1：Experimental Design and Method Selection:

The study used a traditional mixed-oxide route to prepare (0.94-x)NN-0.06BZ-xCZ solid solution ceramics, with phase structure and properties analyzed using various characterization techniques to explore AFE stability evolution.

2：94-x)NN-06BZ-xCZ solid solution ceramics, with phase structure and properties analyzed using various characterization techniques to explore AFE stability evolution. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Ceramic samples with x ranging from 0 to 0.03 were prepared using raw chemicals from Sinopharm Chemical Reagent Co., Ltd., calcined and sintered at specific temperatures.

3：03 were prepared using raw chemicals from Sinopharm Chemical Reagent Co., Ltd., calcined and sintered at specific temperatures. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included FE-SEM (JEOL JSM-6490LV), XRD (X'Pert-Pro MPD), Raman spectrometer (LabRam HR Evolution), LCR meter (Agilent E4980A), Berlincourt-meter (YE2703A), ferroelectric test system (Precision LC), and synchrotron XRD at SSRF beam line 14B1. Materials were Na2CO3, BaCO3, CaCO3, Nb2O5, ZrO2, polyvinyl alcohol, and silver paste.

4：Materials were Na2CO3, BaCO3, CaCO3, Nb2O5, ZrO2, polyvinyl alcohol, and silver paste. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Powder mixing, calcination, grinding, pressing into discs, sintering, polishing, electrode application, poling, and measurements of microstructure, phase structure, dielectric properties, polarization, strain, and in-situ XRD under electric fields.

5：Data Analysis Methods:

Rietveld refinement using GSAS software for XRD data, spectral deconvolution for Raman spectra, and analysis of dielectric, polarization, and strain data to determine phase transitions and stability.