NIST High Temp. Superconducting Materials (HTS) Database

NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: The Preparation of "1223" Tl-Ca-Ba-Cu-Oxide Superconducting Films via the Reaction of Silver-Containing Spray Deposited Ca-Ba-Cu-Oxide with Thallium Oxide Vapor
Author(s): J.A. DeLuca, P.L. Karas, J.E. Tkaczyk, P.J. Bednarczyk, M.F. Garbauskas, C.L. Briant, and D.B. Sorensen
Publication: Physica C Volume: 205 Issue: Not Available Year: 1993 Page(s): 21-31
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Critical Current Density

Materials and Properties

Tl:1223; [Tl-Ba-Ca-Cu-O]

Material Specification for Tl:1223; [Tl-Ba-Ca-Cu-O] Process: Solid State Reaction
Notes: "Precursor oxide films weighing... 0.001 g were prepared on 12.5 mm x 8 mm x 0.5 mm polycrystalline yttria-stabilized zirconia substrates using a 0.18M (total metal ions) aqueous spray solution of barium, calcium, copper, and silver nitrates having a Ca:Ba:Cu:Ag mole ratio of 2:2:3:0.37. The spray solution was prepared from calcium carbonate (Johnson Matthey-puratronic grade), barium carbonate (Johnson Matthey-puratronic grade), silver nitrate (Johnson Matthey-puratronic grade), 5N copper shot (Johnson Matthey), semiconductor grade nitric acid, deionized water. The mist output was adjusted so that the required amount of material was deposited after a repetition of 12" spray patterns... The substrate heater block was maintained at 275 °C during the depositon after which it was heated to and held at 650 °C for 5 min and then cooled to 275 °C. The samples were transferred to a movable tray positioned inside an annealing furnace combustion tube through which was maintained a flow of ultra high purity oxygen. The tray was moved into the furnace hot zone which had been preheated to 500 °C. The sample temperature was programmed to rise from 500 °C. The sample temperature was programmed to rise from 500 °C to 845 °C in 30 min at which point the furnace was turned off and the sample allowed to cool under oxygen to 300 °C (... 2h). The sample tray was then moved within the combution tube to a position outside the furnace where it was allowed to cool under oxygen before removal. The precursor oxide films were converted to superconducting TCBCO films in an oxygen ambient via reaction with thallium oxide vapor in the two-zone reactor... After the two-zone reactor process the films were patterned with a test bridge structure... and then heated in an oxygen ambient. The sample temperature was programmed to rise from room temperature to 600 °C at 100 °C/h, hold at 600 °C for 8 h, and then drop to 100 °C at 100 °C/h."
Formula: Tl_xBa₂Ca₂Cu₃O_y
Informal Name: Tl:1223
Chemical Family: Tl-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form: Thin Film

Critical Temperature for Tl:1223; [Tl-Ba-Ca-Cu-O]

x of Tl_x (formula units)	Critical Temperature (K)
0.7	105 ± 1
0.8	106.5 ± 0.5
0.9	106.8 ± 0.8

Measurement Method: Electrical transport method
"The films were patterned with a test bridge structure using the photoresist process... For this study we used both a "small" 0.4 mm x 0.1 mm bridge and a larger 4 mm x 0.2 mm bridge. The larger bridge was patterned to permit measurement across the full 4 mm bridge length and each of four 1 mm segments. The resistance versus temperature characteristic was determined by a four point... DC measurement. From this plot we determined the temperature, T_c(0), at which the resistance became zero... transport measurements were made in a variable temperature cryostat containing a 9 T superconducting magnet. Contact to the sample was made using silver-paint applied over annealed silver pads. Measurement of the critical current versus magnetic field at each temperature was made having first cooled in zero-field from above T_c. An electric field criterion of 1 µV/cm was used to define J_c."

Cautions: Evaluated Data

Critical Current Density for Tl:1223; [Tl-Ba-Ca-Cu-O]

Field Direction ()	Temperature (K)	Magnetic Field (T)	Critical Current Density (kA/cm²)
c axis	4.2	0.02	530
c axis	4.2	0.10	240
c axis	4.2	0.52	160
c axis	4.2	1.9	120
c axis	4.2	9.0	120
c axis	20	0.02	400
c axis	20	0.10	170
c axis	20	0.52	120
c axis	20	1.9	100
c axis	20	9.1	81
c axis	40	0.02	300
c axis	40	0.10	110
c axis	40	0.53	69
c axis	40	1.9	59
c axis	40	5.0	42
c axis	40	9.2	27
c axis	60	0.02	170
c axis	60	0.10	54
c axis	60	0.19	42
c axis	60	0.54	33
c axis	60	1.0	30
c axis	60	4.0	2.3
c axis	60	5.4	0.23
c axis	77	0.02	62
c axis	77	0.05	28
c axis	77	0.10	16
c axis	77	0.51	8.8
c axis	77	0.77	7.4
c axis	77	1.6	0.74
c axis	77	2.0	0.11
c axis	90	0.02	22
c axis	90	0.10	6.4
c axis	90	0.53	0.60
c axis	90	0.62	0.24
ab plane	4.2	0.48	310
ab plane	4.2	1.0	260
ab plane	4.2	1.9	240
ab plane	4.2	4.8	200
ab plane	4.2	8.9	180
ab plane	20	0.10	400
ab plane	20	0.48	230
ab plane	20	1.9	160
ab plane	20	4.8	140
ab plane	20	8.9	130
ab plane	40	0.02	330
ab plane	40	0.05	300
ab plane	40	0.10	250
ab plane	40	0.48	150
ab plane	40	1.9	93
ab plane	40	4.5	71
ab plane	40	8.9	66
ab plane	60	0.02	220
ab plane	60	0.05	189
ab plane	60	0.10	130
ab plane	60	0.48	69
ab plane	60	1.9	40
ab plane	60	4.9	28
ab plane	60	9.0	21
ab plane	77	0.02	130
ab plane	77	0.10	56
ab plane	77	0.49	22
ab plane	77	1.9	13
ab plane	77	5.0	3.2
ab plane	77	8.7	0.19
ab plane	90	0.02	45
ab plane	90	0.10	17
ab plane	90	0.46	6.0
ab plane	90	1.9	1.0