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Dostęp zamkniętyUnexpected Coexisting Solid Solutions in the Quasi‐Binary Ag<sup>(II)</sup>F<sub>2</sub>/Cu<sup>(II)</sup>F<sub>2</sub> Phase Diagram**
| dc.abstract.en | High-temperature solid-state reaction between orthorhombic AgF2 and monoclinic CuF2 (y=0.15, 0.3, 0.4, 0.5) in a fluorine atmosphere resulted in coexisting solid solutions of Cu-poor orthorhombic and Cu-rich monoclinic phases with stoichiometry Ag1−xCuxF2. Based on X-ray powder diffraction analyses, the mutual solubility in the orthorhombic phase (AgF2 : Cu) appears to be at an upper limit of Cu concentration of 30 mol % (Ag0.7Cu0.3F2), while the monoclinic phase (CuF2 : Ag) can form a nearly stoichiometric Cu : Ag=1 : 1 solid solution (Cu0.56Ag0.44F2), preserving the CuF2 crystal structure. Experimental data and DFT calculations showed that AgF2 : Cu and CuF2 : Ag solid solutions deviate from the classical Vegard's law. Magnetic measurements of Ag1−xCuxF2 showed that the Néel temperature (TN) decreases with increasing Cu content in both phases. Likewise, theoretical DFT+U calculations for Ag1−xCuxF2 showed that the progressive substitution of Ag by Cu decreases the magnetic interaction strength |J2D| in both structures. Electrical conductivity measurements of Ag0.85Cu0.15F2 showed a modest increase in specific ionic conductivity (3.71 ⋅ 10−13±2.6 ⋅ 10−15 S/cm) as compared to pure AgF2 (1.85 ⋅ 10−13±1.2 ⋅ 10−15 S/cm), indicating the formation of a vacancy- or F adatom-free metal difluoride sample. |
| dc.affiliation | Uniwersytet Warszawski |
| dc.contributor.author | Koteras, Kacper |
| dc.contributor.author | Jezierski, Daniel |
| dc.contributor.author | Grochala, Wojciech |
| dc.contributor.author | Lorenzana, J. |
| dc.contributor.author | Mazej, Z. |
| dc.contributor.author | Połczyński, P. |
| dc.contributor.author | Domański, M. |
| dc.date.accessioned | 2024-01-26T11:19:12Z |
| dc.date.available | 2024-01-26T11:19:12Z |
| dc.date.issued | 2023 |
| dc.description.finance | Publikacja bezkosztowa |
| dc.identifier.doi | 10.1002/CHEM.202301092 |
| dc.identifier.issn | 0947-6539 |
| dc.identifier.uri | https://repozytorium.uw.edu.pl//handle/item/124172 |
| dc.identifier.weblink | http://dx.doi.org/10.1002/chem.202301092 |
| dc.language | eng |
| dc.relation.ispartof | Chemistry - A European Journal |
| dc.rights | ClosedAccess |
| dc.sciencecloud | nosend |
| dc.title | Unexpected Coexisting Solid Solutions in the Quasi‐Binary Ag<sup>(II)</sup>F<sub>2</sub>/Cu<sup>(II)</sup>F<sub>2</sub> Phase Diagram** |
| dc.type | JournalArticle |
| dspace.entity.type | Publication |