On the solid solution Sr
(1.45–x)
Ca
x
Sb
0.55
O
3–y
M. Saidi
a,b,c
, E. Moran
c
, U. Amador
d,
*, M. Abboudi
b
, A. Asskali
a
a
Dpt. de Ge ´nie Chimique, Faculte ´ des Sciences et Techniques de Tanger, Universite ´ Abdelmalek Essaadi,
B.P. 416 Tanger, Morocco
b
Dpt. de Chimie, Faculte ´ des Sciences de Te ´touan, Universite ´ Abdelmalek Essaadi, B.P.
2121 Te ´touan, Morocco
c
Dpto. de Quı ´mica Inorga ´nica, Facultad de Ciencias Quı ´micas, Universidad Complutense de Madrid,
Ciudad Universitaria, E-28040 Madrid, Spain
d
Dpto. de Quı ´mica Inorga ´nica y Materiales, Facultad de Ciencias Experimentales y Te ´cnicas, Universidad
San Pablo CEU, Urb. Monteprı ´ncipe, 28668 Boadilla del Monte, Madrid, Spain
(Refereed)
Received 10 August 1999; accepted 1 October 1999
Abstract
Several compositions in the system Sr
(1.45–x)
Ca
x
Sb
0.55
O
3–y
(0 x 1.45) have been synthesized
by solid state reaction in air at 1000°C and investigated by powder X-ray diffraction and EDS
microanalysis. They exhibit good thermal stability up to 1200°C. The solid solution range was
delimited in the composition 0 x 1.1. For quantities of Ca
2+
higher than 1.1, the amount of solid
solution decreases and another phase, Ca
6
Sb
2
O
10
, appears. The lattice parameters of the system
Sr
(1.45–x)
Ca
x
Sb
0.55
O
3–y
decrease with increasing Ca
2+
content. © 2000 Elsevier Science Ltd. All
rights reserved.
Keywords: A. Inorganic compounds; B. Chemical synthesis; C. X-ray diffraction; D. Phase equilibria
1. Introduction
Soon after the discovery of the high-T
c
Bi-cuprate family of superconductors with general
formula Bi
2
Sr
2
Ca
n–1
Cu
n
O
y
(n = 1, 2, 3) [1–5], several attempts to partially or completely
substitute Sb for Bi, with the aim of improving the properties of these materials, were
* Corresponding author. Fax: 34-91-3510475.
E-mail address: UAMADOR@CEU.ES (U. Amador).
Pergamon Materials Research Bulletin 35 (2000) 1269 –1275
0025-5408/00/$ – see front matter © 2000 Elsevier Science Ltd. All rights reserved.
PII: S0025-5408(00)00318-4