NEUTRON-DIFFRACTION STUDY OF PR VALENCE AND OXYGEN ORDERING IN THE Y1-XPRXBA2CU3O7-DELTA SYSTEM

被引：139
|
作者：
NEUMEIER, JJ
BJORNHOLM, T
MAPLE, MB
RHYNE, JJ
GOTAAS, JA
机构：
[1] UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093
[2] NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899
来源：
PHYSICA C | 1990年 / 166卷 / 1-2期
关键词：
D O I：
10.1016/0921-4534(90)90572-V
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The crystallographic changes that occur with increasing Pr concentration in the Y-xPrxBa2Cu3O7-δ system have been studied by neutron diffraction. As x is increased from 0 to 1, the orthorhombic a, b and c lattice parameters expand monotonically, while the orthorhombic distortion, espressed as b a, decreases, reflecting increased occupation of O(5) sites at the expense of O(4) chain site occupancy. The separation of the CuO2 planes in PrBa2Cu3O7-δ indicates that the Pr ions have an intermediate valence of ∼3.3 in this compound. Evidence is presented for increased interaction between the Pr ions and oxygen ions in adjacent CuO2 planes. © 1990.
引用
收藏
页码：191 / 196
页数：6
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