Digest of Literature on Dielectrics Volume XI (1947) / Chapter Skim
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I Dielectrics
I Dielectrics
Pages 1-35
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From page 1... ...
,C of tic pape rs ~ togs the r filth cons idorab Ic discus s ion ~ ~ tic s cr:tcd at tho symposium on d~octr~cs held at rho Univcrsity of Bristol in ApriTl 1946. Most of the Bristol papers arc rofc~rod to-ind~ridually Cal thor in tI: ~ s or one -of thin for lowing soc i-` ons .
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From page 2... ...
o<~o i r~tcr-~+n off on c1~ cicr-tr~c cons Cant Was app;~cc~ Abe ~, elf .~c~crlt for s olids than for Abounds .: Ad: the 1 attor c. s c, dipo]
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From page 3... ...
In a lator paper Poldorl2 gas a short ro:Tiow covcrir~g Cuss of compIcx quantities in ~c~c~ibing dicIcctric propcrtics, ~ omc phonomcna leading to mc~hods of mcasur~ng talc dicloc-~c constant and lass factor, the dopor~oncc; of twos propcrtics or ration fiance ~ and the success of ccrtair~ novels- ire intcrprct~ng to facts. Lowin:3 has computed the pluck of dicicctric constant and por~ncabi1 its of a mixture consisting of ~ homogoncous xnatcrial in whic'n particice arc i~.~bcd~cd.
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From page 4... ...
thc Lor-ntz for~,1ula fcr tl~c sha:? c of abs o~p tion lin~s is irco-~rcct cxcopt ncar rosonancc, and a corroo ~ to~ula ,~F~aS do:~.vod ^.nd d~cu3 s cc]
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From page 5... ...
As dielectric loss, absorption current, and loss angle ore ~nter.related; equivalent results can be interred from the 5tU07 0= an, one, while a comparison of there rival- eliri:inato cordon parameters. the emplo~'rnent of time-dependent fields oilier than constant or s~nuso~l has '3articu~ar applications, especially where direct~° onal fields of short causation are required, and for the stud; of discontinuous nonlinear phenomena such as discharges.
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From page 6... ...
s,:_~,rt. Irhe molar coxes tents for these fou ,~ effects ewe ceil cv-~ ~ Jeer 'a j orl the bas is of the cogent z Portia to.
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`ene The results he used ~o cat cud ate the apparent `- ~ echo c home in solution Osiris; the Debye equation and volume f;~act~ions~ Tile customary e:~trapolation tcE_ ~ for c=1culat:~ng the din one night of the ecu~valent gas failed to giver cons~s~er~t rests,, ~x~rapolating~ho,-.ve~er' Cot _ l.7 genre values Rich were not only self consistent b~t also agreed With the exper::no~-detor~mi^ned Ache in the vapor state. Goss Is Forrest ;ave ~ better a ;rec~:ont than the re s ~ ~ Plessner and Rlcharcls28 have obtained curves of power factor vs frequency over a range of te~-pora-07~^ne~ for solutions of esters in three contrast~;.n~ ~iv~cLroca:ebon ~?
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From page 8... ...
-~-'ctu1"~;l~. 1~- t6O ~ atoner c Ask t2.~.` power factor IS cx''.:~.
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From page 9... ...
'this r~.xi~:n~r.~ of power factor Alas bcor~ stud-, od bolts as a function of frco.ucncy at a fixed tcr.~r~ turn ^.nd Lea a ~nct~:r~ of tol^~por? .turo at f:~od freq,~'r~c¢.
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From page 10... ...
at ter`~perat~res as hi; as 550°'C. 5~-'rith Increase in the an~-~eal~n~ te~pera~re, the dielectric loss finest increased Kilo 100-200?
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This shows th~t cone anomie LIT must lie Art the clarified dielectric cons pant alone and not in Ache interaction of the-claxnped dielectric constant and -he phenol electric effect. ~isrmode]
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the cubic form has no permanent dipole moment . 4 ,, and that the temperature coefficients of the e?
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From page 13... ...
ion in these compounds is ' displaced from tree center 'of the enclosing; octahedron of oxygen ions they Pained the main features of tile variation with temperature of the structure and of the eq,.ieleci;~? ic constant, and shoved tile existence of ferro-electric propel~t~es associated with a tetragonal structure.
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From page 14... ...
. Ricamo53 sur~re';red previous expe:L':rnentel work or the e~ec~-str~ct_ve and piezodie~ect~ic effects,, and eared the repro city relation between theme 7~eas~reinerits were reported on i;he piezodie.lectric effect in gloats O A c=lind~cal glass tube capacitor wraith silvered inner and outer surface elec-~'odes was stressed normally to the lines of electric force under various loads, and the -variation of its capacity eras measured O :Por the glass sample e~an~ine~9 (lie p~e/zodielectric coe~cientt'l''; ?
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the Lamb58 obtained experimental curves of dielectric constant and power factor for ice (a) at 10~0 c,/s oared the.
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From page 16... ...
brature ran:;e 25° to 95°C was subs Partially linear and cyclic, arid a single teri:perat~.re coefficient figure defines the dielectric behavior aacquatelyO The r~easu:eed coefficient figures showed an even spread from 6x10-6 to lUxlO-6o il`Iica p la tos -lie I th gas inc lies ions p Produced irregular ( and mos t l ,~ ver;: large ~ c'nanges of ca~? acitar~ce Irl~ th temperature, and -par~t~cular?
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From page 17... ...
Changes of dielectric constant durl.r~; irradiaticn were observed by deGroot68 wee meas-~ng the charge o* r~esonar~t frea,uenc;y of a circuit cor,:tainin.~; a capacitor with a phosphor as dielectric, The light emitted by the phosphor eras measured .2~°~°electrical;~;Sr.
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From page 18... ...
The ball~c deviat~on, b, increased ~vith T~. and: s howe ~ ~ s ome~ t endenc ~ t o s ~ tu ra ~ '' on ~ A ~ amp ie ~ ~ ~ ong 9 ~ as ~ ~ T:le ettective dielectric constant, there~ore, was appro:~lrilate]
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From page 19... ...
. Rogers75 has measured the dipole moments of certain primary, secondary Land tertiary aliphat$c fluorides, cyanides and amines in benzene a olution,, Tile fluorides and cornices showed small
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From page 20... ...
ten ~ third investigation, Rogers77 obtained dipole momenta arid. ~:Itra:~oJet absorption spectra data for methyl vinyl Iretone, 3~4~epoxy~-bv~tene, 2-methylcyolo~ropyl cyanide, c~rclopropyl methyl ketones propylene oxide, pheny=eyoJopropane, and acrylonitrile.
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Gur'Yanova32 has measured the dipole moments and the molar polarizati on and refraction for sodium light of some organo-SO2C1 compounds ~ His measurements were used for iiscussi.n.- the importance of resonance si;ructures, the poc3it] 0n of -- he -troll group in the benz;er~e And naphthalane rings, the restricted rotation of _SO2Cl groups ~ etc.
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From page 22... ...
~;~.nabe8~O Prom -the exerts mental results ~ vitas concluded - that bile molecules of these c omp ounds take ~ =~ onIv the t`~ans ~omn in i;~= so~id stat=', The. co.~,~`ster~ce of the tne trar~s a~ld ~;auche fos`ns ~ r1 the ~.~xq~lid s ta=.e ~L]
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From page 23... ...
The suggested interp~ox: also accounts both for the observed magnitudes of tne ac ~ vation energy, and for the linear relation between changes in activation energy and er~tropy,. An apparatus for observation of the Kerr electro-opt~c effect in liquids and polymers using microsecond electrical pulses was presented and evaluated by Base and De~raney9 , Among other results, oscillograms were given showing an interesting differer~ce between orientation and relaxation time, and others showing clearly both orientation and distortion polarization simultaneously.
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From page 24... ...
An alky1' chloride having a 'dipole moments of 2.,00 ~ or greater wil ~ coordinate while one having -a moment of less than WOO evils not.
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T] hen the electric field intense ty was changed suddenly, an after effect of the conductivity took place.
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26 field, and decreased e~-~? onent,ial'~ Wraith t!
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I~ne vi s c o ~ i ty o f p o la r liqui ds generally increased with the electric field. ::it'n two liquids of the sane dipole moment, the effect was greater for the molecule with the ~ anger chain.
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;;~ ~ ~g ~ncreasediat .t:~rst, t~:en^a:? l,roac]
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From page 29... ...
Ibere is no noticeable tendency for thee other disc to rotate until an electric circuit is completed across the discs; then the Ado rotate as a unit with considerable force and persistence . l.~~en tne circuit is opened, the dri wren disc stops immediately.
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From page 30... ...
hillipts Laboratory by l-~. t~evers entitled, -"Tl~ ~ elation ~etween the Power l~actor and the Temperature Coefficient of Die}~ctric Constant of Solid 19.
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27. Paran jpe, G
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Pa, Phys' Rear., ~' 869 `1947' Honker Ga He~ cold Fan Antes J ~, Cole-~cekblad 672-9 ~ 1947 )
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g "Tab~ e of E'ectr~c Dipole Ivioments" g [ate. tor Insulation Res.
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From page 34... ...
9 }e AmO OkemO SocO 9 6~9 110 -13 ~ ~947 ~ 980 Gi'~:lottO, Lo, a~cL. Gigli9 A.9 PhysO Re~rO, 719 217-12 (FebO 1 j 1947)
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