[21p-D903-1~16] 6.4 Thin films and New materials

2:30 PM - 2:45 PM JST(5:30 AM - 5:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[21p-D903-2] Humidity control of reversible change of solid-liquid form in NaBH₄ thin films

〇(M1)Takumi Sato¹, Kenichi Kaminaga¹, Shingo Maruyama¹, Yuji Matsumoto¹ (1.Tohoku Univ.)

Keywords:

Borohydride,CW-IR laser deposition

Previous studies on borohydrides such as NaBH₄ have focused on thin-film preparation and growth orientation control using CW-IR laser deposition. However, these thin films have only been examined in inert gas atmospheres, and there has been a lack of morphological observations under atmospheric conditions. In this study, we discovered that the solid-liquid morphology of NaBH₄ thin films undergoes reversible crystallization and liquefaction depending on the moisture content in the atmosphere. Notably, the NaBH₄ thin film that crystallizes after undergoing liquefaction exhibits higher crystallinity compared to previous findings. The mechanism underlying this phenomenon will be discussed in the presentation.