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In this type of bonding the 2s orbital and the three 2p orbitals of the carbon atom are mixed to produce four identical orbitals, a process known as sp3 hybridization. The CS2 molecule is linear and the carbon atom is bonded to each sulphur by a double bond.
4. Conclusions. The isovalent substitution of Sr 2+ by Ca 2+ in Sr 2âx Ca x VO 3 FeAs has been successfully realised in the compositional range 0â¤ x â¤0.5, as shown by the linear decrease in the cell volume with x.This substitution also results in the rapid suppression of superconductivity for x x â¥0.3.urthermore no evidence for Fe/V mixing was observed on either crystallographic site. Synchrotron X-ray diffraction measurements on 9 samples of Sr 2âx Ca x VO 3 FeAs were performed across the entire doping range 0â¤ x â¤0.5 to fully characterise the structural changes imparted by this isovalent substitution.