High-pressure phase transition and unusual compressibility of apatite-type La10Si6O27

Pressure-induced structural evolution of apatite-type La 9.33 Si 6 O 26

“…Recently, we used in situ synchrotron x-ray diffraction (XRD) to investigate ATLS under high pressure to investigate the structural evolution and corresponding structural formation/alteration mechanism of ATLS under external forces. [28,29] We found that the flexibility of the apatite structure was mainly dominated by the isolated SiO 4 tetrahedra and that the compressibility was mainly dominated by the La-O polyhedral environment. [29] Moreover, we found that for the ATLS, similar to what happens in scheelite-type ABO 4 compounds, doping the Si sites with a larger cation (e.g., Mg 2+ ) increased the r SiO 4 /r La ratio, thus enhancing the P T and lowering the axial compressibility of the ATLS.…”

“…[28,29] We found that the flexibility of the apatite structure was mainly dominated by the isolated SiO 4 tetrahedra and that the compressibility was mainly dominated by the La-O polyhedral environment. [29] Moreover, we found that for the ATLS, similar to what happens in scheelite-type ABO 4 compounds, doping the Si sites with a larger cation (e.g., Mg 2+ ) increased the r SiO 4 /r La ratio, thus enhancing the P T and lowering the axial compressibility of the ATLS. [28] However, previous studies mainly focused on ATLS with interstitial oxygen atoms, so the detailed structural alteration mechanism of ATLS has not been rigorously determined because of the lack of comparative data to illuminate the effect of interstitial oxygen atoms on the structural evolution of ATLS under compression.…”

New approach to improve the conductivity of apatite-type lanthanum germanate La9.33Ge6O26 as electrolyte for IT-SOFCs

“…The investigations of apatite-type lanthanum silicates/germanates (ATLS/ATLG) as novel electrolyte materials for intermediate temperature solid oxide fuel cells (IT-SOFCs) have gained considerable interest owing to their clean energy conversion, high energy efficiency and potential use for developing fuel cell devices. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In contrast to a vacancy mechanism commonly observed for uoriteand perovskite-type oxide ion conductors, such as doped ZrO 2 (e.g. YSZ) 15,16 and doped LaGaO 3 (e.g.…”

A Comparative Cyclic Voltametric Study on Rare Earth (Eu, Sm, Dy, and Tb) Ions Doped La10Si6O27 Nanophosphors for Sensor Application

“…Of all the electrochemical techniques, voltammetry has been the most extensively used for quantification of drugs [16,17]. Applying these methods, several biosensors with nanomaterials have been used for the analysis of paracetamol samples [18,19]. In the present work, we report the synthesis of the rare earth Eu 3+ , Sm 3+ , Dy 3+ , and Tb 3+ ions-doped La 10 Si 6 O 27 nanophosphor via the solution combustion method.…”