How is barium used in electronics and why is it critical for modern components?

How is barium used in electronics and why is it critical for modern components?
Barium plays an indispensable role in electronics through several compounds. Barium getters, typically barium-aluminum-nickel alloys, are evaporated inside vacuum tubes and cathode ray tubes to absorb residual gases, protecting oxide cathodes from degradation. This application extends to power tubes, oscillators, camera tubes, and solar collector tubes. More significantly, barium titanate is the foundational material for electronic ceramics, prized for its high dielectric constant, low dielectric loss, and ferroelectric, piezoelectric, and insulating properties. It is the base for positive temperature coefficient thermistors (PTC), multilayer ceramic capacitors (MLCCs), piezoelectric ceramics, sonar devices, and infrared detectors. The rapid growth of electric vehicles, 5G infrastructure, and consumer electronics is driving demand for MLCCs, which in turn supports barium titanate consumption. China's electronic-grade barium carbonate, used to synthesize barium titanate, is a high-value niche where domestic producers like Redstar are expanding, though they face competition from Japanese and Korean material suppliers who dominate the top end of the MLCC supply chain.