High Temperature Vaporization Behavior of Oxides

By Lamoreaux, R. H.

Book Id: WPLBN0000659651
Format Type: PDF eBook:
File Size: 2.60 MB
Reproduction Date: 2005

Title:	High Temperature Vaporization Behavior of Oxides
Author:	Lamoreaux, R. H.
Volume:
Language:	English
Subject:	Technology., Reference materials, Technology and literature
Collections:	Techonology eBook Collection
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Citation APA MLA Chicago H. Lamoreau, B. R. (n.d.). High Temperature Vaporization Behavior of Oxides. Retrieved from http://www.gutenberg.us/

Description
Technical Reference Publication

Excerpt
Background: Oxide materials are used or encountered in a wide variety of high temperature applications where vaporization rates and thermodynamic stabilities are often limiting factors. The efficient design and operation of high temperature devices and processes requires reliable information about the stability and volatility of these oxides so that vaporization losses and component lifetimes can be predicted. Despite continuing research efforts and the use of increasingly sophisticated techniques, there are still many gaps in our detailed vaporization thermodynamics of metal oxide systems. This puts a premium on critical review of the literature and selection of the necessary thermodynamic data. Even in cases where most of the requisite data are compiled, however, the user still must resort to a significant amount of additional calculations, sometimes unfamiliar, in order to evaluate vapor composition and vaporization behavior for specific environmental conditions. Thus we perceive a definite need for critic?

Table of Contents
Contents 1. introduction ......................................................... 152 b. Na-O System .......................................... 1.1. Background .................................................. 152 c. K-O System ............................................ 1.2.Scope ........................................................... 152 d. Rb-O System .......................................... 1.3. Literature Reviewed ..................................... 15 2 e. Cs-Q System ............................... ;. .......... 2. Thermodynamic Properties ................................. 153 4. Acknowledgments ............................................... ~+Bis~ssion; ;. .......................................... - . .- ;; :-.. .; -+53 5 3 e f e r m . ... ...................................................... a. Evaluation of Data .................................. 153 b.Symb01s ................................................... 153 List of Tables c. Units ........................................................ 153 1. Alkali metal oxides melting above 300 IS, their 2.2. Selected Thermodynamic Data .................... 159 melting temperatures, and enthalpies of fusion . 2.3. Condensed Phase Thermochemical Data .... 159 2. ~ i b ebne~rgy functions of substances cncoun- a. Li-0 Phases ............................................ 159 tered in the high temperature vaporization of al- bc.. NK-aO-0 PPhhasaesse s.. ..................................................................................... . 115599 3. k~ali m~eta~l ionxcihdreesm ..a..e...n.a.lt.b. .o..v.~..e. ..2..9~..8....1..5. . ...K... ..o..f. ..s..u..b. - d. Rb-0 Phases ........................................... 160 stances encountered in the high temperature va- e. 0P hases ............................................. 160 porkation of alkali metal oxides ........................ 2.4. baV.. apDMoir(s gcS)up Ssepscieoicenise T.s. ..h....e....r..m........o....c...h.....e...m.......i..c....a...l... .D........a....t..a.... ........................ .. . 111666111 4. tv-eaml uHpee sGr a)o/Rtfu Aroe, f&v saup(b2os9rtia8zn acKtieo)s/ne R no,c f soa;,ul,/kRnat, elir mede iatnan ltd ho e(xH hidi$ge,hs c. Mqg) Species .......................................... 161 5. Sources of data in Tables 1 through 4 ................. d. MO,(g) Species .................. ;. .................... 161 6. Molecdar colls~ltosf the a l a i metal MO e. M2(g)S pecies ........................................... 162 por species .......................................................... f. M,O(g) Species ........................................ 162 7. Values of atomic and used g. M202(g)S pfcies ....................................... 163 in Rittner electrostatic model cdculations of the h. Other Species ........................................... 164 dissociation energies of alkali metal MO vapor 3. High Temperature Equilibria and Vaporization species ................................................................ Rates .................................................................... 164 8. Enthalpies of formation and dissociation ener- 3.1. Equilibrium Propertics of Alkali Oaides ...... 164 gies of the alkali metal MO vapor species .......... 3.2. Mathematics of Vaporization Calculations .. 164 9. ofthe metal MO, va- 3.3. Vaporization Rate Calculations ................... 165 por species .......................................................... 3.4. tVai.v aepL Coi-roOizn sdStiiytoisonten mBs .e ...h....a...v....i...o....r... ...l...l..n....d....e....r.. ....R......e....p.....r...m.......n....t...a....-.. 116666 110 . MpMooor llseepcceuucllaiaerrs cc .oo..nn..s.s.tt.aa..nn..tt.s.s. o.o.f.f. t.th.h.e.e. .a .a.l.lk.k.a.a.l.li. i.m .m..e.e.t.ta.a.l.l M. .M..,.0.2.2.0. .v.v ..aa.-- por specles .......................................................... @ 1984 by the US. Secretary of Commerce on behalf of the United States. 12. vibrational fundamentals of mi metal M,O, This copyright is assigned to the American Institute of Physics and the American Chemical Society. vapor species ...................................................... Reprints available from ACS; see Reprints List at back of issue. 13. Oxygen pressures of two-solid-phase regions ..... 0047-2689/84/010151-23/$06.0 151 J. Phys. Chem. Ref. Data, Yol. 13, No. 1,1984