Traditionally, C12A7 materials have been processed via solid-state reaction followed by pulsed laser deposition (PLD) or floating zone (Fz) crystallization methods at high temperature, high cost approaches to single-phase films. These techniques require a significant number of process steps to generate C12A7:e⁻ materials that have been shown to exhibit exceptional electrical conductivities as high as 1 S/cm. We demonstrate here an effective alternative method using flame made C12A7 nanopowders (NPs) produced via liquid-feed flame spray pyrolysis (LF-FSP). Nearly fully dense, single phase, and transparent C12A7 films (< 50 μm) can be produced by processing these NPs into green films by tape-casting, thermo-compression and then sintering to 1300 $℃$/3 h/O₂. Subsequent heat treatments in 20/80 H₂/N₂ replaces cage trapped O^2- ions forming C12A7:H⁻ followed by UV irradiation to generate C12A7:e⁻ with electrical conductivities of 35 mS cm^-1. C12A7:e- appears to belong to a new class of transparent conducting oxides (TCOs) that may offer commercial potential on further optimization due to low materials and processing costs, environmental stability, and natural abundance when processed efficiently.

传统上，C12A7材料是通过固态反应，然后在高温，高成本的单相膜方法中进行脉冲激光沉积（PLD）或浮区（Fz）结晶方法加工而成的。这些技术需要的处理步骤的显著号生成C12A7：电子^-已被证明表现出优异的电导率高达1 S / cm的材料。我们在这里展示了一种有效的替代方法，该方法使用通过液体进料火焰喷雾热解法（LF-FSP）生产的C12A7纳米纳米粉（NPs）制成的火焰。通过流延流延，热压然后烧结至1300°C将这些NP加工成绿色膜，可以生产出几乎完全致密，单相和透明的C12A7膜（<50μm）$℃$/ 3 h / O ₂。在20/80ħ随后的热处理₂ / N _2项内容替换捕获笼ø ^2-离子形成C12A7：H ^-随后通过UV照射，以生成C12A7：电子^-具有35毫秒厘米电导率^-1。C12A7：e-似乎属于一类新的透明导电氧化物（TCO），由于其材料和加工成本低，环境稳定性好且经有效加工后自然丰度高，因此可为进一步优化提供商业潜力。