Material Specification for LaBa:336; [La-Ba(Ca)-Cu-O]
Process: Solid State Reaction
Notes: "All samples... were synthesized by a solid state reaction method. Stoichiometric amounts of La2O3 (pre-heated at 1250 K), Ba(NO3)2, CaCO3 and CuO were mixed and calcined at 1200-1225 K for 24 h. The reacted mixtures were ground well, made into pellets and sintered again at 1270-1300 K for 72 h. It was observed that the sintering temperature had to be reduced progressively as the amount of Ca in the samples increased. The pellets were then pulverized and pressed again into pellets (2 mm thick and 12 mm dia.) and sintered at 1275 K, after which they were annealed in oxygen at 1225 K for 4 h and slow cooled (1 K/min) in flowing oxygen to 500 K followed by furnace cooling to room temperature."
Formula: La1.5-xBa1.5-xCa2xCu3Oy
Informal Name: LaBa:336
Chemical Family: La-Ba(Ca)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for LaBa:336; [La-Ba(Ca)-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | 1 |
| Space Group: |
P4/mmm
|
Cell Parameters
| x of Ca2x (formula units) |
y of Oy (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.0 |
7.20 |
296 |
3.905(8) |
-- |
11.668(5) |
| 0.1 |
7.12 |
296 |
3.901(2) |
-- |
11.651(2) |
| 0.2 |
7.05 |
296 |
3.880(3) |
-- |
11.620(1) |
| 0.3 |
7.03 |
296 |
3.873(7) |
-- |
11.616(3) |
| 0.4 |
6.94 |
296 |
3.870(5) |
-- |
11.624(2) |
| 0.5 |
6.85 |
296 |
3.871(1) |
-- |
11.610(6) |
| 0.6 |
6.80 |
296 |
3.870(4) |
-- |
11.610(5) |
Measurement Method: X-ray diffraction
"CuKα X-ray diffraction patterns for all samples were recorded on a Philips diffractometer (PW1820). The XRD patterns of these samples were indexed on the basis of a tetragonal unit cell and the refined lattice parameters were calculated by a least-squares fitting procedure."
Cautions: Evaluated Data
Critical Temperature for LaBa:336; [La-Ba(Ca)-Cu-O]
| x of Ca2x (formula units) |
Critical Temperature (K) |
| 0.0 |
0 |
| 0.1 |
0 |
| 0.2 |
62 |
| 0.3 |
67 |
| 0.4 |
68 |
| 0.5 |
72 |
| 0.6 |
66 |
| 0.7 |
65 |
| 0.8 |
63 |
| 0.9 |
60 |
| 1.0 |
56 |
Measurement Method: Four-probe method
"DC-resistivity measurements were carried out on a rectangular bar of the samples by the standard four probe method using a Datron Autocal multi-meter (model 1071). The temperature was monitored by employing a Lakeshore temperature controller (model 805)." No additional measurement details were noted.
Cautions: Evaluated Data
Resistivity (normal state) for LaBa:336; [La-Ba(Ca)-Cu-O]
| x of Ca2x (formula unit) |
Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 0.2 |
62 |
0.0 |
| 0.2 |
64 |
0.1 |
| 0.2 |
71 |
1.5 |
| 0.2 |
74 |
2.0 |
| 0.2 |
96 |
2.4 |
| 0.2 |
121 |
2.8 |
| 0.2 |
150 |
3.1 |
| 0.2 |
170 |
3.3 |
| 0.3 |
67 |
0.0 |
| 0.3 |
73 |
0.0 |
| 0.3 |
75 |
1.0 |
| 0.3 |
76 |
1.2 |
| 0.3 |
85 |
1.4 |
| 0.3 |
105 |
1.6 |
| 0.3 |
130 |
1.8 |
| 0.3 |
148 |
1.9 |
| 0.3 |
155 |
2.0 |
| 0.3 |
165 |
2.0 |
| 0.3 |
172 |
2.1 |
| 0.4 |
68 |
0.0 |
| 0.4 |
71 |
0.2 |
| 0.4 |
73 |
0.9 |
| 0.4 |
75 |
1.0 |
| 0.4 |
100 |
1.2 |
| 0.4 |
125 |
1.4 |
| 0.4 |
151 |
1.5 |
| 0.4 |
169 |
1.6 |
| 0.5 |
73 |
0.0 |
| 0.5 |
74 |
0.3 |
| 0.5 |
76 |
0.8 |
| 0.5 |
82 |
0.9 |
| 0.5 |
100 |
1.1 |
| 0.5 |
122 |
1.2 |
| 0.5 |
150 |
1.3 |
| 0.5 |
163 |
1.3 |
| 0.6 |
66 |
0.0 |
| 0.6 |
70 |
2.3 |
| 0.6 |
72 |
3.5 |
| 0.6 |
74 |
5.0 |
| 0.6 |
95 |
5.7 |
| 0.6 |
125 |
6.4 |
| 0.6 |
151 |
6.9 |
| 0.6 |
160 |
7.0 |
| 0.6 |
172 |
7.2 |
Measurement Method: Four-probe method
"DC-resistivity measurements were carried out on a rectangular bar of the samples by the standard four probe method using a Datron Autocal multi-meter (model 1071). The temperature was monitored by employing a Lakeshore temperature controller (model 805)." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Magnetic Susceptibility for LaBa:336; [La-Ba(Ca)-Cu-O]
| x of Ca<2x> (formula units) |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 0.2 |
12 |
-0.04 |
| 0.2 |
28 |
-0.03 |
| 0.2 |
45 |
-0.01 |
| 0.2 |
51 |
0.00 |
| 0.2 |
80 |
0.00 |
| 0.3 |
12 |
-0.14 |
| 0.3 |
29 |
-0.14 |
| 0.3 |
53 |
-0.14 |
| 0.3 |
62 |
-0.13 |
| 0.3 |
66 |
-0.10 |
| 0.3 |
69 |
0.00 |
| 0.3 |
80 |
0.00 |
| 0.4 |
12 |
-0.16 |
| 0.4 |
28 |
-0.16 |
| 0.4 |
44 |
-0.16 |
| 0.4 |
60 |
-0.15 |
| 0.4 |
66 |
-0.10 |
| 0.4 |
69 |
0.00 |
| 0.4 |
80 |
0.00 |
| 0.5 |
12 |
-0.18 |
| 0.5 |
28 |
-0.18 |
| 0.5 |
46 |
-0.18 |
| 0.5 |
58 |
-0.15 |
| 0.5 |
62 |
-0.10 |
| 0.5 |
64 |
-0.01 |
| 0.5 |
69 |
0.00 |
| 0.5 |
80 |
0.00 |
| 0.6 |
12 |
-0.18 |
| 0.6 |
24 |
-0.18 |
| 0.6 |
40 |
-0.18 |
| 0.6 |
55 |
-0.18 |
| 0.6 |
63 |
-0.16 |
| 0.6 |
66 |
-0.09 |
| 0.6 |
69 |
0.00 |
| 0.6 |
80 |
0.00 |
Measurement Method: Ac susceptibility
"AC-susceptibility measurements were carried out by employing an APD susceptometer in conjunction with the PAR two phase lock-in amplifier." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
