Ehime University Institutional Repository

松野尾, 裕

Japanese

On the Capability Approach

松本, 長彦

Die kopernikanische Wendung der Denkart : Eine Betrachtung uber die transzendentale Erkenntnis bei Kant

宇和川, 耕一

「故郷(ハイマート)」の射程 : ドイツにおけるデイスクールを通じて

山川, 廣司

Religion in the Mycenaean Age (1) : Focusing on the Linear B Tablets

藤田, 勝久

The Information System of the Qin Wooden Tablets Excavated at Liye

オルタナティブ・ワーキングペーパーjournal articl

和田, 寿博

WADA, Toshichiro

調査 戦時期の住友鉱業株式会社別子鉱業所（愛媛県新居浜市東平）の中国人労働者収容所に関するGHQ/SCAP資料

山本, 万喜雄

池谷, 三和子

赤岡, 英子

Use of school management evolution for educational improvement

田中, 弘子

Notes;Policies & measures to protect women and children during the recent sexual crises : with special emphasis on Sinjyuku from 1965 to the 90s.

和瀬, 國臣

On the Thermodynamics 
Bring forward an Issue for Education of Engineering 
Kuniomi WASE
A proposal is given on the education of thermodynamics in engineering. Author believes that the educational methods 
adapted in the university should be radically changed. 
Education for beginners about the basic laws of thermodynamics as well as thermodynamic models should be mainly 
given by using colloquial explanations rather than the mathematical explanations. 
 Key words: Thermodynamics, Design of thermodynamics model, Education of engineering 
Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan 
123
工学ジャーナル　第６巻  
2007年3月
Annual Journal of Eng.,  
Ehime Univ., VI, Mar., 2007
平成 18 年 12 月 11 日  受付  ,  平成 19 年 2 月 7 日  受理
124
125
126
T
V
127
128
129
130
A B B C A C
A B
131
W
Q Z U U( 1)
U( 2)
U
U
U  U( 2)  U( 1)
U
U
U  U( 2)  U( 1)  W + Q + Z 
W Q Z W Q Z
U
132
133
134
U  U  U
135
136
137


On the Thermodynamics : Bring forward an Issue for Education of Engineering

西川, 崇

小竹, 健一

田中, 寿郎

Mn LaMnxO3
Magnetic and Conducting Properties of off-stoichiometric Mn-Perovskite 
LaMnxO3
Takashi Nishikawa, Ken-ichi Kotake and Toehiro Tanaka 
Abstract: Off-stoichiometric manganites LaMnxO3 were prepared by the solid-state reaction. Due to the charge 
compensation, hole carriers will be introduced into the system. Single-phase samples were obtained for the 
x-region with 20.195.0 x . The magnetic and conducting studies revealed that the hole carriers were 
introduced into the system by introducing of metal-site vacancies. However the carrier numbers showed 
saturation tendency. The carrier number saturation will be due to the carrier-localization, caused by the lattice 
imperfection. 
Key words: Mn-perovskite, off-stoichiometry, hole doping, vacancy, localization 
Mn LaMnO3 Mn 3 (3d
4) Mott
(CMR) [1][2]
[3]-[5]
Mn  LaMnxO3
X
Seebeck
LaMnxO3 25.190.0 x (La2O3)
(MnO2) 30
12mm Disc 1000 10h
13000 5hours
84
工学ジャーナル　第６巻  
2007年3月
Annual Journal of Eng.,  
Ehime Univ., VI, Mar., 2007
平成 18 年 11 月 1 日  受付  ,  平成 19 年 1 月 31 日  受理
0 100 200 300
0
2
4
T  (K)
M
  (
B
/c
.f
.)
0.975
1.000
1.025
1.200
1.075
1.150
Fig.3  Temperature dependence of the Fig.4  Temperature dependenceof the  
resistivity of L 
(HIACHI S-3200H) RIGAKU 
GeigerFlex X Rietan
(VSM) 8000Oe
(77K)
(50Oe)
kink point 4
Seebeck
1 X
20.1975.0 x
25.1,975.0x
X
20.1975.0 x
2
3 Mn 0.1x
CT sM CT
( CH )
Fig.1  X-ray profiles of prepared 
samples.
1 1.1 1.2
5.50
5.55
5.60
13.25
13.30
13.35
13.40
13.45
13.50
Mn composition x
L
at
ti
ce
 p
ar
am
et
er
  
a
 (
Å
)
L
attice param
eter 
c
(Å
)
Fig.2  Lattice constants, a and c, of 
samples. 
0 100 200 300
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
0.975
1.025
1.000
1.200
1.150
1.075
x=
  (
m
cm
)
T (K)
85
4 Mn x
conductive 075.1x CT
5 Seebeck S 075.1x x
S 075.1x x S
interstitial
LaMnO3
0.1x Mn 0.1x La1- MnO3 La
Mn
hole La
Mn-O-Mn
X
20.1975.0 x 0.1x
La
Mn
Mn3+
Mn4+ 0.1x
0.1x )OMnMnLa(MnOLaOLaMn 3
4
3
3
3-1
3
-13-13x
La )1( x 3
clear
0.95 1.00 1.05 1.10 1.15 1.20
0
20
40
Mn composition x
S
  (
V
/K
)
Fig.5 Seebeck Coefficient of LaMnxO3.
86
31 MnOBaLa yy 3OLaMn x
hole CT 6
31 MnOBaLa yy Ba y CT
3OLaMn x hole CT
Seebeck
Seebeck S
075.1x S
075.1x
975.0x
0.1x
trap trapping
0.1x 0.1x
La
0.1x Mn
Mn
Mn
20.1975.0 x
Seebeck
[1]  A.Urushibara, Y.Morimoto, T.Arima, A.Asamitsu, G.Kido and T.Tokura : Insulator-metal transition and 
giant magnetoresistance in La1-xSrxMnO3, Phys. Rev. B 51 14103-14109 (1995). 
[2]  P.Schiffer, A.P.Ramirez, W.Bao and S.-W.Cheong : Low Temperature Magnetoresistance and the 
Magnetic Phase Diagram of La1-xCaxMnO3, Phys. Rev. Lett. 75, 3336-3339 (1995) 
[3]  A.Arulraj, R.Mahesh, G.N.Subbanna, R.Mahendiran, A.K.Raychaudhri and C.N.Rao : Insulator-Metal 
Transitions, Giant Magnetoresistance and Related Aspects of the Cation-Deficient LaMnO3 Composirions 
La1- MnO3 and LaMn1- ’O3, J. Solid State Chem. 127, 87-91 (1996) 
0 0.2 0.4 0.6
100
200
300
400
C
ur
ie
 T
em
pe
ra
tu
re
 T
C
 (
K
)
nominal hole number ( /Mn)
LaMnxO3
La1–yBayMnO3
x=1.025
1.075
1.150 1.200
Fig.6  Curie temperature Tc of LaMnxO3 and 
La1-yBayMnO3 was plotted against the 
nominal hole number.
87
[4]  P.S.I.P.N.de Silva, F.M.Richards, F.Cohen, J.A.Alonso, M.J.Matinez-Lope, M.T.Casais, K.A.Thomas and 
J.L.Macmanus-Driscoll : Effects of high vacency concentrations on the magnetic properties of La1-xMn1-yO3,
J. Appl. Phys. 83 394-399 (1997) 
[5]  I.O.Troyanchuk, H.Szymczak, N.V.Kasper and A.Nabialek : Magnetic Study of Orthomanganites 
A1-xMnO3+y (A=La, Eu) with the Perovskite Structure, J. Solid State Chem. 130 171-175 (1997)
88


Magnetic and Conducting Properties of off-stoichiometric Mn-Perovskite LaMn_xO_3

Not a member yet