LiNaK

LiNaK refers to a ternary alloy of lithium, sodium, and potassium, collectively known as alkali metals. In many contexts, LiNaK denotes a eutectic mixture whose melting point is significantly lower than that of the pure elements, producing a liquid metal at or near room temperature. The composition is chosen to maximize liquidity and heat-transfer performance, yielding a homogeneous liquid over a broad operating range.

The exact ratios in LiNaK can vary for different applications, but the goal is a low-melting, high-thermal-conductivity liquid. As with other alkali metal liquids, LiNaK is dense and has a high boiling point, which supports use as a heat-transfer fluid in high-temperature loops. The liquid’s viscosity is relatively low compared with many other fluids, contributing to favorable flow characteristics in piping and heat exchangers.

Handling and safety are central considerations. LiNaK is highly reactive with water and air, capable of rapid hydrogen generation, ignition, and vigorous reactions. It must be stored and used under inert atmosphere or sealed systems, with compatible materials and proper containment to prevent exposure to moisture or oxygen.

Applications and limitations. LiNaK is studied and used in niche contexts as a liquid metal coolant and heat-transfer fluid for experimental and research purposes, including certain solar thermal and nuclear-loop systems. Its attractive thermal properties are balanced by safety, corrosion, and materials compatibility concerns, which limit widespread adoption. Ongoing research focuses on improving containment, compatibility, and system design to harness its advantages while mitigating risks.