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As the above formula shows, there are cation vacancies on both tetrahedral and octahedral sites in this titanomaghemite, the majority being on the octahedral sites. The authors believe the evidence of the Moessbauer spectra points to Fe/sup 2 +/ on the octahedral site. Moessbauer parameters ...
The H atoms occur in different environments around the vacant Z site in the two samples, and they may also bond to the O atoms surrounding the X and Y sites, if they contain vacancies as indicated by the refinement sofs. Two cubic phases are intergrown in each sample and cause strain ...
Pan Y, Dong P, Chen N (2003) Non-Henry’s Law behavior of REE partitioning between fluorapatite and CaF2-rich melts: Controls of intrinsic vacancies and implications for natural apatites. Geochim Cosmochim Acta 67:1889–1900 Article Google Scholar Papike JJ, Zoltai T (1965) The crystal str...
in different regions. In 1961, the pandemic conditions happened in Indonesia and spread to Hong Kong, Philippines and westwards finally invading India in 1964. By 1966, it had spread throughout the Indian subcontinent and West Asia. In 1970s, it extended to Africa and different parts of ...
kiln for 48 h. The brick samples were subsequently fired in the tunnel kiln between 1690 and 1700 °C at a push rate of 16 cars per day, and a soaking time of 3 h at the peak temperature. All refractory samples were prepared at Vereeniging Refractories (Pty) Limited (South Africa)....