caa a22 4500 445387815 CHVBK 20180317143037.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11144-011-0287-2 doi (NATIONALLICENCE)springer-10.1007/s11144-011-0287-2 Thermogravimetric studies and kinetics of decomposition of ammonium yttrium fluoride [Elektronische Daten] [A. Mukherjee, S. Mishra, N. Krishnamurthy] The kinetics of thermal decomposition of ammonium yttrium fluoride intermediates, (NH4)3Y2F9 and NH4Y2F7 were studied by a non-isothermal thermogravimetric (TG) technique at different heating rates. Kinetic parameters were determined from the TG curves by using two model-free methods, i.e. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The activation energy (E) for the decomposition of (NH4)3Y2F9 was dependent on the fraction converted, α; its value was 152kJ/mol (for α=0.1-0.3) and 232kJ/mol (for α=0.4-0.8) from both models; and the pre-exponential factor (ln(A)) was 43 (for α=0.1-0.3) and 59 (for α=0.4-0.8). For the decomposition of NH4Y2F7, the activation energy (E) was independent of the fraction converted, α, and its value was 123kJ/mol; the pre-exponential factor (ln(A)) was 31. The decomposition of (NH4)3Y2F9 proceeds by one-dimensional diffusion (for α=0.1-0.3), followed by two-dimensional diffusion (for α=0.4-0.8). The decomposition of NH4Y2F7 occurs by random nucleation and growth. Akadémiai Kiadó, Budapest, Hungary, 2011 Kinetics nationallicence Ammonium yttrium fluoride nationallicence Thermogravimetry nationallicence (NH4)3Y2F9 nationallicence NH4Y2F7 nationallicence Mukherjee A. Materials Processing Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut Mishra S. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, 400076, Mumbai, India aut Krishnamurthy N. Materials Processing Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/1(2011-06-01), 53-70 1878-5190 103:1<53 2011 103 11144 https://doi.org/10.1007/s11144-011-0287-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0287-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mukherjee A. Materials Processing Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 700 1- Mishra S. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, 400076, Mumbai, India aut NATIONALLICENCE 700 1- Krishnamurthy N. Materials Processing Division, Bhabha Atomic Research Centre, 400085, Mumbai, India aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/1(2011-06-01), 53-70 1878-5190 103:1<53 2011 103 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer