Hydrothermal synthesis of lanthanum silicate nanopowder and film preparation by electrophoretic deposition method

Abstract

We synthesize a nanosized lanthanum silicate, La 9.33 Si 6 O 26 , by means of a hydrothermal method, and then investigate the crystal structure by the Rietveld analysis and the maximum-entropy method using a neutron Bragg profile. In addition, we study electrical conduction properties of the sintered pellet with conductivity measurements under O 2 oxidizing and Ar reducing conditions. From these results, it is indicated that the oxyapatite-type lanthanum silicate with oxide-ion conduction can be prepared at 180°C hydrothermally. By using the nanopowder, we prepare a film of the lanthanum silicate via the electrophoretic deposition. As a result, it is demonstrated that a deposited film can be made successfully in an I 2 -added acetone bath and the thickness obtained in an optimized condition is around 10¯m.

Lanthanum Silicate Nanomaterials Enhance Sheath Blight Resistance in Rice: Mechanisms of Action and Soil Health Evaluation

“…The surface charges of La 10 Si 6 O 27 NRs, La 10 Si 6 O 27 NPs, La(OH) 3 NRs, and La 2 O 3 NPs were 33.4, 24.8, −2.0, and 15.4 mV, respectively (Table S1). The X-ray diffraction (XRD) spectra of La 10 Si 6 O 27 NRs, La 10 Si 6 O 27 NPs, La(OH) 3 NRs, and La 2 O 3 NPs show the anticipated characteristic peaks (Figure S1E–H) and are consistent with the reported data. − X-ray photoelectron spectroscopy (XPS) results showed that the La:Si:O atomic ratio in La 10 Si 6 O 27 NRs was 1.00:0.59:2.68, which is consistent with the theoretical value (1.00:0.60:2.70) (Table S2). The deconvoluted La 3d 3/2 spectrum demonstrated that the percentage of La–O and La–Si was 58.91 and 41.18%, respectively; the deconvoluted O 1s spectrum indicated that the percentage of La–O, Si–O, and H 2 O was 59.55, 29.97, and 10.48%, respectively (Table S2; Figure S2A).…”

“…La 10 Si 6 O 27 NRs, La 10 Si 6 O 27 NPs, and La­(OH) 3 NRs were prepared according to Ma et al, Kitamura et al, and Zhang et al with minor modifications, respectively. The complete synthesis methods are provided in the Supporting Information (Experiment S1). − La 2 O 3 NPs were obtained from the US Research Nanomaterials. Transmission electron microscopy (TEM, JEM-2100, Hitachi, Japan) was used to observe the morphology and size of La based NMs.…”