Summary
The condensation coefficient of lithium and lanthanum fluorids has been measured determining the thichnesses of the thin films grown simultaneously on supports kept during film formation at temperatures from 25 °C to 500 °C. It is found that the condensation coefficient is equal to 1 for LaF3 at 55 °C and for LiF at 60 °C, being less than 1 at higher temperatures.
Riassunto
Si è misurato il coefficiente di condensazione dei fluoruri di litio e di lantanio determinando gli spessori delle lamine sottili formate su sostegni mantenuti, durante la proiezione, a delle temperature comprese tra 25 e 500 °C. Si è trovato che esso risulta uguale a 1 per una temperatura del sostegno minore o uguale a 55 °C per il LaF3 e a 60 °C per il LiF e inferiore a 1 per temperature superiori, decrescendo con legge esponenziale in funzione della temperatura assoluta del supporto.
Реэюме
Иэмеряется козффициент конденсации флоридов лития и лантана, определяя толшины тонких слоев обраэованных в поддерживаюших подложках, во время проекции, при температурах в интервале от 25° до 500 °C. Получается, что он равняется 1 при температуре подложки, меньщей или равной 55 °C для LaF3 и 60 °C для LiF, и меньще 1 при более высоких температурах.
Similar content being viewed by others
References
L. Dunoyer:Compt. Rend. Acad. Sci.,152, 593 (1911).
R. W. Wood:Phil. Mag.,32, 364 (1916).
I. Langmuir:Journ. Amer. Chem. Soc.,402, 1361 (1918).
M. Devienne:Mem. Sci. Phys.,53, 1 (1952).
E. Rutner, P. Goldfinger etJ. P. Hirth:Condensation and Evaporation of Solids (London, 1963).
J. P. Hirth etG. M. Pound:Progr. Mater, Sci.,11, 1 (1963).
J. N. Chirigos, M. T. Symnad etG. M. Pound:Thèse, Carnegie Institute of Technology (1964).
Y. G. Putshinskii:Žur. Tekh. Fiz.,28, 1402 (1958).
H. Mayer etH. Goehre:Proc. Northwest German Phys. Soc. Meeting (1962), Bad Pyrmont.
L. S. Palatnik etA. I. Fedorenko:Sov. Phys. Solid State,7, 2561 (1966).
M. Bourg:Ann. of. Phys.,13, 623 (1962).
H. Mayer etH. Goehre:Vacuum Microbalance Technique,3, 100 (1963), Plenum Press.
B. K. Chakraverty:Adsorption et croissance cristalline, ed. C.N.R.S. (Nancy, 1965), p. 373.
K. H. Behrndt: communication privée.
A. Bourg:Journ. Microscopie,4, 313 (1965).
A. Bourg, M. Bourg etF. Porreca:Journ. Microscopie,5, 421 (1966).
J. Hudson:Journ. Chem. Phys.,36, 887 (1962).
Note ajoutée en épreuves. — Après échange d’opinions avec le ProfesseurPound, il semble que la relation théorique proposée dans la réf. (6) p. 6 soit applicable dans notre cas. Par ailleurs, on admet aujourd’hui que, lors de la formation des couches minces, l’équilibre thermodynamique est près d’être établi at que, en conséquence, la température du support lors de la projection est pratiquement celle de la couche; les hypothèses de la réf. (17) doivent donc être abandonnées.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bourg, A., Bourg, M. & Porreca, F. Coefficient de Condensation de Couches Minces de Fluorures. Nuovo Cimento B (1965-1970) 52, 98–105 (1967). https://doi.org/10.1007/BF02710654
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02710654