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: Specific Heat of Sm_1+xBa_2-xCu₃O_y Solid Solution of Orthorhombic and Tetragonal Structure
Author(s): T. Plackowski, D. Wlosewicz, Z. Bukowski, and K. Rogacki
Publication: Physica C Volume: 230 Issue: Not Available Year: 1994 Page(s): 354-360
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Resistivity (normal state), Specific Heat, Debye Temperature

Materials and Properties

Sm:123; [Sm-Ba-Cu-O]

Material Specification for Sm:123; [Sm-Ba-Cu-O] Process: Pyrolysis
Notes: The authors cite Z. Bukowski et al., in Superconductivity, Proc. ICMAS '92, Paris, 21-22 October 1992, eds. C.W. Chu and J. Fink (IITT-International, Gournay-sur-Marne, 1992) and summarize the procedure as follows. "Two series of Sm_1+xBa_2-xCu₃O_y ceramic samples were prepared by the citrate pyrolysis process... The first, Sm_1+xBa_2-xCu₃O , is a series of solid solutions with maximum oxygen content, y , which can be achieved in the common oxygenation procedure. The second, Sm₁Ba₂Cu₃O_y, is a series of samples with exact 123 stoichiometry and different oxygen contents."
Formula: Sm_1+xBa_2-xCu₃O_y
Informal Name: Sm:123
Chemical Family: Sm-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Sm:123; [Sm-Ba-Cu-O]

x of Sm_1+x (formula units)	y of O_y (formula units)	Critical Temperature (K)
0	6.85	90.4
0	6.73	45
0	6.11	0
0.27	7.05	50
0.6	7.11	0

Measurement Method: Four-probe method
"The resistivity ... was measured by a standard four-point method and the... curves were used to determine the critical temperature... as a midpoint of the superconducting transition." No additional measurement details were noted.

Cautions: Unevaluated Data

Resistivity (normal state) for Sm:123; [Sm-Ba-Cu-O]

x of Sm_1+x (formula units)	y of O_y (formula units)	Temperature (K)	Resistivity (normal state) (mΩ·cm)
0	6.62	26	0.01
0	6.62	32	1.68
0	6.62	35	4.69
0	6.62	38	6.38
0	6.62	44	7.99
0	6.62	67	6.88
0	6.62	113	5.26
0	6.62	152	4.95
0	6.62	203	5.45
0	6.62	250	6.25
0	6.62	292	6.90
0	6.73	36	0.06
0	6.73	41	0.01
0	6.73	44	1.38
0	6.73	47	2.26
0	6.73	53	3.80
0	6.73	74	3.36
0	6.73	99	3.06
0	6.73	123	2.98
0	6.73	148	3.12
0	6.73	190	3.47
0	6.73	237	4.05
0	6.73	294	4.55
0	6.82	60	0.06
0	6.82	60	0.79
0	6.82	68	1.30
0	6.82	86	1.52
0	6.82	127	1.73
0	6.82	166	2.01
0	6.82	205	2.30
0	6.82	244	2.51
0	6.82	293	2.79
0	6.85	91	0.05
0	6.85	93	0.49
0	6.85	114	0.63
0	6.85	158	0.84
0	6.85	205	0.97
0	6.85	254	1.18
0	6.85	298	1.24
0.45	0.09	20	258
0.45	0.09	35	140
0.45	0.09	60	78
0.45	0.09	115	26
0.45	0.09	162	19
0.45	0.09	204	12
0.45	0.09	253	4.8
0.45	0.09	295	1.6
0.60	7.11	75	1000
0.60	7.11	85	784
0.60	7.11	102	492
0.60	7.11	124	285
0.60	7.11	150	151
0.60	7.11	191	87
0.60	7.11	230	52
0.60	7.11	269	31
0.60	7.11	292	28
0.39	7.07	26	0.00
0.39	7.07	31	2.19
0.39	7.07	32	5.09
0.39	7.07	35	6.90
0.39	7.07	40	8.23
0.39	7.07	63	6.97
0.39	7.07	102	5.55
0.39	7.07	153	4.84
0.39	7.07	213	4.99
0.39	7.07	257	5.22
0.39	7.07	293	5.45
0.27	7.05	49	0.00
0.27	7.05	52	1.09
0.27	7.05	57	2.11
0.27	7.05	91	2.18
0.27	7.05	143	2.33
0.27	7.05	189	2.56
0.27	7.05	236	2.79
0.27	7.05	290	3.02
0.27	7.05	295	3.01
0.15	6.99	83	0.00
0.15	6.99	85	0.54
0.15	6.99	91	0.85
0.15	6.99	124	1.08
0.15	6.99	173	1.31
0.15	6.99	215	1.46
0.15	6.99	254	1.61
0.15	6.99	293	1.68

Specific Heat for Sm:123; [Sm-Ba-Cu-O]

x of Sm_1+x (formula units)	y of O_y (formula units)	Temperature (K)	Specific Heat (J kg^-1 K^-1)
0	6.85	63	9.5
0	6.85	106	16.6
0	6.85	150	22.1
0	6.85	193	25.8
0	6.85	249	29.2
0	6.85	300	31.0
0	6.73	94	15.1
0	6.73	137	21.0
0	6.73	169	24.0
0	6.73	213	27.2
0	6.73	254	29.3
0	6.73	297	30.8
0	6.11	86	14.9
0	6.11	128	20.3
0	6.11	169	24.3
0	6.11	215	28.1
0	6.11	254	29.7
0	6.11	297	31.2
0.27	7.05	84	13.1
0.27	7.05	129	19.7
0.27	7.05	194	26.2
0.27	7.05	264	30.7
0.6	7.11	86	13.0
0.6	7.11	129	19.1
0.6	7.11	175	23.6
0.6	7.11	221	27.1
0.6	7.1	269	29.2

Measurement Method: Adiabatic calorimetry
The authors cite D. Wlosewicz et al., Cryogenics, Vol. 32, 265 (1992), and summarize the procedure as follows. "The specific heat measurements were carried out in the automated adiabatic calorimeter... The calorimeter operation alternately combines two different modes: a heat pulse method with better absolute accuracy and a faster continuous method with better resolution. The typical heating rate for both methods is 5-10 mK/s. The sample mass varied around 300 mg, which was sufficiently small to achieve a satisfactorily short time for thermal equilibrium (below 60 s) for the used heating rates. At least two pieces of each sample were investigated showing variations smaller than 1.5% and the results were averaged."

Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.

Debye Temperature for Sm:123; [Sm-Ba-Cu-O]

x of Sm_1+x (formula units)	y of O_y (formula units)	Temperature (K)	Debye Temperature (K)
0	6.85	69	389
0	6.85	94	431
0	6.85	121	460
0	6.85	147	477
0	6.85	172	487
0	6.85	198	493
0	6.85	222	495
0	6.85	247	493
0	6.85	271	493
0	6.85	298	499
0	6.73	80	409
0	6.73	100	432
0	6.73	120	451
0	6.73	139	466
0	6.73	157	476
0	6.73	192	484
0	6.73	230	487
0	6.73	247	487
0	6.73	271	486
0	6.73	291	487
0	6.11	82	390
0	6.11	100	418
0	6.11	120	441
0	6.11	141	458
0	6.11	180	480
0	6.11	218	487
0	6.11	261	486
0	6.11	279	484
0	6.11	300	489
0.27	7.05	69	396
0.27	7.05	94	437
0.27	7.05	121	466
0.27	7.05	147	485
0.27	7.05	174	493
0.27	7.05	200	496
0.27	7.05	226	495
0.27	7.05	251	493
0.27	7.05	277	493
0.27	7.05	304	491
0.6	7.11	82	419
0.6	7.11	100	448
0.6	7.11	121	469
0.6	7.11	139	485
0.6	7.11	159	498
0.6	7.11	178	506
0.6	7.11	198	512
0.6	7.11	237	518
0.6	7.11	275	516
0.6	7.11	296	518