ᑄ᫈ၮḰߣߩᲧセ

ᣣᧄࠕࠗ࠰࠻࡯ࡊදળߩᑄ᫈ၮḰߢߪޔ࿁෼ኈེ1ᧄ㧔 50 l 㧕޽ߚࠅޔ✚㊂ߢ400 MBqߣߥ ߞߡ޿ࠆ[5]ޕ੹࿁ߩ࿁෼ᠲ૞෸߮ടᾲឃ᳇ߦࠃࠆ㒰ᨴߢߪ457 kBq/g߹ߢ㒰ᨴߔࠆߎߣ߇ߢ߈ߚ ߎߣ߆ࠄ㧘੹࿁⊒↢ߒߚ࠲ࡦ࠲࡞✢ߩᑄ᫈‛ߩ✚㊂㧘1.2335 g ߢߪ564 kBq ߣߥࠅ㧘࿁෼ኈེߦ ᑄ᫈น⢻ߦߥߞߚߣ⸒߃ࠆޕ

৻ᣇ㧘ࠗࠡ࡝ࠬߦ߅ߌࠆૐ࡟ࡌ࡞᡼኿ᕈᑄ᫈‛㧔β ᩭ⒳㧕ߩၮḰߣᲧセߒߡߺࠆߣ[6]㧘ߘߩၮ Ḱ㧔Low Level Waste : LLW㧕ߪ12 MBq/kgߢ޽ࠆޕ੹࿁ߩ943 Kߢ3.5ᤨ㑆଻ᜬߣ޿߁᧦ઙߢߩ㒰

ᨴߢߪޔ457 MBq/kg߹ߢ㒰ᨴߢ߈ߚ߇㧘ߎߩၮḰࠍḩߚߔߦߪᦝߦ1/40⒟ᐲ㒰෰ߔࠆᔅⷐ߇޽ࠆޕ

හߜ㧘ᦝߦ㜞᷷㧘㐳ᤨ㑆ߩടᾲឃ᳇㧘޽ࠆ޿ߪઁߩᣇᴺࠍᬌ⸛ߔࠆᔅⷐ߇޽ࠆߣ⠨߃ࠄࠇࠆޕ଀

߃߫㧘ᢥ₂[6]ߢ␜ߐࠇߡ޿ࠆࠃ߁ߥ㧘᳓⚛ߦࠃࠆห૏૕੤឵෻ᔕࠍ↪޿ߚ㒰ᨴ߽᦭ലߢ޽ࠆߣ⠨

㪇 㪉 㪋 㪍 㪏 㪈㪇 㪈㪉 㪈㪋 㪈㪍 㪈㪏

㪇 㪈 㪉 㪊 㪋 㪌

㪫㪸㩿㪣α㪀 㪫㪸㩿㪤α㪀

㩷

㩷

㪚㫆㫌㫅㫋㫀㫅㪾㩷㫉㪸㫋㪼㪃㩷㪥㩷㪆㩷㪺㫆㫌㫅㫋㫊㩷㫄㫀㫅㪄㪈㩷㩿∆㪜㪀㪄㪈

㪜㫅㪼㫉㪾㫐㩷㫆㪽㩷㪯㪄㫉㪸㫐㫊㪃㩷㪜㩷㪆㩷㫂㪼㪭

㩷㪦㪹㫊

㪘㫉㩿㪢α㪀

㪙㪸㪺㫂㪾㫉㫆㫌㫅㪻

㪇 㪉 㪋 㪍 㪏 㪈㪇 㪈㪉 㪈㪋 㪈㪍 㪈㪏

㪇㪅㪇 㪇㪅㪌 㪈㪅㪇 㪈㪅㪌 㪉㪅㪇

㪫㪸㩿㪣α㪀 㩷

㩷

㪚㫆㫌㫅㫋㫀㫅㪾㩷㫉㪸㫋㪼㪃㩷㪥㩷㪆㩷㪺㫆㫌㫅㫋㫊㩷㫄㫀㫅㪄㪈㩷㩿∆㪜㪀㪄㪈

㪜㫅㪼㫉㪾㫐㩷㫆㪽㩷㪯㪄㫉㪸㫐㫊㪃㩷㪜㩷㪆㩷㫂㪼㪭

㩷㪦㪹㫊㪅

㪙㪸㪺㫂㪾㫉㫆㫌㫅㪻 㪘㫉㩿㪢α㪀 㪫㪸㩿㪤^α㪀

10 ߃ࠄࠇࠆߚ߼㧘੹ᓟߩ⺖㗴ߣߒߚ޿ޕ

4. ߹ߣ߼

੹࿁㧘㜞Ớᐲߩ࠻࡝࠴࠙ࡓߢᳪᨴߐࠇߚ࠲ࡦ࠲࡞✢߆ࠄߩ࠻࡝࠴࠙ࡓߩ࿁෼߅ࠃ߮㒰ᨴࠍ⹜ߺߚޕ

13.3GBq ߩ࠻࡝࠴࠙ࡓࠍๆ⬿ߒߚ࠲ࡦ࠲࡞✢ࠍടᾲߔࠆߎߣߢ11.7 GBqߩ࠻࡝࠴࠙ࡓࠍ࿁෼ߒ㧘

ߎࠇߪๆ⬿ߒߚ࠻࡝࠴࠙ࡓ㊂ߩ87.8%ߦ⋧ᒰߔࠆޕ943 Kߢ3.5ᤨ㑆ടᾲឃ᳇ߔࠆߎߣߢޔᱷሽ࠻

࡝࠴࠙ࡓ㊂ࠍ564kBq߹ߢ㒰ᨴߔࠆߎߣ߇ߢ߈ߚޕߎߩᱷሽ࠻࡝࠴࠙ࡓ㊂ߪๆ⬿ߒߚ࠻࡝࠴࠙ࡓ㊂

13.3 GBqߩ0.004 %ߦ޽ߚࠅ㧘࿁෼⚳ੌᓟߩ࠻࡝࠴࠙ࡓ㊂1.6 GBqߩ0.04 %ߢ޽ࠆޕ߹ߚ㧘ߘߩ

࠲ࡦ࠲࡞✢ࠍ᳓ᶐẃߔࠆߎߣߢᱷሽ࠻࡝࠴࠙ࡓ㊂ߩ⚂ 37㧑ࠍ㒰ᨴߔࠆߎߣ߇ߢ߈ߚޕBIXS ࠬࡍ

ࠢ࠻࡞ࠃࠅޔടᾲߦࠃࠆ㒰ᨴߢߪౝㇱߩ࠻࡝࠴࠙ࡓࠍ㒰෰ߔࠆߎߣ߇ߢ߈㧘᳓ᶐẃߢߪ࠲ࡦ࠲࡞

✢⴫㕙ߩ࠻࡝࠴࠙ࡓࠍᦝߦ㒰෰ߢ߈ߚߎߣ߇⏕⹺ߐࠇߚޕ᳓ᶐẃࠍⴕߞߚ࠲ࡦ࠲࡞✢ࠍ⚂212ᣣ 㑆ⓨ᳇ਛߢ଻▤ߔࠆߎߣߦࠃߞߡޔ࠻࡝࠴࠙ࡓߩౝㇱಽᏓ߇ടᾲߦࠃࠆ㒰ᨴࠍⴕߞߚ⋥ᓟߣหߓ ࠃ߁ߥ⁁ᘒߦߥࠆߎߣ߇⍮ࠄࠇ㧘଻▤ߦ㓙ߒߡᵈᗧ߇ᔅⷐߢ޽ࠆޕ

ᣣᧄߩᑄ᫈ၮḰߣᲧセߔࠆߣ㧘චಽߦᑄ᫈น⢻ߥ࡟ࡌ࡞߹ߢ㒰ᨴࠍⴕ߁ߎߣ߇಴᧪ߚޕߒ߆ߒ㧘 ᣣᧄߩၮḰࠃࠅ߽෩ߒ޿ࠗࠡ࡝ࠬߩૐ࡟ࡌ࡞᡼኿ᕈᑄ᫈‛ߩၮḰߣᲧセߔࠆߣ㧘㒰ᨴߪචಽߢߪ ߥ߆ߞߚߚ߼㧘ߐࠄߥࠆ㒰ᨴᣇᴺߩᬌ⸛߇ᔅⷐߢ޽ࠆޕ

੹࿁ߩ੐଀߇⿠ߎߞߚߩߪ㧘ታ㛎߇ᆎ߹ࠆ߹ߢߦ࠲ࡦ࠲࡞߇หᤨߦኽ౉ߐࠇߡ޿ࠆߎߣࠍ࠮ࡦ

࠲࡯ߩᜂᒰ⠪߇⍮ࠄߐࠇߡ޿ߥ߆ߞߚߚ߼ߢ㧘ታ㛎⠪෸߮࠮ࡦ࠲࡯ᜂᒰ⠪㑆ߩᛂߜวࠊߖߩਇ⿷

߇ේ࿃ߢ޽ࠆޕ੹ᓟߎߩࠃ߁ߥ੐଀ࠍ⿠ߎߐߥ޿ߚ߼ߦ߽㧘౒ห⎇ⓥࠍⴕ߁㓙ߪታ㛎⠪ߣ࠮ࡦ࠲

࡯ᜂᒰ⠪㑆ߩᛂߜวࠊߖࠍ⃻࿷ࠃࠅ߽✕ኒߦⴕߥߞߡ޿ߊᔅⷐ߇޽ࠆޕ

ෳ⠨ᢥ₂

[1] M. Matsuyama and K. Watanabe: Fusion Eng. Des. 18 (1991) 91

[2] M. Matsuyama, T. Murai, K. Yoshida, K. Watanabe, H, Iwakiri and N. Yoshida J. Nucl. Mater.

307-311 (2002) 729

[3] W. M. Mueller, J. P. Blackledge and G. G. Libowitz, (“Metal Hydrides”, Academic Press, 1968) [4] Y. Torikai, D. Murata, R.-D. Penzhorn, K. Akaishi, K. Watanabe, M. Matsuyama J. Nucl. Mater.

363-365 (2007) 462-466

[5] ᣣᧄࠕࠗ࠰࠻࡯ࡊදળ RIᑄ᫈‛ߩ㓸⩄ߦߟ޿ߡ:

http://www.jrias.or.jp/index.cfm/6,1633,c,html/1633/20070529_panfu.pdf

[6] A. N. Prevezentsev , A. C. Bell, J. Williams and P. D. Brennan Fusion Eng. Des. 83 (2008) 1364 [6] A. N. Prevezentsev , A. C. Bell, J. Williams and P. D. Brennan Fusion Eng. Des. 83 (2008) 1364

䊉䊷䊃㩷

㊄ዻ᳓⚛ൻ‛↪੤ᵹ⏛᧤⸘䈱᭴▽䈫䈠䈱ᕈ⢻⹏ଔ㩷

㩷

⿒ਣᖗ჻ޔጟ㦮࿻␭ޔේ ᱜᙗޔ᧻ጊ᡽ᄦ ንጊᄢቇ᳓⚛ห૏૕⑼ቇ⎇ⓥ࠮ࡦ࠲࡯

ޥ930-8555 ንጊᏒ੖⑔3190

㪚㫆㫅㫊㫋㫉㫌㪺㫋㫀㫆㫅㩷㫆㪽㩷㪘㫃㫋㪼㫉㫅㪸㫋㫀㫅㪾㪄㪚㫌㫉㫉㪼㫅㫋㩷㪤㪸㪾㫅㪼㫋㫆㫄㪼㫋㪼㫉㩷㪽㫆㫉㩷㪤㪼㫋㪸㫃㩷㪟㫐㪻㫉㫀㪻㪼㩷 㩷 㪸㫅㪻㩷㪠㫋㫊㩷㪧㪼㫉㪽㫆㫉㫄㪸㫅㪺㪼㩷㪫㪼㫊㫋㫊㩷

㩷

Satoshi Akamaru, Keisuke Okazaki, Masanori Hara, and Masao Matsuyama Hydrogen Isotope Research Center, University of Toyama, Gofuku 3190, Toyama

930-8555, Japan

(ReceivedNovember 21, 2011; accepted March 9, 2012) Abstract

An alternating-current magnetometer was assembled to measure the magnetic susceptibility of metal hydride in hydrogen atmosphere, and its performance tests were carried out. The magnetometer was designed to be integrated into the conventional pressure-composition-temperature (PCT) measurement system without any reconstruction. Calibration of the magnetometer was performed using a paramagnetic Gd₂O₃ powder, and it gave a linear relationship between the output signal and the magnetic moment of Gd₂O₃ powder. The magnetic susceptibility of PdH_x (0 ≤ x ≤ 0.7) was measured simultaneously with the PCT curve. The magnetic susceptibility of Pd hydride decreased with increasing hydrogen concentration in Pd and finally reached zero at the hydrogen concentration above 0.65. The behavior of magnetic susceptibility and PCT curves quantitatively agreed with the previously reported values.

1. ✜⸒

㊄ዻ᳓⚛ൻ‛ߪ᳓⚛⾂⬿᧚ᢱߣߒߡߩᔕ↪߇ᦼᓙߐࠇߡ߅ࠅޔᄙ⒳ᄙ᭽ߥ᧚ᢱ㐿⊒෸߮

ߘߩ᳓⚛ๆ෼᡼಴․ᕈߦ㑐ߔࠆၮ␆⎇ⓥ߇⋓ࠎߦⴕࠊࠇߡ޿ࠆޕ৻ᣇߢ㊄ዻ᳓⚛ൻ‛ߩ‛

ᕈ㧔㔚⏛᳇ޔᾲޔశ‛ᕈߥߤ㧕ࠍ೑↪ߒߚᔕ↪⎇ⓥ[1,2]߽ⴕࠊࠇߡ޿ࠆ߇ޔ᳓⚛⾂⬿᧚ᢱ㑐 ㅪߩ⎇ⓥߣᲧセߔࠆߣዋߥ޿ޕߘߩ৻ߟߩⷐ࿃ߣߒߡޔ㊄ዻ᳓⚛ൻ‛ߩ‛ᕈߦ㑐ߔࠆၮ␆

⎇ⓥ߇ዋߥ޿ߎߣ߇⠨߃ࠄࠇࠆޕ

㊄ዻߩ⏛᳇․ᕈߪޔฎߊ߆ࠄ᭽ޘߥᎿᬺ⵾ຠߦᔕ↪ߐࠇߡ޿ࠆޕ߹ߚޔ⃻࿷ߦ߅޿ߡ߽

⏛ᕈ᧚ᢱߩᕈ⢻ะ਄ࠍ⋡ᜰߒߚ㐿⊒⎇ⓥ߇ⴕࠊࠇߡ޿ࠆޕ᧚ᢱ㐿⊒ߩⷰὐ߆ࠄ⷗ࠆߣޔ㊄ ዻ᳓⚛ൻ‛ߪ⚿᥏ߩ᭴ㅧᄌൻࠍᒁ߈⿠ߎߔߎߣ߆ࠄޔ⏛᳇․ᕈߩ೙ᓮᚗ޿ߪᣂߚߥ․ᕈߩ

⊒⃻ߦ೑↪ߢ߈ࠆߣ⠨߃ࠄࠇࠆޕߒ߆ߒޔ㊄ዻ᳓⚛ൻ‛ߪ᳓⚛ๆ෼ߦࠃࠅᄙߊ߇ᓸ☳ൻߒޔ ᄢ᳇ਛߦขࠅ಴ߔ㓙ߦ⴫㕙㉄ൻߩᓇ㗀ࠍฃߌࠆߚ߼ޔ㊄ዻ᳓⚛ൻ‛ߦኻߔࠆ⏛᳇․ᕈߩᱜ

⏕ߥ᷹ቯ߇࿎㔍ߢ޽ߞߚޕ

ߘߎߢᧄႎ๔ߢߪޔ᳓⚛ๆ෼᡼಴․ᕈߩ⹏ଔߦ↪޿ࠄࠇߡ޿ࠆޔ࿶ജ-⚵ᚑ-᷷ᐲ․ᕈ 㧔PCT㧕᷹ቯⵝ⟎߆ࠄ㊄ዻ᳓⚛ൻ‛ࠍขࠅ಴ߔߎߣߥߊޔ᳓⚛ࠟࠬ㔓࿐᳇ਛߦߡޔ᳓⚛ൻ‛

ߩ⏛᳇․ᕈࠍ᷹ቯߔࠆߚ߼ޔPCT ᷹ቯⵝ⟎ߦኈᤃߦ⚵ߺㄟ߼ࠆ੤ᵹ⏛᧤⸘ߩ᭴▽ࠍⴕ޿ޔ ߘߩᕈ⢻⹏ଔࠍPd☳ᧃࠍ↪޿ߡⴕߞߚޕ

2. ੤ᵹ⏛᧤⸘ߩේℂߣⵝ⟎ߩ᭴▽

2.1. ⶄ⚛⏛ൻ₸

ߪߓ߼ߦ੤ᵹ⏛႐ਅߢߩ⏛ൻ₸ߦߟ޿ߡ◲නߦ⺑᣿ߔࠆ[3]ޕ⏛႐ߩᣇะ߇๟ᦼ⊛ߦᄌൻ ߔࠆ੤ᵹ⏛႐ਅߦ⹜ᢱ߇޽ࠆ႐วޔ⹜ᢱߩ⏛ൻ₸χ^(m3/kg)ߪⶄ⚛⏛ൻ₸χˆߣߒߡએਅߩࠃ ߁ߦ⸥ㅀߐࠇࠆޕ

χ χ

χˆ = ′− j ′′ ^…(1)

ߎߎߢޔj ߪ⯯ᢙන૏ࠍ⴫ߔޕ৻⥸ߦχ′ߪ⏛᳇ᔕ╵ߩ๟ᵄᢙଐሽᕈࠍ␜ߒޔχ′′ߪ⏛ᕈ૕ౝ

ߩ౒㡆࡮✭๺⃻⽎ߦࠃࠆ⏛᳇ᔕ╵ߩㆃࠇࠍ␜ߒߡ޿ࠆޕߥ߅ޔߎߎߢߪSI න૏♽㧔E-Bኻ ᔕ㧕ࠍ↪޿ߡోߡߩᑼࠍ⸥ㅀߔࠆޕ੤ᵹ⏛႐Hˆ (Am^-1)ਅߢߩ⏛ൻ₸χˆޔ⹜ᢱਛߩ⏛᧤ኒᐲ

Bˆ(Wb/m²)ޔ෸߮⹜ᢱߩ⾰㊂⏛ൻMˆ (Am²/kg)ߣߩ㑐ଥߪ㕒⏛႐ਅߢߩ㑐ଥߣᄌࠊࠄߕޔ

( )

^H

Bˆ 1 ˆ ˆ

0 χ

µ +

= ޔ Mˆ =χˆHˆ ^{…(2, 3)}

ߣߥࠆޕߎߎߢޔµ₀ߪ⌀ⓨਛߩㅘ⏛₸ࠍ␜ߔޕ੤ᵹ⏛႐Hˆ _{ߩⷺᝄേᢙࠍ}ω⁽²π/sec)ߣߔࠆ ߣޔHˆ _෸߮Bˆߪએਅߩࠃ߁ߦ⸥ㅀߐࠇࠆޕ

t H

Hˆ expω

= 0 ^…(4)

(

^{ω −δ}

)

=B t

Bˆ exp

0 …(5)

H0෸߮B₀ߪߘࠇߙࠇߩᝄ᏷ߩᄢ߈ߐߢ޽ࠅޔt^(sec)ߪᤨ㑆ߢ޽ࠆޕBˆ_{ߦ౉ߞߡ޿ࠆ}δ ߪޔ

H0߆ࠄߩ૏⋧ߩㆃࠇࠍ␜ߔޕ਄⸥ߒߚࠃ߁ߦޔ૏⋧ߩㆃࠇߪχ′′ߦ㑐ㅪߔࠆ㗄ߢ޽ࠅޔω߇ ዊߐߌࠇ߫δ ߪ߶߷0ߣߥࠆޕߟ߹ࠅߎߩ⁁ᴫਅߢߪޔχ′ߪ㕒⏛႐ਅߢߩ⏛ൻ₸χߣ৻⥌

ߔࠆߎߣ߇⍮ࠄࠇߡ޿ࠆޕ(2)-(5)ᑼࠍ↪޿ࠆߣޔχ′෸߮χ′′ߪએਅߩࠃ߁ߦ⸥ㅀߐࠇࠆޕ

(

^χ

) (

^ω_ω ^δ

) ( )

^δ

( ( )

^δ

( )

^δ

)

µ + = = − = exp − = cos − + sin − exp

ˆ exp ˆ ˆ

1

0 0 0

0 0

0 0 j

H B H

B t

H t B

H

B …(6)

1 cos

0 0

0 −

′= δ

χ µ

H

B …(7)

µ δ

χ sin

0 0

0

H

= B

′′ ^…(8)

ߟ߹ࠅޔχ′෸߮χ′′ߪ⹜ᢱਛߩ⏛᧤ኒᐲBˆ_{ߩ੤ᵹ⏛႐}Hˆ ߣหߓ૏⋧ࠍᜬߟᚑಽߣޔ90^oߛߌ

૏⋧ߩㆃࠇߚᚑಽࠍ᷹ቯߔࠆߎߣߢ᳞߼ࠆߎߣ߇ߢ߈ࠆޕ 2.2 ੤ᵹ⏛᧤⸘ߩේℂ

੤ᵹ⏛᧤⸘ߢߪޔ੤ᵹ⏛႐ਅߢߩ⹜ᢱਛߩ⏛᧤ኒᐲߩᄌൻࠍ࠰࡟ࡁࠗ࠼ࠦࠗ࡞߳ߩ⺃ዉ

⿠㔚ജߣߒߡᬌ಴ߔࠆޕߘߩේℂࠍએਅߦ⺑᣿ߔࠆ[4]ޕ੤ᵹ⏛႐⊒↢↪ߣߒߡ↪޿ࠆඨᓘaޔ 㐳ߐlޔ✢Ꮞ߈ᢙN1ߩਛⓨߩ࠰࡟ࡁࠗ࠼ࠦࠗ࡞1㧔࡝ࠕࠢ࠲ࡦࠬL1㧕ߦએਅߩ੤ᵹ㔚࿶Vˆ₁ࠍ ශടߔࠆޕ

t j V

Vˆ₁= ₀exp ω ^…(9)

V0ߪ੤ᵹ㔚࿶ߩᝄ᏷ߢ޽ࠆޕߎߩߣ߈࠰࡟ࡁࠗ࠼ࠦࠗ࡞1ߦᵹࠇࠆ㔚ᵹIˆ₁ߪޔ

( )

2

(

1

)

1 2 1

0 1

1 0 1

1 1 exp exp

ˆ

ˆ ˆ ω θ

ω ω

ω −

= +

= +

= j t

L R

V L

j R

t j V Z

I V ޔ …(10)

ૉߒޔ R

L₁

1 tan 1ω

θ = ^{− …(11)}

ߣߥࠆޕߎߎߢޔZˆ₁ߪ࠰࡟ࡁࠗ࠼ࠦࠗ࡞1ߩⶄ⚛ࠗࡦࡇ࡯࠳ࡦࠬޔR1ߪ࠰࡟ࡁࠗ࠼ࠦࠗ࡞

1ߩ㔚᳇ᛶ᛫ߢ޽ࠆޕߎߩ㔚ᵹIˆߦࠃࠅޔ࠰࡟ࡁࠗ࠼ࠦࠗ࡞1ߩ┵߆ࠄ〒㔌xߩ႐ᚲߦ⊒↢

ߔࠆ⏛႐Hˆ₁ߪޔⓨߩࠦࠗ࡞ਛߩ⏛᧤ኒᐲBˆ₁ࠃࠅએਅߩࠃ߁ߦᦠߌࠆޕ

( )

( ) ( )

2

(

1

)

1 2 1

0 2 2

2 2 1

2 2 2

2 1 0 1 1

2 exp 2

ˆ ˆ ˆ

θ ω ω

µ

+ −













− +

− −

= +













− +

− −

= +

=

t L j

R V x

l a

x l x

a x l

N

x l a

x l x

a x l

I N H B

…(12)

ߎߩ੤ᵹ⏛႐ߩਅߢ࠰࡟ࡁࠗ࠼ࠦࠗ࡞1ߩਛᔃㇱ㧔x = l/2㧕ߦⶄ⚛⏛ൻ₸χˆ₁ߩ⹜ᢱࠍኒߦߟ

߼ߚ႐วޔ⹜ᢱਛߩ⏛᧤ኒᐲBˆ_1inߪએਅߩࠃ߁ߦᦠ߈⴫ߐࠇࠆޕ

( )

( )

( )

2

(

1

)

2 1 1

0 2

1 2 0

1 1 0 1

4 exp ˆ 2

1 ˆ ˆ ˆ 1

θ ω ω

χ µ

χ µ

+ − + +

= +

=

t L j

R V l

a N H B_in

…(13)

ߎߩ⏛᧤ኒᐲߩᄌൻߦࠃࠅޔ࠰࡟ࡁࠗ࠼ࠦࠗ࡞1 ߦ㊀ߨߡᏎ޿ߚ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 2 ߦߪ એਅߩ⺃ዉ⿠㔚ജVˆ_{2in߇⊒↢ߔࠆޕ}

Coil 1

Coil 3

Coil 2

Lock-in Amplifier

Pd powder TMP

H₂ RP gas

Fig. 1. Schematic view of alternating current susceptometer and conventional PCT measurement system.

( )

( )

( )

^{ − − }

+ +

− +

=

−

=

exp 2 4

exp 2 1 ˆ

ˆ ˆ

2 1 2 1

1 0 2

2 1 0

2 1 2

θ π ω ω

ω δ µ

χ j t

L R

V l

a j NS dt

B S d

V_in ⁱⁿ

…(14)

ߎߩᑼߪవ㗡ߩ᜝ᒐਛߩੑߟߩ㗄ߦಽߌࠄࠇޔ೨ߩ㗄ߪ੤ᵹ⏛႐߇⿠ߎߔ㧔⹜ᢱ߇ή޿႐ วߩ㧕⺃ዉ⿠㔚ജޔᓟߩ㗄ߪ⹜ᢱਛߩ⏛᧤ኒᐲߩᄌൻߦ⿠࿃ߒߚ⺃ዉ⿠㔚ജߣߥߞߡ޿ࠆޕ ߎࠇࠃࠅޔ⹜ᢱࠍ⹣߼ߚ㓙ߩ⺃ዉ⿠㔚ജ߆ࠄޔ⹜ᢱ߇ή޿႐วߩ⺃ዉ⿠㔚ജࠍᒁߊߎߣߦ ࠃࠅޔ⹜ᢱߩⶄ⚛⏛ൻ₸ߩᄢ߈ߐχˆ₁ ෸߮૏⋧ߩߕࠇδ 㧔ᚗ޿ߪχ′෸߮χ′′㧕ߦ㑐ߔࠆᖱႎ ࠍᓧࠆߎߣ߇ߢ߈ࠆޕ

2.3 ੤ᵹ⏛᧤⸘ߩ᭎ⷐ

᷹ቯⵝ⟎ߩ᭎⇛ࠍ࿑ 1 ߦ␜ߔޕ࿑ਛߩ⎕✢ߢ࿐߹ࠇߚㇱಽ߇ޔ੹࿁᭴▽ߒߚ੤ᵹ⏛᧤⸘

ߢ޽ࠅޔߘߩઁߩㇱಽߪᣢሽߩPCT ᷹ቯⵝ⟎ߢ޽ࠆޕ੤ᵹ⏛᧤⸘ࠍᣢሽߩ᳓⚛ๆ෼᡼಴᷹

ቯⵝ⟎ߦ⚵ߺㄟ߻㓙ߪޔ⹜ᢱ▤એᄖߪⵝ⟎ߩᡷㅧࠍᔅⷐߣߒߥ޿ޕ߹ߚޔ੤ᵹ⏛᧤⸘ߣPCT

᷹ቯⵝ⟎ߪ੕޿ߦ⁛┙ߦ૶↪น⢻ߢ޽ࠆޕ

੤ᵹ⏛᧤⸘ߪ੤ᵹାภ⊒ାᯏ㧔DF1906, NF ࿁〝⸳⸘ࡉࡠ࠶ࠢ㧕෸߮ࡠ࠶ࠢࠗࡦࠕࡦࡊ 㧔Model 5210, SEIKO Instruments㧕ޔߘߒߡౝᓘ8 mmޔᄖᓘ10 mmߩ⍹⧷▤ߦᏎ޿ߚ3ߟ ߩ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ࠃࠅ᭴ᚑߐࠇࠆޕ࿑ 1 ਛߦ⸥タߒߚ੤ᵹ⏛᧤⸘ߩ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ߩ ߁ߜޔᏀ஥ߩ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 1 ߇੤ᵹ⏛႐⊒↢↪ߢ޽ࠅޔฝ஥ߩ 2 ߟߩ࠰࡟ࡁࠗ࠼ࠦࠗ

࡞2ޔ3߇⹜ᢱߩ⺃ዉ⿠㔚ജ᷹ቯ↪ߢ޽ࠆޕ

࠰࡟ࡁࠗ࠼ࠦࠗ࡞2ߣ3ߪޔ੤ᵹ⏛႐⊒↢

ᤨߦࠦࠗ࡞ߩਛ߇ⓨߩ⁁ᘒߢ߶߷หߓ಴

ജ߇ᓧࠄࠇޔਔ⠪ߩ಴ജߩᏅಽ߇߶߷0ߦ ߥࠆࠃ߁ߦᏎ߈ᢙࠍ⺞ᢛߒߡ޽ࠆޕߟ߹ࠅ

⹜ᢱ᷹ቯᤨߪޔ ᣇߩ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ߦ

⹜ᢱࠍ㈩⟎ߒޔ߽߁ ᣇߩⓨߩ࠰࡟ࡁࠗ࠼

ࠦࠗ࡞߆ࠄ⊒↢ߔࠆ಴ജࠍᏅߒᒁߊߎߣ ߢޔ⹜ᢱߩ⏛ൻ₸ߦ⿠࿃ߒߚ⺃ዉ⿠㔚ജߩ ߺࠍขࠅ಴ߔޕߒ߆ߒታ㓙ߦߪޔⓨߩ⁁ᘒ ߢߩ࠰࡟ࡁࠗ࠼ࠦࠗ࡞2෸߮3ߩ಴ജߪቢ

ోߦ৻⥌ߖߕޔ⚿ᨐߣߒߡਔ⠪ߩᏅಽߩ಴

ജࠍࡠ࠶ࠢࠗࡦࠕࡦࡊߢ᷹ቯߔࠆߣޔ৻ቯ ߩ⺃ዉ⿠㔚ജV_back߇ᬌ಴ߐࠇࠆޕߟ߹ࠅታ 㓙ߦ⹜ᢱࠍ᷹ቯߒߚ႐วޔ࠰࡟ࡁࠗ࠼ࠦࠗ

࡞2ߦ⹜ᢱࠍ⸳⟎ߒ࠰࡟ࡁࠗ࠼ࠦࠗ࡞2ߩ

಴ജ߆ࠄ࠰࡟ࡁࠗ࠼ࠦࠗ࡞3ߩ಴ജࠍᏅߒ

ᒁ޿ߚ⺃ዉ⿠㔚ജV_2inࠍ᷹ቯߔࠆߣޔ

sample back

in V V

V₂ = + ^…(15)

ߣߥࠆޕߟ߹ࠅޔV_2inߪ⹜ᢱߦ⿠࿃ߒߚ⺃ዉ⿠㔚ജV_sampleߦV_back߇ടࠊߞߚ୯ߣߥࠆޕߎߩ V_backࠍขࠅ㒰ߊߚ߼ޔV_2inࠍ᷹ቯߒߚᓟޔ⹜ᢱࠍ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 3ߦ⒖േߒޔV_2inࠍ᷹ቯ ߒߚ႐วߣหߓࠃ߁ߦޔ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 2 ߩ಴ജ߆ࠄ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 3 ߩ಴ജࠍᏅߒ ᒁ޿ߚ⺃ዉ⿠㔚ജV_3inࠍ᷹ቯߔࠆޕ

sample back

in V V

V₃ = − ^{…(16 )}

(15)ᑼ෸߮(16)ᑼࠃࠅޔV_2in߆ࠄ V_3inࠍᒁ޿ߚ୯∆VߪV_sample ߩߺߩ಴ജߣߥࠆߎߣ߇ࠊ߆ࠆޕ ᧄ᷹ቯߢߪએ਄ߩᚻᴺࠍ↪޿ߡ∆Vࠍ᷹ቯߒߚޕߘߩ㓙ޔ⹜ᢱ૏⟎ߩ⒖േߪ࠰࡟ࡁࠗ࠼ࠦࠗ

࡞ో૕ࠍ⒖േߔࠆߎߣߦࠃࠅⴕߞߚޕ߹ߚޔ੹࿁⺃ዉ⿠㔚ജߩᬌ಴ߦ↪޿ࠆࡠ࠶ࠢࠗࡦࠕ ࡦࡊߢߪޔ੤ᵹ㔚࿶ߩᝄ᏷෸߮ෳᾖାภ㧔ߎߎߢߪ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 1 ߦࠃࠅ⊒↢ߔࠆ੤

ᵹ⏛႐㧕߆ࠄߩ૏⋧ߩߕࠇࠍหᤨߦ᷹ቯน⢻ߢ޽ࠅޔߎߩᯏ⢻ࠍ↪޿ߡޔχ′ߦᲧ଀ߔࠆෳ

ᾖାภߣห૏⋧ߩ಴ജ∆V_xޔ߅ࠃ߮χ′′ߦᲧ଀ߔࠆ90^Oㆃࠇߚ૏⋧ߩ಴ജ∆V_yࠍ᳞߼ߚޕ 2.4 ੤ᵹ⏛᧤⸘ߩᩞᱜ

᷹ቯߒߚ⺃ዉ⿠㔚ജ߆ࠄ⏛ൻ₸߳ߩᄌ឵ߪޔ੍߼⏛ൻ₸߇ᣢ⍮ߢ޽ࠆᮡḰ⹜ᢱߦࠃࠅᓧ ࠄࠇࠆ⺃ዉ⿠㔚ജߣ⏛ൻ₸ߩ㑐ଥࠍ↪޿ߡ߅ߎߥߞߚޕ੹࿁ߪᮡḰ⹜ᢱߣߒߡ Gd₂O₃☳ᧃ ࠍ↪޿ߚޕᚲቯߩ㊀㊂ߩGd₂O₃☳ᧃࠍߟ߼ߚ㐳ߐ10 mm⒟ᐲߩ࠹ࡈࡠࡦ⵾ߩ╴ࠍޔGd₂O₃

☳ᧃߩ㊀㊂ࠍᄌ߃ߡ5⒳㘃૞ᚑߒޔߘࠇߙࠇߩ⺃ዉ⿠㔚ജࠍ᷹ቯߒߚޕ᷹ቯ଀ߣߒߡGd₂O₃

☳ᧃ45.4 mgߩ᷹ቯᤨߩ⺃ዉ⿠㔚ജߩᄌൻࠍ࿑2ߦ␜ߔޕ࿑2ߦ␜ߒߚ⺃ዉ⿠㔚ജߪ࠰࡟ࡁ

ࠗ࠼ࠦࠗ࡞2 ߆ࠄ࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 3ߩ಴ജࠍᏅߒᒁ޿ߚ୯ߢ޽ࠅޔᦝߦࡠ࠶ࠢࠗࡦࠕࡦ ࡊߦࠃࠅ੤ᵹ⏛႐ߣห૏⋧ߩV_xޔ෸߮૏⋧߇90^OㆃࠇߚV_yࠍಽ㔌ߒߡ᷹ቯߒߚ⚿ᨐߢ޽ࠆޕ

߹ߚޔ࿑2ߩԘߩ㗔ၞ߇࠰࡟ࡁࠗ࠼ࠦࠗ࡞2ߦ⹜ᢱࠍ㈩⟎ߒߚ႐วߩ಴ജ㧔(15)ᑼߩV_2inߦ

⋧ᒰ㧕ޔԙߩ㗔ၞ߇࠰࡟ࡁࠗ࠼ࠦࠗ࡞3ߦ⹜ᢱࠍ㈩⟎ߒߚ႐วߩ಴ജ㧔(16)ᑼߩV_3inߦ⋧ᒰ㧕 ߢ޽ࠆޕߎࠇࠃࠅޔV_backߣߒߡV_xߢ-510µVޔV_yߢ280 µV⒟ᐲߩ಴ജ߇޽ࠆߎߣ߇ࠊ߆ࠆޕ ߎࠇ߇࠰࡟ࡁࠗ࠼ࠦࠗ࡞ 2 ෸߮ 3 ߩࠕࡦࡃ࡜ࡦࠬಽߩ಴ജߣߥࠆޕ⹜ᢱߩ⏛ൻ₸ߦኻᔕߔ ࠆޔԘߣԙߩᏅಽ∆Vߪޔ∆V_xߢ14.1 µV಴ജߐࠇࠆߩߦኻߒߡޔ∆V_yߢߪ߶ߣࠎߤ0ߣߥࠆޕ ߟ߹ࠅޔ੹࿁↪޿ߚ๟ᵄᢙߢߪޔ૏⋧ߩߕࠇߪ߶߷0ߣߥࠅޔV_xࠃࠅ᳞߼ࠆχ′ߩ୯ߪ㕒⏛

႐ਅߢߩ⏛ൻ₸χߦ߶߷৻⥌ߔࠆߣ޿߃ࠆޕߎߩ∆VߣGd₂O₃ߩ㊀㊂ߩ㑐ଥࠍ᷹ቯߒߚ⚿ᨐ ࠍ࿑3ߦ␜ߔޕ᷹ቯߪฦ㊀㊂ߢ5࿁ⴕߞߚޕߎߩ⚿ᨐࠃࠅޔ∆V_xߪGd₂O₃ߩ㊀㊂ߦኻߒߡ⋥

✢㑐ଥޔ∆V_yߪో㗔ၞߢ߶߷ 0ߢ޽ࠆߣࠊ߆ࠆޕ∆V_xߩ⋥✢ࠍᦨዊੑਸ਼ᴺߦࠃࠅㄭૃߔࠆߎ ߣߢޔ࿑3ਛߦ␜ߔᑼ߇ᓧࠄࠇߚޕGd₂O₃ߩ⏛ൻ₸ߪቶ᷷ߢ1.74˜10^-6 m³/kgߢ޽ࠆߎߣ߇

⍮ࠄࠇߡ߅ࠅ[5]ޔߎߩ୯ߣᦨዊੑਸ਼ᴺߦࠃࠅᓧࠄࠇߚ⋥✢ߩᑼ߆ࠄޔਅ⸥ߩ⺃ዉ⿠㔚ജ∆V_x (µV)ߣ⏛ൻ₸χ^(m3/kg)ߩ㑐ଥᑼࠍᓧߚޕ

( )

W V_x 1.74 10 1

31292 . 0

10386 .

0 × × ₆×

−

= ∆ ⁻

χ ^…(17)

ߎߎߢޔW (mg)ߪ᷹ቯ⹜ᢱߩ㊀㊂ࠍ␜ߔޕPd ᳓⚛ൻ‛ߩ᷹ቯߦࠃࠅᓧࠄࠇߚ∆V_xߪߎߩᑼ

ࠍ↪޿ߡ⏛ൻ₸ߦᄌ឵ߒߚޕ߹ߚޔฦ㊀㊂ߢ᷹ቯߒߚ 5 ὐߩᮡḰ஍Ꮕࠍ᳞߼ࠆߣޔᦨᄢߢ

0.208µVߢ޽ߞߚޕᮡḰ஍Ꮕߩ2୚ࠍಽ⸃⢻ߣߔࠆߣޔPd᷹ቯᤨߢߩⵝ⟎ߩಽ⸃⢻ߪ਄ᑼ

ࠃࠅ2.17˜10^-9 m³/kgߣ⷗Ⓧ߽ࠄࠇߚޕ 㧔㧡㧕Pd᳓⚛ൻ‛ߩ᷹ቯ

᷹ቯ⹜ᢱߢ޽ࠆ Pd㧔99.9㧑ޔ࠾࡜ࠦ㧕ߪޔ᧼⁁ߩ߽ߩࠍ࠮࡜ࡒ࠶ࠢ߿ߔࠅߢ☳ᧃ⁁ߦട Ꮏߒߚ߽ߩࠍ↪޿ߚޕߘߩᓟޔPCT᷹ቯⵝ⟎ߦขࠅઃߌߚ⍹⧷࠮࡞ਛߦޔ⚂1 gߩ☳ᧃPd ࠍ޿ࠇޔ࠮࡞ਛࠍ5˜10^-5 Paએਅ߹ߢឃ᳇ߒߚޕߘߩᓟޔᵴᕈൻಣℂߣߒߡ523 Kߢ2 hߩ ടᾲឃ᳇ࠍⴕ޿ޔ಄ළᓟߩ⁁ᘒࠍ᳓⚛Ớᐲ[H]/[Pd] = 0ߣߒߚޕߎߎ߆ࠄPdߦ৻ቯ㊂ߩH₂

ࠟࠬࠍዉ౉ߒޔPd᳓⚛ൻ‛ߣ᳇⋧ߩH₂ࠟࠬ߇ᐔⴧߦ㆐ߒߚߩߜߦޔ਄⸥ⵝ⟎ߦࠃࠅPd᳓

⚛ൻ‛ߩ⺃ዉ⿠㔚ജࠍ᷹ቯߒߚޕߎࠇࠍޔᐔⴧ࿶߇0.1 MPa⒟ᐲߦߥࠆ߹ߢ➅ࠅ㄰ߒⴕߞߚޕ

⺃ዉ⿠㔚ജߩ᷹ቯߪޔ295 ~ 300 Kߩቶ᷷ߦߡޔ࠰࡟ࡁࠗ࠼ࠦࠗ࡞1ߦ๟ᵄᢙ487 Hzޔ੤ᵹ ᝄ᏷Vp-p㧔ᦨᄢ୯ߣᦨዊ୯ߩᏅ㧕10 Vߩ੤ᵹ㔚࿶ࠍශടߔࠆߎߣߢⴕߞߚޕ

3. ታ㛎⚿ᨐ

࿑4ߦ੤ᵹ⏛᧤⸘ࠍ↪޿ߡ᷹ቯߒߚPd᳓⚛ൻ‛ߩ∆V_x෸߮∆V_yߩ᳓⚛Ớᐲଐሽᕈޔ෸߮ᐔ ⴧ࿶ߩ᳓⚛Ớᐲଐሽᕈࠍ␜ߔޕPdߩᐔⴧ࿶ߪ[H]/[Pd] = 0.05એ਄0.6ᧂḩߢ߶߷৻ቯߩ୯ࠍ

␜ߒޔ[H]/[Pd] > 0.6ߢᕆỗߦჇടߒߚޕߎߩ௑ะߪㆊ෰ߦ᷹ቯߐࠇߚ⚿ᨐ[6]ߣࠃߊ৻⥌ߒ

ߚޕ

ᐔⴧ࿶ߣหᤨߦ᷹ቯߒߚ∆V_x߅ࠃ߮∆V_yߦߟ޿ߡߪޔ∆V_xߪ᳓⚛Ớᐲ߇㜞ߊߥࠆߦᓥ޿න

⺞ߦᷫዋߒޔ[H]/[Pd] = 0.65ߢߪ߶߷0ߦ೔㆐ߒߚޕ߹ߚޔߘࠇએ਄ߩ᳓⚛Ớᐲߢߪ∆V_xߪ Fig. 2. Typical measurement result of

in-phase and out-of-phase output voltage for 45.4 mg Gd₂O₃ powder.

Fig. 3. Gd₂O₃ weight dependence of output signal,∆V_x and ∆V_y. The dashed line shows the result by least squared fit to ∆V_x.

-520 -515 -510 -505 -500

270 275 280 285 290

0 100 200 300 400 500 600

Gd2O

3 powder (45.4 mg)

output voltage, V x / µV output voltage, V y / µV

time, t / sec

f = 487 Hz, Vp-p = 10 V, 295 K

∆V_x

㽲 㽳

0 2 4 6 8 10 12 14 16

0 2 4 6 8 10 12 14 16

0 10 20 30 40 50

Gd₂O₃ powder

y = 0.10386 + 0.31292x , R= 0.99913

output signal, ∆V x_Gd2O3 / µV

Gd2O

3 weight, w

Gd2O3 / mg

output signal, ∆V Y_Gd2O3 / µV

ᄌൻߒߥ߆ߞߚޕ৻ᣇޔ∆V_yߪ[H]/[Pd] = 0.2⒟ᐲ߹ߢ߶߷৻ቯߢ޽ࠅޔ0ߢߪߥ޿᦭㒢ߩ୯ ࠍ␜ߒߚޕ[H]/[Pd] > 0.2ߢߪޔ∆V_yߪ[H]/[Pd]ߩჇടߦᓥ޿න⺞ᷫዋߒޔ∆V_x߇߶߷0ߣߥࠆ

[H]/[Pd] = 0.65એ਄ߦ߅޿ߡ߽න⺞ᷫዋߒ0ߦߪߥࠄߥ߆ߞߚޕ೨ㅀߒߚࠃ߁ߦޔ੹࿁ታ㛎

ߢ↪޿ߚ੤ᵹ⏛႐ߩᝄേᢙߪචಽዊߐ޿ߣ⠨߃ࠄࠇޔ߹ߚ PdߪPauli Ᏹ⏛ᕈߢ޽ࠅᄢ߈ߥ

⏛᳇ࡕ࡯ࡔࡦ࠻ࠍᜬߚߥ޿ߎߣ߆ࠄޔ∆V_y= 0ࠍ␜ߔߪߕߢ޽ࠆޕߎߩ∆V_y߇᦭㒢ߩ୯ࠍ␜ߔ

ේ࿃ߣߒߡޔ੤ᵹ⏛႐ਛߦ߅޿ߡ⹜ᢱਛߦ⊒↢ߔࠆ⺃ዉ㔚ᵹߦࠃࠆᓇ㗀߇⠨߃ࠄࠇࠆޕߟ

߹ࠅޔPd᳓⚛ൻ‛ߩ᳓⚛Ớᐲ߇ჇടߔࠆߎߣߢPd☳ᧃ߇⤘ᒛߒ☳ᧃห჻ߩ⚿ว߇ᡷༀߐࠇ ࠆߚ߼ޔ⺃ዉ㔚ᵹߩࡄࠬ߇㐳ߊ᭴▽ߢ߈ࠆࠃ߁ߦߥࠅޔ⚿ᨐߣߒߡ⺃ዉ㔚ᵹߦࠃࠅ⊒↢ߔ ࠆ⏛᧤߇ᄢ߈ߊߥࠆߚ߼ߢߪߥ޿߆ߣផኤߢ߈ࠆޕૉߒޔߎࠇࠄߩ⸃ᨆߪᦝߥࠆ⹦⚦ߥ᷹

ቯ෸߮⸃ᨆ߇ᔅⷐߣߥࠆߚ߼ޔ⃻ᤨὐߢߪߎࠇએ਄ߩᬌ⸛ߪⴕࠊߥ޿ޕ

࿑ 5ߦ(17)ᑼࠍ↪޿ߡ∆V_xߩ୯ࠍ⏛ൻ₸χߦᄌ឵ߒߚ⚿ᨐࠍ␜ߔޕ޽ࠊߖߡ SQUID⏛᧤

⸘ࠍ↪޿ߡ᷹ቯߐࠇߚㆊ෰ߩ᷹ቯ⚿ᨐ[7]ࠍ␜ߒߚޕ੹࿁᷹ቯߐࠇߚ⚿ᨐߣޔㆊ෰ߦ᷹ቯߐ ࠇߚ⚿ᨐߪޔቯ㊂⊛ߦࠃߊ৻⥌ߒߚޕએ਄ࠃࠅޔ੹࿁᭴▽ߒߚ੤ᵹ⏛᧤⸘ߦࠃࠅ᳓⚛ൻ‛

ߩ⏛ൻ₸߇᷹ቯน⢻ߢ޽ࠆߎߣ߇␜ߐࠇߚޕ

4. ߹ߣ߼

㊄ዻ᳓⚛ൻ‛᷹ቯ↪੤ᵹ⏛᧤⸘ࠍ૞⵾ߒޔߘߩᕈ⢻⹏ଔࠍⴕߞߚޕ૞⵾ߒߚ੤ᵹ⏛᧤⸘

ߪޔ⹜ᢱࠍ᳓⚛㔓࿐᳇ࠃࠅขࠅ಴ߔߎߣήߊ᷹ቯ߇ߢ߈ࠆࠃ߁ޔᣢሽߩ PCT᷹ቯⵝ⟎ࠍᡷ ㅧߖߕߦขࠅઃߌࠄࠇࠆࠃ߁⸳⸘ߒߚޕGd₂O₃☳ᧃࠍ↪޿ߡ⏛᧤⸘ߩᩞᱜࠍⴕߞߚߣߎࠈޔ

᷹ቯ㔚࿶ߣ Gd₂O₃ ㊀㊂ߩ㑆ߢࠃ޿⋥✢㑐ଥ߇ᓧࠄࠇޔߎࠇࠃࠅޔ᷹ቯ㔚࿶߆ࠄ⏛ൻ₸߳ߩ ᄌ឵ᑼ෸߮⏛᧤⸘ߩಽ⸃⢻2.17˜10^-9 m³/kg߇ᓧࠄࠇߚޕᧄⵝ⟎ࠍ↪޿ߡPd᳓⚛ൻ‛ߩ⏛

ൻ₸᷹ቯࠍⴕߞߚ⚿ᨐޔㆊ෰ߦႎ๔ߐࠇߚ୯ߣቯ㊂⊛ߦࠃߊ৻⥌ߒߚޕએ਄ࠃࠅޔ੤ᵹ⏛

᧤⸘ࠍ↪޿ߚ㊄ዻ᳓⚛ൻ‛ߩ⏛ൻ₸᷹ቯ߇චಽน⢻ߢ޽ࠆߎߣ߇␜ߐࠇߚޕ Fig. 4. Hydrogen concentration dependence

of output signal and equilibrium pressure for Pd hydride. The dashed line for equilibrium pressure is guide to the eye.

Fig. 5. Hydrogen concentration dependence of magnetic susceptibility of Pd hydride. The figure includes the data reported by Hara et al.[5]

0 10 20 30 40 50 60 70

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 our work Hara et al.

magnetic susceptibility,χ' / 10-9 m3 /kg

[H]/[Pd]

-10 -5 0 5 10 15

0.1 1 10 100

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

output voltage, ∆Vx,∆Vy / µV equilibrium pressure, P / kPa

[H]/[Pd]

∆V_x

∆V_y P

Reference

[1] K. Fukamichi, A. Fujita, and S Fujieda, Journal of Alloys and Compounds 408-412 (2006) 307-312.

[2] F. J. A. den Broeder, S. J. van der Molen, M. Kremers, J. N. Huiberts, D. G. Nagengast, A. T.

M. van Gogh, W. H. Huisman, N. J. Koeman, B. Dam, J. H. Rector, S. Plota, M. Haaksma, R. M.

N. Hanzen, R. M. Jungblut, P. A. Duine, and R. Griessen, Natute394 (1998) 656-658.

[3] ᣣᧄൻቇળ✬ޔᣂታ㛎⑼ቇ⻠ᐳ3 ၮ␆ᛛⴚ2 ⏛᳇㧔ਣༀޔ1976㧕p.97-109.

[4] M. Nikolo, American Journal of Physics63 (1995) 57-65.

[5] L. Sagnotti, P. Rochette, M. Jackson, F. Vadeboin, J. Dinarès-Turell, A. Winkler, and

“Mag-Net” Science Team, Physics of the Earth and Planetary Interiors138 (2003) 25-38.

[6] E. Wicke and H. Brodowsky: G. Alefeld and J. Völkl (Eds.), Hydrogen in Metals II.

Application-oriented Properties, (Springer-Verlag, Berlin, 1978).

[7] M. Hara, J. Sakurai, S. Akamaru, K. Watanabe, K. Nishimura, K. Mori, M. Matsuyama, Materials Transactions47 (2006) 2373-2376.

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