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

[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.