1. 1. 2. 3. 4. 5. 6. 7. 8. © X-RAY PHOTOELECTRON-SPECTROSCOPY STUDY OF SODIUM GERMANATE GLASS CONTAINING COBALT OXIDE SALIM, MA; KHAWAJA, EE ELSEVIER SCIENCE BV, JOURNAL OF NON-CRYSTALLINE SOLIDS; pp: 71-80; Vol: 151 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary Sodium germanate glasses containing cobalt oxide were studied by X-ray photoelectron spectroscopy (XPS), X-ray excited Auger electron spectroscopy (AES) and optical spectroscopy. The XPS spectra of the starting compounds such as GeO2, Na2CO3 and Co3O4, from the melts of which glasses were prepared, were measured. The Co 2p spectra in Co3O4 had weak satellite lines while these were intense in the glasses. Furthermore in the glasses an increased energy separation between the Co 2p1/2 and Co 2p3/2 spin-orbit components as compared with the Co3O4 was observed. These observations indicated the presence of high-spin cobalt (II) ions in the glasses. Exact identification of the composition of the Co complexes in the glass is beyond the scope of present work. However, of the few possibilities considered here, the formation of the ternary oxide of Co and Ge surrounded by glass matrix has a high probability. Optical absorption spectra were consistent with these proposed structures. References: BAIOCCHI E, 1981, J NONCRYST SOLIDS, V46, P17 BAMFORD CR, 1968, COLOR GENERATION CON, P42 BATTAGLIN G, 1982, J NONCRYST SOLIDS, V50, P119 BRIGGS D, 1974, CHEM PHYS LETT, V25, P493 BRIGGS D, 1988, PRACTICAL SURFACE AN, P477 BRINEN JS, 1978, APPLIED SURFACE ANAL, P24 COTTON FA, 1980, ADV INORG CHEM RAD, P17 FROST DC, 1974, MOL PHYS, V27, P1473 Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

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