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XJ9700200
PI 4-97-64
C.A.JIaHMJIKHH1, E.Jl.flapOBCKHH
H3MEPEHHE flHCnEPCHOHHbIX KPHBbIX OOHOHOB B HHOBHH HA BPEMflHPOJIETHOM CHEKTPOMETPE HEHTPOHOB AHH-2HH HA PEAKTOPE HEP-2
THU PO <t>H3HKO-3HepreTHHeCKHH HHCTHTyr, 06hhhck
0
BeedeHue
Mcxoa BpeMeHH npojiexa npHMeHjuica H3MepeHHH 4>ohohob Ha
HMnyjibCHOM peaKTope HEP-30 eme b xonqe 60-x foaob. HsMepeHHa
npoBOAHJiHCb Ha cnexxpoMexpe o6paxHotf reoMexpHH, T.e. c (|)HKCHpoBaHHOH
3HeprHCH pacceflHHbix HeiixpOHOB [1]. Ebina noKasana npHHqHnHajibHaa
B03M0)KH0CXb HCH0Jlb30BaHHfl HMHyjIbCHblX peaKTOpOB JXSW H3MepeHHH (J)OHOHHbIX
h MarnoHHbix B036y)KAeHHH b KpHCxanjiax. Taxxte 6buiH npeAJicoxeHbi mcxoahxh,
H03B0JlflK)mHe npOBOAMTb H3MepeHH« (J)OHOHOB C BOJIHOBbIMH BCXXOpaMH B
3aAaHHbix CHMMeTpHHHbix nanpaBJieHHflx oGpaxHOH peuiexKH [2].
HOAOGHbie HCCJICAOBaHHfl npOBOAHJIHCb H Ha MHOXOAexeKXOpHOM
cneKxpoMexpe npaMOH reoMexpHH /1HH-1M [3]. H3MepeHHH, BbinojineHHbie
A.A.LLIxaxyjiOH h A.K.FopAKwiHHbiM, noxaaajm, hxo xax h b cnyqae
cneKxpoMexpa oSpaxHOH reoMexpHH, na cnexxpoMexpe /JHH-1M mojkho
H3MepflXb (|)OHOHbI C 33A3HHbIM HanpaBJICHMCM BOJIHOBOrO BCKXOpa npH
cooxBexcxByiomHX Bbi6paHHOMy yrny pacceaHHA bojihobom Bexxope naAaioinHx
HefixpoHOB h opHeHxapHH KpHcxajuia. ripn 3xom Ha ApyrHX Aerexxopax
OAHOfipeMCHHO Ha6jHOA3K)XCfl ^JOHOHbl C HpOH3BOJIbHbIMH BOJIHOBbIMH BCXXOpaMH
b hjiocxocxh pacceaHHH.
B AaJibHeiimeM xexHHxa BpeMeHH nponexa npaxxHnecxH nepecxajia
HCH0Jlb30BaXbCfl AA* HCCJICAOBaHHfl AHCnepCHOHHbIX SaBHCHMOCXefl
3JieMCHXapHbIX B036yKAGHHH B XpHCXaJIJiaX. 9x0 6bIJIO CBB33HO xax C HH3XOH
HHXeHCHBHOCXbK) HMHyjIbCHblX HCXOHHHXOB HeHXpOHOB AA« H0A06H0F0 pOA3
SXCnepHMCHXOB, xax H C MCXOAHHeCXHMH OCo6eHHOCX»MH MCXOA3. riOSTOMy
H3MepeHHB Ha peaxxope HEP-30 (jjaxxHiecxH orpaHHHHJiHCb HaGinoAGHHeM
OXAGJIbHblX (j)OHOHOB - XOHHOCXb 3XCnepHMeHX3JIbHbIX ASHHblX 6bIA3
HeAOCXaXOMHOH RSIX HSMepCHHH AHCnepCHOHHbIX KpHBbIX.
B nocjieAHee speMa, c nycxoM moiahwx HMnynbCHbix hcxohhhxob hchxpohob,
OXHOLUeHHe X HCCJieAOBaHHHM 3JieM6HXapHbIX B036y»AeHHH B MOHOXpHCXaJUiax
MexoAOM BpeMeHH nponexa nepecMaxpHBaexca. CneqHajibHbie cnexxpoMexpbi jijm
1
HccjieflOBaHHfl MOHOKpMcrajiJiOB co3Aanbi b AnruMM (PRISMA b RAL ISIS) w
.flnoHHH (MAX b KENS).
B CBH3H C 3THM npeACXaBJIfleX HHTepeC npOBCACHKe M3MepeHHH ^HCnepCHH
(|)OHOHOB B MOHOKpHCTaJUiaX Ha MHOrOfleTCKTOpHOM BpeManponexHOM
cnexxpoMexpe HefixpOHOB na peaxxope HEP-2.
B ashhoh paGoxe aHajiH3HpyiOTCB bo3mohchocth H3MepeHH% AHcnepcnoHHbix
3aBHCHMOCT6H (f)OHOHOB H3 CneXXpOMeXpe npHMOH FeOMeTpHH H npHBOABTCH
peayjibiaTbi win hho6hh.
1. Bbi6op ycnoeuu oKcnepuMOHma
l.l. MsMepeHHfl neynpyroro pacceaHHfl hchtpohob npoBOAHJiHCb Ha
cnexxpoMexpe no BpeMCHH nponexa /(HH-2riM na HMnynbCHOM peaxxope HBP-2
[4].CnexTpOMeTp ^HH-2riH HBnaexca cnexxpOMexpOM npaMon reoMexpHH c
MOHOXpOM3XH3apHeH H3^310Il^HX H3 o6pa3GH HGHXpOHOB H3 nepBOH HpCJICXHOH
6a3C H 3H3J1H30M 3H6pXHH paCCCflHHblX HCHXpOHOB HO BpCMCHH npOJiexa BXOpOM
6a3bi. HanajibHaB anepxHfl HenxpoHOB MO)xex BapbHposaxbCB b AHanasone
2-50 M3B, a HaJiHHHe 6ojibinoxo HHCJia (JjHKCHpOBaHHbix AexexxopoB (ao 60) oOecneHHBaex uiHpoxHH Bbi6op ycjiOBHH axcnepHMenxa. H3MepnxejibHbiH
MOAyJib no3BOjmex perHcxpHpoBaxb pacceaHHbie HCHxpoHbi aa« 32 HesaBHCHMbix
yrJIOB OAHOBpeMCHHO.
B AaHHbix H3MepeHHflx Hcnojib30BajiHCb Aexexxopbi cnexxpOMexpa B
AHanasoHe yxnoB 27-135°. ^exexxopu cnexxpoMexpa pacnonoxenbi no yrny
pacceBHHB HepaBHOMepno: no naxb AexexxopoB b HefixpoHOBOAC nepea »5°
(xa6jmpa). B coccahhx HenxpOHOBOAax MeHCAy xpaiiHHMH AexexxopaMH HMeexca
npoMexyxox b %20°, hxo b pjme cjiynaeB orpaHHHHBaex BbiGop ycnoBHH
HSMepeHHH. flexexxop, b cboio onepeAb, cocxohx m3 3 ccxahh c yrnoBbiM
paccxoflHHeM b 1,4° MOKAy hhmh, x.c. b xa^AOM HefixpOHOBOAe HMeexca no 15
H63aBHCHMbIX CeXIJHH, paCnOJIOMGHHblX npaXXHH6CXH C paBHOMepHbIM UiaXOM no
yrny pacceflHMfl.
2
1.2. npH n3MepeHHHX Bnanane npoeo/iHJiacb opneHTHpoBKa KpHCTajiiia,
onpeAenanca napaMexp pemeTKM; h oneHMBanacb MoaaHHHoexb o6pa3ua. J\nsi
3XOIX) CHMMajlCfl pOTOp-MOHOXpOM3TOp CHCHTpOMeTpa H H3MepflJlHCb
flH(f)paKUMOHHbie cneKTpbi.
Mo3aHHHOCTb MOHOKpMcxanna HHoGna cocxasnana okojto A@=30\ hxo
npHMepHO cooTBeTCTByeT yrnoBon pacxoAHMocxn nynna pacceaHHbix HefixpoHOB
Ana oahoh ceKUHH aeTeKTopoB, no3TOMy AononHMxenbHaa KonnHMauwa nyMKa He
npoBOAMJiacb.
1.3. ripH H3MepeHHsx AHcnepcwoHHbix xpHBbix Ha cneRTpoMerpe no BpeMeHH
nponexa npaMOH reoMexpHH ycnoBHa H3MepeHHH oGbiHHO BbiGwpaioxca xaK,
HXoGbl BOJ1HOBOH BCKTOp paCCCflHHblX HCHXpOHOB k COBHa^aJI C OAHHM H3
HanpaejieHHM oGpaxHon pewexKH, He npoxoAamHM nepea yaen (000) (pnc.l).
OaHBKO ^Jlfl KOHKpeTHOrO CneKipOMCTpa H3 MHOHteCTBa T3KHX HanpaBJICHHM
TOJIbKO AJia HeCKOJlbKHX H3 HMX yCJlOBHfl H3MepeHMH GyAyT nOAXOAflLUMMM no
HHTeHCHBHOCTM HOTOKa HCHXpOHOB H pa3peiiieHMK). J\]IB BblGpaHHOXO
HanpaBJieHHB [hkl] senHHMHa m HanpasneHHe bojihobofo seKTopa na^aroinnx
HeHTpoHOB ko onpeAenatoxca reoMerpHeH oGpaxHOM pemexKM m BbiGpanHbiM
yrnoM pacceamia cneicxpoiviexpa 0.
J\jib HanpaBJieHHfl [111], npoxoAamero nepe3 ysen (110) b nnocKOcxn (110)
oGpaTHon peineTKH, 3HaneHMa ko h HanajibHon sneprHH HetixponoB E0 npHBe^eHbi
b xaGnwpe Ana MenxpajibHbix cckuhh AexexxopoB. Ha AaHHbix bmaho, hxo
HaHaubHbie aHeprwH HetixpoHOB naxoAaxca b paGonew AHanaaone anepxHH
cnexxpoMexpa ^HH-2F1H. Eonee xoro, xaioKe soaMoacHbi H3MepeHHa b
GJieAyiomeH 3one Epmuitoana c bojihobbimh BeKxopaMH ko*~2k0. KorAa Bexxop k
coBnaAaex c HanpaBJieHHCM [111], npoxoAamHM nepea yaen (220) (noKaaano
nyHKXHpoM Ha pHC.l). CneAyex oxMexwxb, hxo Ana nanpaBJieHHH [111] n [11-1]
oGpaxHOH peuiexKM npw oahom h xom ace yrne pacceaHHa n BenHHHHe seKxopa k0,
ho Ana oxnHwaiouaMxca Ha yron 180-a opMeHxaunn Kpncxajina, n3MepeHwa Aatox
paanwHHbie (])OHOHbi. Tbkhm oGpaaoM, Ana Kpwcxanna HwoGwa npn
HcnojibaoBaHHH onHcaHHoti mcxoahkm na cneKxpotviexpe /)HH-2HH oGmee nucno
3
H3MepeHMH, B KOTOpbIX AOJDKHbl HaGjHOAaXbCfl pa3JlHMHbie 4>OHOHbl B
HanpaBjieHMM [111], AocxHxaex 180. J\sta HanpaBJieHHti [100] h [110] hmcjio
pa3JiH4Hbix BapwaHTOB yMeHbiuaeTCfl MHHHMyM b 2 pa3a HJ-3a roro, hto yroji a
cocxaBjiflex 90°, x.e. npH M3MepeHH«x baojib, HanpHMep, [100] h [010] 6yAyx
HaGmoAaTbCH oahh h re )xe (})OHOHbi. KpOMe xoro, b nocneAHCM cjiynae
H3MepeHHB npn ko*=2ko b paAe cjiynaes GyAyx orpaHHHHBaxbca HHxeHCHBHOcxbio
HefixpoHOB h pa3peujeHHeM cnexxpOMexpa.
1.4. /Xtih onTHMaiibHoro BbiGopa ycjiOBHH H3MepenHH hcoGxoahmo hmctb
HCKOTOpyK) npeABapHTCJIbHyK) HH([)OpMaAMK) O AMCnepCMOHHblX KpHBbIX
HccneAyeMoro seiAecxsa. TorAa aji* BbiGpaHHoro HanpaBJieHHH [hkl] b oGpaxHOH
pemexxe h 3aAaHHbix reoMexpHefi cnexxpOMexpa yrjiOB pacceaHna mo»ho
nocxpoMXb 3aBMCHMOcxH s(Qhki) ~ ((Qhki+k/)2-k02)/2m h ficos(Qhk/) =
dficoj (q+27rr)hkl), XAe Qhk, - bojihoboh Bexxop B AO Jib HanpasjieHHfl [hkl], a
BejiMHHna kf onpeAeJiflexcfl BbiGopoM Hanaiia KOOpAMHax. nepeceneHHfl 3xhx
KpHBbIX GyAyX COOXBeXCXBOBaXb OAHOBpeMCHHOMy BblHOJIHeHHK) yCJIOBHH
COXpaHCHHB 3HeprHH H HMHyjIbCa npH paCCeflHMH, X.e. nOK33bIBaXb (f)OHOHbI,
HaGjiiOAaeMbie b ashhux SKcnepHMeHxajibHbix ycjiOBHflx.
TaKHe 3aBHCHMOcxH mojkho nocxpoHXb AA% ecex AexeKXopoa h noMecxHXb na
oahh rpacJjHx, Koxopbiti 6yAex noxa3biBaxb see c|)OHOHbi, Koxopbie mojkho
H3Mepwxb jxna 3aAaHHoro HanpaBJieHHH [hkl]. Ha pwc.2 npHseACHbi rpa<])HKH
3aBHCHMocxeH etQhkil^T)2((Qhk&kff-ko h ficos(Qhk!)=±fict)J(q+27rT)hki
AJifl KpHcxajuia hhoGhh aha HanpaBJieHHH [111], upoxoAAmero nepea yaeji (110)
(oAHOMy H3MepeHHK> cooxBexcxsyex oah3 napaGojia Ha rpa^Hxe).
/(McnepcHOHHbie xpHBbie T)cos(Q) paccHHXbiBajincb b moacjih oGoGiAeHHbix chji
B33HMOACHCXBHH C yMCXOM BOCbMH KOOpAHHaiJHOHHblX C^)6p. Hcn0Jlb30B3JIHCb
KOHcxanxbi H3 paGoxbi [5].
JIhhmm 3aBHCHMOGXH e(Q) oGpaxyiox xpn rpynnbi (nojiocbi), xajKAyto M3
Koxopbix ohm 3anojiHflK>x npaKXHHecKH paBHOMepHO. PaapbiBbi Me)KAy nojiocaMH
oGycjiOBJienbi KOHCxpyxuHeH cnexxpOMexpa. Jlesafl nonoca cooxBexcxsyex yrnaM
0=27-49°, cpeAHHfl 0=70-92°, h npasafl 0=113-135°. Rax y>xe oxMeMajiocb ,
4
ycjiOBHfl H3MepeHHH fljifl BbiSpaHHoro HanpaBJieHHH [111] onTHMajibHbi no
MHTeHCHBHocTH h pa3peuieHHK) cnexxpoMexpa pjix Bcex yrjioB pacceaHHfl. Kax
BMflHO M3 pwc.2, b pa3JiHHHbix M3MepeHHflx MHCJio nepeceneHHH flHCnepCHOHHblX
KpHBbix h napaGoji e(Q) (hhcjio HaGmoAaeMbix 4>ohohob) MewiexcB ot AByx ao
rnecTH. MHHHMajibHbiH war no Q npw H3MepeHHH AHcnepcHOHHbix KpHBbix
onpeflejwercfl KpHBbiMH e(Q) fljw coce^HHx cexijHH (xpHBbie ajm Bcex cexpHH
Aexexxopos noKasanbi na p«c.2 nyHKTHpOM xojibxo ajw xpafiHHX AexexxopoB b
HeHTpOHOBoyax, aha ocxajibHbix npHseAenbi xojibxo ajm peHxpajibHbix cexijHH).
TaxHM o6pa30M, npn H3MepeHHflx baoab paccMaxpHBaeMoro nanpaBjieHHa moxcct
6bixb nojiynena AexajibHan HH^opMapHU o npoAonbHOM (L) h nonepenHOH (T)
BCTBflX AHCnepCHOHHbIX XpHBbIX npaXTHMCCKH AJ1« BCCX BOJIHOBbIX BCXXOpOB
4>ohohob, xpoMe oGjiacxw bGjihsh q/qm-0,5 (b6jih3h tohxh P). Tcm ne Menee
GoJIbWOH Bbl6op pa3JIHMHbIX BapHaHTOB H3MepeHHH AJM HanpaBJieHHB [111]
no3BOJwer npeAnojiaraxb, hto AHcnepcHOHHbie xpHBbie hhoGhb Moryx Gwxb
AexaJibHo H3MepeHbi bo bcch oGabcxh bojihobhx Bexxopos (Jjohohob. /[jib
HanpaBjieHHH [100] h [110], OA»axo, bo3mo5khm ynacxxH AHcnepcHOHHbix xpHBbix,
xoxopbie He Moryx 6bixb noApoGno H3Mepenbi npH Hcnojib30BaHHH Aannoro
MexoAa. B 3xom cjiynae mo>kho npHMCHHXb Apyrne mcxoabi H3MepeHHH, b
xoxopbix ycjioBHH 3xcnepHMeHxa, cxopee scero, GyAyT noAGwpaxbCB ajib
H3MepeHHB xonbxo OAHoro 3aAaHHoro (])OHOHa.
2. SKcnopuMeHmaJibHbie po3yjibmambi
2.1. 3xcnepHMeHxajibHbiH cnexxp pacceaHHbix HeiixpoHOB npH opHeHxaunH
HanpaBJieHHB [111] xpHCxajuia na yron pacceBHHB 0=119,07° h HanajibHOH
3HeprHH HeAxpoHOB Eo=6,54 msB noxaaaH na pnc.3. Bojihoboh sexxop
pacceaHHbix HeiixpoHOB npH 3xhx ycnOBHBx coanaAaex c HanpaBJieHweM [111],
npoxoABWHM Hepes ysen (110).
B cnexxpe npncyxcxByiox nwxH cooxsexcxByioiAMe OAHO(})OHOHHOMy
paccenHHio c poncACHHeM h yHHHxoMteHHeM (j)OHOHa. HaGmoAaeMbie 4>°hohm
noxaaanbi na pHc.2 xonxaMH h h3xoa»tcb Ha xpHBOH e(Qhki) -fi2((Qhki+kf)2-
5
kg)/2m fljia yrjia 1 19,07°. Hhcjio Ha6jnoAaeMbix ({iohohob h hx 3HeprHH
cornacyioTCfl c npHBeAeHHbiMH Ha pHc.2 pe3ynbxaxaMH npeAsapHxejibHbix
pacneroB. Hexoxopbie cabmph b nojioxceHHflx (|)ohohob no cpasHeHnio c
pacnerHOH xpHBOH T)0}s(Qhkl)=df\a>s((q+2nr)hki CBjnaHbi c HexonHOcxbio moacjih.
OcTajibHbie tohkh na phc.2. cooTBercTByioT (^OHOHaM, HaGjiiOAaeMbiM npn
HacxpoHKe na Apyrae Aexexxopbi (0=71,3° h 123,9°).
2.2. HpeACTaBJweT HHxepec cpaBHeHHe nojiyneHHbix pesyjibTaiOB c
HMeiOIAHMHCB 3XCnepHMeHXaJIbHbIMH AaHHbIMH no HH06hK), H3MepeHHbIMH Ha
TpexxpHCTajibHOM cnexxpOMexpe Ha peaxxope roctoahhoh moiahocth [5,6]. Kax
bhaho H3 phc.4, pesyjibxaTbi, nojiyneHHbie na cnexxpOMexpe J\WW-2Y\Wy xopomo
cornacyioxcB c sxhmh AaHHbiMH. OueneHnafl oniH6xa nacxox (])ohohob, xax
npasHJio, He npeBbimaex paswepos xohxh Ha rpa(|)Hxe. Cneuyer oxMexnxb, hxo
pacuinpeH AHanasoH sxcnepHMenxajibHbix AaHHbix: onpeAejieHbi nacxoxbi
HH3XOH3CXOXHbIX (|)OHOHOB C BOJIHOBbIMH BCXXOpaMH #<0,1 5. B ACJIOM
pesyjibxaxbi H3MepeHHH na cnexxpOMexpe ^HH-2FIH AeMOHCxpHpyiox xopomne
B03M05KH0CXH JUIR H3MepeHHH AHCnepCHOHHbIX 33BHCHMOCXeH (|)OHOHOB.
2.3. Tlocxonbxy cnexxpoMexp ^HH-2HH MHoroAexexxopnafl ycxanoBxa, xo
OAHOBpeMeHHO co cnexxpoM na Aexexxope, ww xoxoporo HanpaBjieHHe sexxopa
k coanaAaex c [110], H3Mep*noxcfl cnexxpbi aji» ApyrHx yrnos pacceflHHfl. Ha
Phc.5. npHBCAeHbi cnexxpbi paccesHHbix HeHxpoHOB,Ha6jiK>AaeMbie na pasjiHHHbix
yrnax pacceflHHfl, xorAa sexxop k coanaAaex c HanpasjieHHeM [110] npn
6*=119,07°. Cnexxpbi cnnbHO n3MeHflioxcfl c yrnoM pacceflHHB, ocoGeHHO
()>OHOHHbie hhxh npn Majibix nepeAanax sneprHH. ^HarpaMMbi pacceaHHH jym
3xhx cnexxpOB noxasaHbi na pnc.6. M3 pHcynxa bhaho, hxo nexoxopbie (JjOHOHbi
Moryx 6bixb Ao6aBJieHbi x HMeioiAHMca AaHHbiM no AHcnepcHOHHbiM
33BHCHMOCXHM B CHMMCXpHHHblX HanpaBJICHHEX, HO, X3X np3BHJIO, BOJIHOBbie
Bexxopbl (})OHOHOB H6 JIOKaX B CHMMCXpHHHblX HanpaBJICHHBX. B npHHUHne, see
H3MepaeMbie c|)OHOHbi Moryx 6bixb Hcnonb30BaHbi aa* anajinsa AHHaMHHecxHx
xapaxxepncxHx. Oahexo yme npn ananHse npocxoro cjiynaa HHSxonacxoxHbix
6
(|)ohohob b 3one EpHJUiK)3Ha c ueHTpoM b y3jie (110) (pHC.6), TpcGyiOTCfl pacneTbi
HHTeHCMBHOCTH OAHOfjjOHOHHOTO paCCCflHHfl AJIfl OnpeACJlCHHA HHZieKCa
nOJlflpHiaUMH (|)OHOHOB. Ha CJIOJKHOCTb aH3JlH3a (})OHOHOB B HeCHMMeTpHHHbIX
HanpaBJieHHflx, ocoGchho b KpncTajuiax co cjiojkhoh crpyKTypofi, o6pamajiocb
BHHMaHwe b paGoxe [TJ. Tcm He Menee cnpaBeAJiHB bbiboa paGoibi [7] o tom, hto
AJifl npocTbix crpyKTyp HcnojibTOBaHHe Been nojiynaeMOH b 3KcnepHMeHTe
HHt^opMauHH npeACTaBJiflercfl B03M0>KHbiM. TaKHe AaHHbie no3BOJiflK)T npoBepsTb
TOHHOCTb AHHaMHHeCKOH MOACJIH GOJICC HOJIHblM 06p330M. OaH3KO B HaCTOflLUee
BpeMfl anajiHS c|)ohohob b HecHMMeTpHHHbix HanpaBJieHHflx, nojiyneHHbix Ha
cneKTpoMerpax no speMCHH npojiexa, He hpoboahtca.
Bbieodbi
1. J%jifl cjiynaa hhoGha npOBCAen aHajiH3 SKcnepHMeHTajibHbix bosmokhoctch
cneKTpoMerpa /%HH-2HM min H3MepeHHH AHcnepcnoHHbix saBHCHMOcxen
(f)OHOHOB. nOKa33HO, HTO AHCnepCHOHHbie 33BHCHMOCTH (J)OHOHOB MOTyT
6biTb AexanbHO H3MepeHbi ajih BbiGpaHHoro HanpaBJieHHfl bojihoboto
BCKTOpa.
2. Pe3yjIbT3TbI H3MepeHHH AHCnepCHOHHbIX KpHBbIX B HanpaBJieHHH [111] B
hhoGhh, nojiyneHHbie Ha cneKTpoMexpe /(MH-2HH, xopomo comacyioTCfl c
H3BeCTHbIMH 3KCnepHMeHT3JlbHblMH AaHHbIMH, H3Mep6HHbIMH H3
TpeXKpHCTaJIbHOM CneKTpOMCTpe.
3. OAHOBpeMCHHO c HH(|)opMauHeH o (J)OHOHax b sapanee BbiGpaHHbix
HanpaBJieHHflx b H3MepeHHflx nojiynen Gojibinofi oGbcm AaHHbix no c])OHOHaM
b HecHMMeTpHHHbix HanpaBJieHHflx. Tanwe AaHHbie AaiOT botmohchoctb
npOBepHTb TOHHOCTb AHH3MHHeCKOH MOACJ1H GojlCC HOJIHblM 06p330M,
OAH3KO MX aH3JlH3 TpeGyCT p33BHTMfl CneAHaJlbHblX MCTOAHK.
ABTopbi BbipaxaiOT GjiaroAapHOCTb Mhpohoboh F.M. 3a CTHMyjinpyiomHe
oGcyjKAGHHfl H Mopososy B.M. 3a noMomb npw npoBCAeHHH H3MepeHHH Ha
cneKTpOMexpe /(HH-2FIH.
7
Ta6nui4a
BojiHOBbie BeKTopbi h HaHa/ibHbie 3Heprwn HeHTpOHOB b saBHCMMOCTH ot ynia pacceflHHB ajih nanpaBJieHHfl [111], ripoxoAHinero nepe3 y3eji (110) (pnc. 1) (aaHHbie npHaeACHbi tojibko njix uenTpaubHbix ccklimm AgreKTopoB)
Nneinp /Nflei 0, rpafl. to, A'1 E0, M3B
1/1 133,693 2,150 9,579
1/2 128,817 1,995 8,250
1/3 123,937 1,873 7,276
1/4 119,071 1,778 6,556
1/5 114,213 1,704 * 6,021
2/1 90,674 1,554 5,009
2/2 85,805 1,559 5,035
2/3 80,944 1,574 5,135
2/4 76,092 1,601 5,315
2/5 71,248 1,641 5,585
3/1 47,633 2,104 9,174
3/2 42,775 2,289 10,859
3/3 37,933 2,528 13,2529
3/4 33,081 2,848 16,810
3/5 28,225 3,287 22,391
8
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1. 3.MajwLiieBCKM, T.A.MaMexHHa m Ap. OpenpHHT OH.HH PI4-4270, ^y6na,1969.
2. S.KrasnicKi, A.Wanic et al Preprint JINR E14-5987, Dubna, 1971.
3. B.r.JlH(})opoB, A.F.Hobhkob h Ap. LIpenpHHT <t>3H-129, 06hhhck, 1968.
4. User Guide, Neutron experimental facilities at JINR, Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, 1992, p.24.
5. Y.Nakagawa, A.D.B.Woods Phys.Rev.Lett., 1963, v.l 1, No.6, p.271.
6. B.M.Powel, A.D.B.Woods, P.Martel Neutr. Inelast. Scatt., 1972, Proc. of Symp. on Neutr. Inel.Scatt., IAEA, Grenoble, France, 6-10 March 1972, IAEA, Vienna, 1972, p.43-51.
7. B.Dorner J. of Neutron Research, 1994, vol.2, No.3, p. 115.
PyKoimcb nocTymuia b HsaarejibCKHii otacji 27 (jicepana 1997 ro.ua.
15
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Coo6iuchhc O&bejiHHCHHoro HHCTHTyra aaepubix HCcneaoBamiH. HyGua, 1997
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Danilkin S.A., Jadrowskij E.L. PI4-97-64Phonon Dispersion Curves in Nb Measuredwith DIN-2PI Time-of-Flight Spectrometer at IBR-2 Reactor
The phonon dispersion curves in niobium were measured with direct geometry neutron spectrometer DIN-2PI. The data derived are in agreement with known dispersion curves obtained using the triple-axis spectrometer. The experimental capabilities of the time-of-flight neutron spectrometer are analyzed for the measurements of the phonons in desired symmetry direction. The experimental results and calculations show the good possibilities for the detail phonon dispersion measurements with multidetector DIN-2PI spectrometer. Simultaneously with phonons with wave vectors in desired direction a large number of phonons in non-symmetry directions were derived.
The investigation has been performed at the Frank Laboratory of Neutron Physics, JINR.
Communication of the Joint Institute for Nuclear Research. Dubna, 1997
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Twpaac 300. 3axa3 49835. UeHa 2052 p.
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