R3: High-pressure science and deep Earth's material

[R3P-14] Synthesis of nano-polycrystalline diamond (NPD) from stearic acid and characterization of its microtexture

*Hideaki Kawamura¹, Hiroaki Ohfuji² (1. Graduate School of Science and Engineering, Ehime University, 2. Geodynamics Research Center, Ehime University)

Keywords:Nano-Polycrystalline Diamond (NPD), High pressure, C-H-O fluid, TEM

We performed a series of high-pressure and high-temperature experiments using multi-anvil apparatus and found that yellowish NPD-like diamond was obtained from a decomposition product of stearic acid. Recovered samples was observed by TEM to characterize the microtexture of diamond synthesized from stearic acid. The formation temperature of this diamond is about 800℃ and significantly lower than that of previous NPD from graphite.