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<p>This study explores the analysis of the phase, microstructure, electromagnetic interference (EMI) shielding, and microwave absorption properties of the prepared sample of (1-y) [(0.94) BaTiO<sub>3</sub>-0.06(BaZrO<sub>3</sub>)]-y[Na<sub>2</sub>O] ceramics with y = 0, 0.02, 0.04, 0.06, synthesized by high energy planetary ball milling technique. The material was synthesized using solid-state reaction route, followed by calcinations at a temperature of 1100&#xa0;°C for 2&#xa0;h and the powder was uniaxially pressed into rectangular plates and circular pellets using a hydraulic press and sintered at 1300&#xa0;°C for 2&#xa0;h. XRD, Raman spectroscopy, and FESEM have been used to examine the structural, vibrational, and surface morphology of the ceramics respectively. The synthesized ceramics have shown pure perovskite rhombohedral phase with space group R3c and was well matched with the standard (JCPDS file number COD 47-901-4756. The crystallite size was calculated to be 10.5&#xa0;nm for y = 0 and was increased from 15.7&#xa0;nm to 19.6&#xa0;nm with increasing of Na<sup>+</sup> doing from y = 0.02 to y = 0.06. The FESEM micrographs reveal a well dense material with a little porosity with average grain sizes of 175&#xa0;nm, 389.4&#xa0;nm, 577.6&#xa0;nm, and 631.2&#xa0;nm for Na doped BZT ceramics with concentrations of y = 0.00, 0.02, 0.04, and 0.06. Vector Network Analyzer (VNA) measurements demonstrate that the sample with y = 0.02 exhibits the total shielding effectiveness (SE<sub>T</sub>) of 36.2 dB and a reflection loss of -89.1 dB at ∼13.5&#xa0;GHz with 1.5&#xa0;mm thickness sample. The value of ε′ was measured to be 44.6 at 15.9&#xa0;GHz for y = 0.02 ceramic. These results suggest that Na doped BZT possesses the potential to efficiently absorb up to 99.99% of electromagnetic interference (EMI) radiation and viable for electromagnetic shielding, IOT, Sensing, Stealth technology, Microwave imaging, 5G mobile applications in high-frequency domains.</p>

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Ku-band absorption dominated microwave application for sodium doped BZT ceramics

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Asutosh Acharya,
  • Dibyaranjan Das,
  • Sanjeet Kerai,
  • Siba Majhi,
  • Kajal Parashar,
  • SKS Parashar

摘要

This study explores the analysis of the phase, microstructure, electromagnetic interference (EMI) shielding, and microwave absorption properties of the prepared sample of (1-y) [(0.94) BaTiO3-0.06(BaZrO3)]-y[Na2O] ceramics with y = 0, 0.02, 0.04, 0.06, synthesized by high energy planetary ball milling technique. The material was synthesized using solid-state reaction route, followed by calcinations at a temperature of 1100 °C for 2 h and the powder was uniaxially pressed into rectangular plates and circular pellets using a hydraulic press and sintered at 1300 °C for 2 h. XRD, Raman spectroscopy, and FESEM have been used to examine the structural, vibrational, and surface morphology of the ceramics respectively. The synthesized ceramics have shown pure perovskite rhombohedral phase with space group R3c and was well matched with the standard (JCPDS file number COD 47-901-4756. The crystallite size was calculated to be 10.5 nm for y = 0 and was increased from 15.7 nm to 19.6 nm with increasing of Na+ doing from y = 0.02 to y = 0.06. The FESEM micrographs reveal a well dense material with a little porosity with average grain sizes of 175 nm, 389.4 nm, 577.6 nm, and 631.2 nm for Na doped BZT ceramics with concentrations of y = 0.00, 0.02, 0.04, and 0.06. Vector Network Analyzer (VNA) measurements demonstrate that the sample with y = 0.02 exhibits the total shielding effectiveness (SET) of 36.2 dB and a reflection loss of -89.1 dB at ∼13.5 GHz with 1.5 mm thickness sample. The value of ε′ was measured to be 44.6 at 15.9 GHz for y = 0.02 ceramic. These results suggest that Na doped BZT possesses the potential to efficiently absorb up to 99.99% of electromagnetic interference (EMI) radiation and viable for electromagnetic shielding, IOT, Sensing, Stealth technology, Microwave imaging, 5G mobile applications in high-frequency domains.