### Abstract

The new compound K<inf>2</inf>CoV<inf>2</inf>O<inf>7</inf> has been synthesized by a solid state reaction route. Its crystal structure has been determined using powder X-ray diffraction data (PXRD). The compound K<inf>2</inf>CoV<inf>2</inf>O<inf>7</inf> crystallizes with the melilite-type structure with the tetragonal unit cell parameters a = 8.4574(1), c = 5.5729(1) Å and the space group P4-2<inf>1</inf>m. The structure consists of [CoV<inf>2</inf>O<inf>7</inf>]<sup>2-</sup> layers perpendicular to the c axis separated by K<sup>+</sup> layers. The [CoV<inf>2</inf>O<inf>7</inf>]<sup>2-</sup> layers consist of corner-sharing CoO<inf>4</inf> tetrahedra and V<inf>2</inf>O<inf>7</inf> pyrovanadate units, the linkage of these tetrahedra forming five-membered rings. The K<sup>+</sup> cations occupy distorted square antiprisms of oxygen atoms. The magnetic susceptibility of K<inf>2</inf>CoV<inf>2</inf>O<inf>7</inf> follows the Curie law χT = C with an effective magnetic moment μ<inf>eff</inf> = 4.71 μ<inf>B</inf>.

Original language | English |
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Pages (from-to) | 7-10 |

Number of pages | 4 |

Journal | Materials Research Bulletin |

Volume | 71 |

DOIs | |

Publication status | Published - 9 Jul 2015 |

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### Keywords

- Crystal structure
- Inorganic compounds
- Layered compounds
- Magnetic properties
- X-ray diffraction

### ASJC Scopus subject areas

- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials