which exhibits a monoclinic structure (P121/m1) with two formulas per unit cell (Z = 2) and relates to the inorganic crystal structure database (ICSD) card n°. 154637
Summary
The main phases, trititanate and hexatitanate, (Na2Ti3O7 and Na2Ti6O13) of the sodium titanate family have been extensively studied in recent years due to their interesting physical and chemical properties[1,2]. These phases present, as a fundamental structural characteristic, a monoclinic crystalline structure, there is a variation in the shape and position in which the Na+ ion appears with the oxygen. This leads to structural organization in the layers for Na2Ti3O7 and the tunnels for Na2Ti6O131,2. There is very little information in the literature from the point of view of their electrical properties and what occurs in sodium titanate ceramics that have phase mixtures
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