Work

Novel molten salt method for synthesizing high-quality La3Ni2O7 with enhanced crystallinity and layered structures

Year: 2025

Type: conference-paper

Abstract: This study introduces a pioneering molten salt method that utilizes Bi2O3 as flux to successfully synthesize high-quality layered nickelates, exemplified by La3Ni2O7. Compared to conventional solid-state reactions, this approach facilitates synthesis at a relatively low temperature of 1100°C, leading to significantly enhanced crystallinity and a well-ordered layered structure. X-ray Diffraction (XRD) analysis confirms the material possesses a bilayer perovskite structure with Amam space group symmetry, where the enhanced intensity of the (0010) peak indicates a substantial reduction in structural defects and stacking faults. Characterization by Scanning Electron Microscopy (SEM) and Energy-Dispersive x-ray Spectroscopy (EDS) reveals uniform grains exceeding 15 μm in size with a precise and homogeneous chemical stoichiometry. Moreover, electrical transport measurements show that the oxygen vacancy concentration is the key parameter for tailoring the physical properties of the material. Through high-pressure oxygen annealing, a characteristic charge or spin density wave transition can be clearly induced in the 150-200 K range. This method provides ideal samples for future studies and establishes a robust experimental platform for exploring the superconductivity in nickelate systems.

DOI: 10.1117/12.3085158

Authors: Yifan Lai, Jiang Zhang

Institution: South China University of Technology

Language: English

Topic: Magnetic and transport properties of perovskites and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Funders: South China University of Technology, State Key Laboratory of Luminescent Materials and Devices, Fundamental Research Funds for the Central Universities

Awards: G7342330068, G8232297231

OpenAlex ID: W4414358040