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<p>This study systematically investigated the effect of copper (Cu) substitution on the sintering behavior, crystal structure, microstructure, densification, and electrical properties of La<sub>0.5</sub>Ba<sub>0.5</sub>Co<sub>1-y</sub>Cu<sub>y</sub>O<sub>3</sub> (0.0 ≤ y ≤ 0.4, LBCCO) ceramics using the solid-state reaction method. Comprehensive characterization via heating microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and the DC two-probe method revealed that Cu substitution effectively lowers the densification temperature but concurrently reduces the electrical conductivity. Excessive doping (y &gt; 0.2) introduced a secondary La<sub>3</sub>Ba<sub>3</sub>Cu<sub>6</sub>O<sub>14</sub> phase. To evaluate their application potential, these compositions were formulated into thick-film resistor pastes with lead-borosilicate glass for low temperature co-fired ceramic (LTCC) technology. Analysis indicated that the thick-film sheet resistance was largely independent of Cu content, with La<sub>0.5</sub>Ba<sub>0.5</sub>CoO<sub>3</sub> and BaPO<sub>3</sub> identified as the primary phases. These results demonstrate the potential of the LBCCO system as a cost-effective alternative to precious ruthenium-based materials for LTCC resistor applications.</p>

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Investigation of Cu substituted La0.5Ba0.5CoO3 ceramics as conductive phase for LTCC thick film resistors

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Enxia Guo,
  • Jinyu Lv,
  • Bo Xu,
  • Bin Han,
  • Yanhang Wang,
  • Kun He,
  • Chengkui Zu

摘要

This study systematically investigated the effect of copper (Cu) substitution on the sintering behavior, crystal structure, microstructure, densification, and electrical properties of La0.5Ba0.5Co1-yCuyO3 (0.0 ≤ y ≤ 0.4, LBCCO) ceramics using the solid-state reaction method. Comprehensive characterization via heating microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and the DC two-probe method revealed that Cu substitution effectively lowers the densification temperature but concurrently reduces the electrical conductivity. Excessive doping (y > 0.2) introduced a secondary La3Ba3Cu6O14 phase. To evaluate their application potential, these compositions were formulated into thick-film resistor pastes with lead-borosilicate glass for low temperature co-fired ceramic (LTCC) technology. Analysis indicated that the thick-film sheet resistance was largely independent of Cu content, with La0.5Ba0.5CoO3 and BaPO3 identified as the primary phases. These results demonstrate the potential of the LBCCO system as a cost-effective alternative to precious ruthenium-based materials for LTCC resistor applications.