研究目的
To investigate the effect of yttrium doping on the structure and electrical conductivity of potassium sodium niobate (KNN) thin films.
研究成果
Yttrium doping successfully incorporated into the KNN lattice without changing its phase formation, leading to dense and homogenous grain structures. The doping concentration influenced the electrical conductivity, with low concentrations resulting in semi-conductive behavior and high concentrations leading to insulating properties due to ionic compensation. The study provides insights into the structural and electrical modifications achievable through yttrium doping in KNN thin films.
研究不足
The study is limited to the effects of yttrium doping on KNN thin films and does not explore other dopants or materials. The electrical conductivity measurements were conducted at room temperature and a single frequency, which may not capture the full range of electrical behaviors under different conditions.
1：Experimental Design and Method Selection:
Sol-gel spin coating technique was used to fabricate KNN thin films with varying yttrium concentrations.
2：Sample Selection and Data Sources:
KNN thin films with yttrium concentrations of 0,
3：1, 3, 5, 7, and 9 mol % were prepared. List of Experimental Equipment and Materials:
Potassium acetate, sodium acetate, yttrium, 2-methyoxyethanol, niobium ethoxide, acetyalcetone, Si substrate, rapid thermal annealing furnace (RTP-1000D4, MTI), X-ray diffraction (XRD) (PANalytical X’Pert Pro), Field emission scanning electron microscopy (FESEM) (Hitachi 51400), Raman scattering spectrometer (UniRAM 3500), Precision LCR Meter (U1733P, Agilent).
4：Experimental Procedures and Operational Workflow:
The mixed solution was spun onto the Si substrate, pyrolyzed, and annealed. The thickness of the film was set at approximately 200 nm by repeating the coating or heat treatment cycle 5 times. Au films were deposited for conductivity measurement.
5：Data Analysis Methods:
XRD for phase evolution, FESEM for grain morphology, EDX for composition analysis, Raman spectroscopy for phonon vibration properties, and LCR meter for conductivity measurement.
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