Publications by authors named "Hicham Nimoh"
Article Synopsis
- Blue/turquoise crystals of SrCr(PO) were synthesized through a high-temperature reaction, achieving a prismatic shape with dimensions up to 1 mm and a complex crystal structure that includes both Cr(1) and Cr(2) ions.
- The electronic configuration of these ions leads to significant Jahn-Teller effects, resulting in distinct square-pyramidal and square-planar coordination, and a layered arrangement that affects their magnetic properties.
- At low temperatures, the material exhibits interesting magnetic ordering transitions, including an antiferromagnetic structure for Cr(1) and a subsequent ordering of Cr(2), which alters the crystal's symmetry and underscores the complexity of interactions within the chromium phosphate framework.
The newly discovered series of layered monophosphate tungsten bronzes (L-MPTB) [Ba(PO)]WO consist of -layer-thick slabs of WO6 octahedra separated by barium-phosphate spacers. They display a 2D metallic behavior confined in the central part of the perovskite slabs. Here, we report the missing = 2 member of this series, containing the rather uncommon W5+ oxidation state.
View Article and Find Full Text PDFPhosphate tungsten and molybenum bronzes represent an outstanding class of materials displaying textbook examples of charge-density-wave (CDW) physics among other fundamental properties. Here we report on the existence of a novel structural branch with the general formula [Ba(PO ) ][W O ] (m=3, 4 and 5) denominated 'layered monophosphate tungsten bronzes' (L-MPTB). It results from thick [Ba(PO ) ] spacer layers disrupting the cationic metal-oxide 2D units and enforcing an overall trigonal structure.
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