Properties of Thin Metal Films 



G65 



measured by the interference method were made and their 

 thicknesses measured. 



After the films were all made they were put into a glass 

 vessel. This vessel was exhausted as far as possible and 

 dried ; it was then sealed off and heated for seventy-three 

 hours to a temperature of 110° C. All the films were thus 

 treated exactly alike. 



The resistance of the films was not measured before ageing 

 in order that they might be handled as little as possible. 

 The values obtained for this set of film> 



are given in Table VI. 



Table VI.— Resistance of Platinum Films. 





Dimensions of Film in cm. 



Time of 



Kesistance 



Res. pei- 



No. of 



film. 















cm. sq. 









deposit 



After 







times 



Length. 



Breadth. 



Thickness. 



in min. 



heating 



per cm. 



per cm. 

 cube 



time of 

 deposit. 













73 hours 



square. 



X106. 



66* 













to 110° C. 









1-32 



116 



5-92x10-6 



10 



16-58 



14-57 



86 



146 



75* 



1-32 



118 



4-92 „ 



7^ 



20-24 



18-09 



89 



136 



69* 



117 



116 



2-95 „ 



5 



26-605 



26-39 



79 



132 



80* 



1-47 



i-ie 



2 49 „ 



4 



34-34 



27-09 



68 



108 



74 



1-32 



M5 



2-15 „ 



3^ 



39-69 



34-59 



74 



121 



64 



1-50 



145 



1-85 .. 



3" 



55-19 



42-31 



78 



127 



76 



1-34 



1-20 



1-09 .. 



2f 



50-71 



45-41 



77 



125 



68 



118 



116 



1-53 ., 



2i 



53-57 



52-66 



81 



132 



72 



119 



1-17 



1-37 ;, 



2i 



58-49 



5750 



79 



129 



65 



1-41 



1-19 



1'22 ,. 



•> 



71-72 



6053 



74 



121 



73 



1-20 



114 



108 „ 



If 



73-65 



69-97 



76 



122 



71 



1-17 



1-16 



0-91 „ 



H 



88-85 



88-08 



80 



132 



78 



1-46 



111 



077 ., 



H 



128-5 



97-69 



75 



122 



C7 



1-38 



112 



o-62 ;; 



l 



102-2 



82-94 



51 



83 



77 



1-51 



144 



046 .. 



1 



320-7 



2421 



111 



182 



81 



1-48 



1-07 



0-38 „ 



371 sec. 



564-8 



408-3 



155 



255 



70 



148 



148 



031 „ 



30 „ 



5793 



579-3 



179 



290 



82 



118 



1-05 



026 , 



25 „ 



1332-5 



11856 



308 



494 



79 



1-43 



109 



021 „ 



20 „ 



3409 



2598-4 



546 



866 



The films are numbered in the order in which they were made. 

 As far as possible a thick and a thin film were made alternately. 

 The films whose thicknesses were measured directly are 

 marked with an asteri>k. 



It will be seen from Table VI. that with the exception of 

 the very thin films the resistance per sq. cm. multiplied by 

 the time of deposit is fairly constant. Xo. G7, however, seems 

 to be a very marked exception to the above, but as the time 

 of deposit is the only means of knowing the thickness, it 

 may be that the film was deposited in 1^ min. instead of 



