Crystal Structure and Thermal Decomposition of Copper(II) Strontium(II) Formate

Monoclinic–orthorhombic phase transition in Ba2Cu(HCOO)6 crystals: a Raman scattering study

“…As the acoustic phonons belong to the representations A C 2B, 321 Raman active modes are expected in the monoclinic phase of the Ba 2 Cu(HCOO) 6 crystal.…”

“…9 -11 In this structure, the formate groups occupy a set of two non-equivalent 8d [C 1 8 ] general sites and a set with two non-equivalent 4c [C s 4 ] special sites, barium cations one 8d [C 1 8 ] site and copper cations one 4c [C s 4 ] site. Hence, the 324 modes of the orthorhombic Ba 2 Cu(HCOO) 6 can be decomposed in terms of the irreducible representations of point group D 2h in the following way: 13…”

“…3,5 -9 For the compound Ba 2 Cu(HCOO) 6 , Vega et al 9 studied its crystalline structure at room temperature, and also some of its properties as a function of temperature, by using different techniques. The thermal behaviour of Ba 2 Cu(HCOO) 6 crystals was investigated by differential scanning calorimetry (DSC), optical microscopy and x-ray diffraction. Between 460 and 530 K, this compound decomposes, resulting in BaCO 3 , C particles, Cu, and Cu 2 O, while CO 2 and H 2 O vanish.…”

“…From the results obtained, we were able to understand how the 24 HCOO forming the unit cell are distributed into four sets of C 1 2 local site symmetries. As a continuation of this previous work, we present here a temperature-dependent Raman scattering study of Ba 2 Cu(HCOO) 6 in order to verify not only the stability of its room temperature phase with decrease in the temperature but also the phase transformation observed by Polla et al 10 …”

Thermal Decomposition of Copper (II) Dicalcium (II) Formate

“…We have already studied the thermal decomposition of CuSr (HCOO) and CuCa(HCOO) (2,3). In the present work we study the different stages through which thermal decomposition of CuCa (HCOO) takes place and propose a decomposition mechanism which takes into account the intermediate reaction products and their crystal structures.…”