1：Experimental Design and Method Selection

The study involved measuring the capacitance of different pyroelectric crystals of varying sizes and calculating their permittivities. A vacuum setup was used to correlate these measurements with the maximum X-ray energies at variable pressures.

2：Sample Selection and Data Sources

Different sizes of LiTaO3 and LiNbO3 crystals (3?3?6 mm, 5?5?6 mm, 7?7?6 mm, and 9?9?6 mm) were used for capacitance measurements in the direction of polarization and perpendicular to it.

3：List of Experimental Equipment and Materials

LCR-meter (Voltcraft LCR-300), energy-dispersive X-ray detector (Amptek X-123 SDD), adjustable vacuum chamber, copper foil (25 μm thickness), Kapton? foil (50 μm thickness).

4：Experimental Procedures and Operational Workflow

Capacitance measurements were executed at room temperature with a frequency of 10 kHz. X-ray intensities and energies were measured using the X-ray detector inside the vacuum chamber. Crystals were heated to 150 °C at a pressure of 2?10-3 mbar, and X-ray spectra were collected for 600 s during the cooling phase.

5：Data Analysis Methods

The capacitance and permittivity values were calculated from the measurements. The influence of crystal size and pressure on X-ray energies was analyzed.