R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[R2-11] A unique arsenic crystalline phase with an ordered arrangement of low- and high-pressure structure parts

*Akira Yoshiasa Yoshiasa¹, Makoto Tokuda², Masaaki Misawa³ (1. Kumamoto University, 2. Tohoku University, 3. Kyushu Sangyo University)

Keywords:

pararsenolamprite,electronic structure,crystal structure,first-principles computational method

The crystal structure of Pnm2₁-As (pararsenolamprite) is a novel structure in which the basic portions of metalic grey-As and semi-conductor black-As are alternately arranged at the atomic level. Total charges are clearly divided into positive and negative in the same elements for the grey-As and black-As portions, respectively, is of importance. The sequence in which one-dimensional electron donor and acceptor portions alternate in the layer will be the first description.