EPR and optical study of Mn2+ doped ammonium tartrate single crystals.
EPR study of Mn2+ doped ammonium tartrate single crystals is carried out at room temperature. The spin Hamiltonian parameters are: gx=1.9225+/-0.0002, gy=1.9554+/-0.0002, gz=2.1258+/-0.0002, A=(78+/-2) x 10(-4) cm(-1), B=(75+/-2) x 10(-4) cm(-1), D=(191+/-2) x 10(-4) cm(-1), E=(61+/-2) x 10(-4) cm(-1) and a=(22+/-1) x 10(-4) cm(-1) for site I and gx=1.9235+/-0.0002, gy=1.9574+/-0.0002, gz=2.0664+/-0.0002, A=(78+/-2) x 10(-4) cm(-1), B=(75+/-2) x 10(-4) cm(-1), D=(180+/-2) x 10(-4) cm(-1), E=(57+/-2) x 10(-4) cm(-1) and a=(22+/-1) x 10(-4) cm(-1) for site II, respectively. The observed optical bands are fitted with inter-electronic repulsion parameters (B and C), crystal field parameter (Dq) and Trees correction (alpha) and the values found are B=752, C=2438, Dq=765 and alpha=76 cm(-1). The data obtained are further used to discuss the surrounding crystal field and the nature of metal-ligand bonding in the crystal.
Kripal
Ram
R
Department of Physics, University of Allahabad, Allahabad 211002, India. ram_kripal2001@rediffmail.com
Govind
Har
H
Bajpai
Manisha
M
Maurya
Manju
M
D002623:Chemistry Techniques, Analytical / Q000379:methods; D003460:Crystallization; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy; D007477:Ions; D008024:Ligands; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D008956:Models, Chemical; D055095:Optics and Photonics; D010100:Oxygen / Q000737:chemistry; D013644:Tartrates / Q000737:chemistry*; D013696:Temperature
D007477:Ions; D008024:Ligands; D008670:Metals; D013644:Tartrates; D008345:Manganese; D010100:Oxygen; C029768:tartaric acid