Dataset Information

Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties.

ABSTRACT: Crystal structure and properties of Sr₁₁Mo₄O₂₃ treated at 1100 and 1400 °C were studied via synchrotron X-ray powder diffraction and thermogravimetric analysis, coupled with mass spectrometry. Synchrotron studies reveal the crystallographic effect of the annealing temperature, showing that the lowest-temperature phase must be defined in a triclinic symmetry, in contrast to the cubic one obtained at 1400 °C. The mass spectrometry allowed the identification of the released compounds during the thermogravimetric analysis, thus unveiling the physicochemical behavior of the sample during the heating process. Furthermore, an aging analysis was made, confirming the superior stability of this sample when it is treated at 1400 °C. Finally, an optimized sintering procedure allowed us to obtain a superior density and hence the highest conductivity measured so far for this system.

SUBMITTER: Miranda CD

PROVIDER: S-EPMC8697546 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature

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Synthesis conditions impact on Sr11Mo4O23 electroceramic: crystal structure, stability and transport properties.

Miranda Carlos Darío CD Villarroel-Rocha Dimar D Sapag Karim K López Carlos Alberto CA Pedregosa José Carmelo JC Alonso José Antonio JA

RSC advances 20210413 23

Crystal structure and properties of Sr11Mo4O23 treated at 1100 and 1400 °C were studied via synchrotron X-ray powder diffraction and thermogravimetric analysis, coupled with mass spectrometry. Synchrotron studies reveal the crystallographic effect of the annealing temperature, showing that the lowest-temperature phase must be defined in a triclinic symmetry, in contrast to the cubic one obtained at 1400 °C. The mass spectrometry allowed the identification ...[more]

PMID: 35423940

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Project description:Dopants in gold nanoclusters have been proved to mediate the intrinsic electronic properties of homo-clusters. In this work, we report the precise synthesis of atomically precise Au8Ag3(PPh3)7Cl3 alloy nanoclusters with multiple Ag dopants for the first time. Their structure was resolved by single-crystal X-ray crystallography. Au8Ag3(PPh3)7Cl3 nanoclusters possessed a similar structure topology to the well-known Au11(PPh3)7Cl3 nanoclusters. It is observed that the three Ag atoms were fixed at the cluster surface and bound selectively with the chlorine ligands in a C3-axis manner. The alloy nanoclusters exhibited a closed-shell electronic structure (i.e., 8(Au 6s1) + 3(Ag 5s1) - 3(Cl) = 8e), as evidenced by electrospray ionization-mass spectrometry (ESI-MS). The photothermodynamic stability of alloy clusters was remarkably improved (e.g., full decomposition after 7 days under sunlight irradiation vs. 3 days for Au11(PPh3)7Cl3 clusters). DFT calculations indicated that the Ag dopants in a C3-axis manner could obviously delocalize the electrons of Au to the orbitals of P atoms and then mediate the electronic property of the clusters. Shrinkage of the HOMO-LUMO gap to 1.67 eV of Au8Ag3(PPh3)7Cl3 was observed as compared with that of homo-nanoclusters of Au11(PPh3)7Cl3 (2.06 eV). The electrochemical gap of Au8Ag3(PPh3)7Cl3 alloy nanoclusters was 1.272 V, which was higher than that of Au11(PPh3)7Cl3 nanoclusters, which indicated higher electrochemical stability, as evidenced by the differential pulse voltammetry (DPV) method. Au8Ag3(PPh3)7Cl3 clusters exhibited three specific photoluminescence peaks at 405, 434 and 454 nm. AuAg alloy clusters exhibited twofold greater activity than homo gold clusters in the photooxidation of benzylamine, which was mainly due to the unique electronic properties of the alloy clusters. Controllable heteroatom doping engineering is a powerful method to tune the electronic properties of clusters, and then improve their photothermodynamic and electrochemical stability simultaneously for potential photocatalytic applications.

Dataset Information

Synthesis conditions impact on Sr₁₁Mo₄O₂₃ electroceramic: crystal structure, stability and transport properties.

Publications

Synthesis conditions impact on Sr<sub>11</sub>Mo<sub>4</sub>O<sub>23</sub> electroceramic: crystal structure, stability and transport properties.

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