Structural features of two novel alluaudite-like arsenates Cd<sub>1.16</sub>Zn<sub>2.34</sub>(AsO<sub>4</sub>)<sub>1.5</sub>(HAsO<sub>4</sub>)(H<sub>2</sub>AsO<sub>4</sub>)<sub>0.5</sub> and Cd<sub>0.74</sub>Mg<sub>2.76</sub>(AsO<sub>4</sub>)<sub>1.5</sub>(HAsO<sub>4</sub>)(H<sub>2</sub>AsO<sub>4</sub>)<sub>0.5</sub>
- Author(s)
- J. Stojanovic, Tamara Đorđević, Ljiljana Karanovic
- Abstract
Two new compounds, Cd1.16Zn2.34(AsO4)1.5(HAsO4)(H2AsO4)0.5 (1) and Cd0.74Mg2.76(AsO4)1.5(HAsO4)(H2AsO4)0.5 (2), have been prepared hydrothermally. Their crystal structures consist of chains of edge-sharing M1O4(OH0.5)2, M1aO4(OH0.5)2, M2O5(OH0.5), and M2aO5(OH0.5) octahedra (M1, M1a = Zn, Cd; M2, M2a = Zn for 1, and M1, M1a = Mg, Cd; M2, M2a = Mg for 2) that are stacked parallel to (1 0 1) and are connected by the [(AsO4)0.5(AsO3(OH))0.5]2.5- and [(AsO4)0.5(AsO2(OH)2)0.5]2- tetrahedra. These chains produce two types of channels parallel to the c-axis. Cd atoms are located in channels 2, while in channels 1 are situated hydrogen atoms of OH groups. The infrared spectra clearly show the presence of broad Osingle bondH stretching and bending vibrations centred at 3236, 2392 1575 and 1396 cm-1 in (1), and 3210, 2379 1602 and 1310 cm-1 in (2). The Osingle bondH stretching frequency is in good agreement with O?O distances. Furthermore, structural characteristics of compounds with similar alluaudite-like structures were discussed.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- University of Belgrade
- Journal
- Journal of Alloys and Compounds
- Volume
- 520
- Pages
- 180-189
- No. of pages
- 10
- ISSN
- 0925-8388
- Publication date
- 2012
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/a64fec74-7285-4fe7-82b9-29cb7e5a746b