Material Specification for Ba:11; [Ba(K)-Bi-O]
Process: Solid State Reaction
Notes: "Starting materials for the synthesis were BaO, Bi2O3, and KO2 powders mixed in the appropriate ratios to produce a superconducting structure with x=0.4. One sample, designated sample A, was cut into a rectangular shape of 12 x 2.45 x 1 mm3 from a disk made using the procedure of Dabrowski et al., Physica C 156 (1988) 24, where the N2 anneal was modified as discussed by Hinks et al., Physica C 156 (1988) 477... Sample B of dimensions 12 x 2.7 x 1.9 mm3 was prepared following the modifications of the above procedure by Folkerts et al., Physica C, Vol. 162, 550 (1989)."
Formula: Ba1-xKxBiO3
Informal Name: Ba:11
Chemical Family: Ba(K)-Bi-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Thermoelectric Power for Ba:11; [Ba(K)-Bi-O]
| Sample Number () |
Temperature (K) |
Thermoelectric Power (µV/K) |
| A |
26 |
0.04 |
| A |
28 |
0.14 |
| A |
32 |
0.06 |
| A |
41 |
0.09 |
| A |
67 |
-0.51 |
| A |
97 |
-1.07 |
| A |
116 |
-1.36 |
| A |
146 |
-1.60 |
| A |
153 |
-1.65 |
| A |
207 |
-1.63 |
| A |
222 |
-1.63 |
| A |
275 |
-1.34 |
| B |
10 |
0.00 |
| B |
24 |
-0.03 |
| B |
41 |
-0.34 |
| B |
60 |
-0.87 |
| B |
88 |
-1.59 |
| B |
96 |
-1.79 |
| B |
107 |
-1.93 |
| B |
124 |
-2.17 |
| B |
146 |
-2.29 |
| B |
163 |
-2.37 |
| B |
181 |
-2.34 |
| B |
200 |
-2.27 |
| B |
207 |
-2.25 |
| B |
214 |
-2.15 |
| B |
222 |
-2.15 |
| B |
264 |
-1.87 |
| B |
275 |
-1.75 |
Measurement Method: Thermopower measurement
"We employed a traditional steady-state technique for the determination of the thermoelectric power... In order to carry out meaningful thermopower investigations, it is essential that the absolute thermopower of the reference leads is on hand... we have used a 44 S.W.G. copper wire, the absolute thermopower of which we established to better than 1% accuracy ( ≤0.01 µV/K) from measurements against Tl
2Ca
2Ba
2Cu
3O
10 superconductor up to 120 K. At higher temperatures the copper wire was calibrated against a Pb reference wire... Reliable electrical contacts to the sample are made with indium using an ultrasonic soldering iron. The corresponding temperature difference is determined with the aid of a Chromel-Constantan differential thermocouple backed by a pair of calibrated Pt sensors."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
