The monoclinic/orthorhombic phase transition in Ba2Cu(HCOO)6:: An optical and X-ray powder diffraction study

被引：2
作者：
Polla, G [1 ]
Vega, D [1 ]
Leyva, AG [1 ]
de Perazzo, PK [1 ]
Lanza, H [1 ]
de Benyacar, MAR [1 ]
机构：
[1] Comis Nacl Energia Atom, Dept Fis, TANDAR, RA-1429 Buenos Aires, DF, Argentina
来源：
PHASE TRANSITIONS | 2000年 / 72卷 / 01期
关键词：
Ba2Cu(HCOO)(6); phase transition; domain structure;
D O I：
10.1080/01411590008224547
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
alpha-Ba2Cu(HCOO)(6) grown at room temperature crystallizes in space group P2(1). On heating a reversible, hysteretic, equitranslational, first-order phase transition at about 60-90 degrees C takes place. Here we discuss the influence of thermal treatments on the occurrence, coexistence and stability ranges of the two observed phases, as studied by several techniques (optical microscopy, differential scanning calorimetry and X-ray diffraction). On cooling a single set of domain walls parallel to (001) have been observed. Taking into account experimental results acid the crystal pseudosymmetry of the alpha phase we propose that the high-temperature beta phase crystallizes in space group Pbnm.
引用
收藏
页码：15 / 24
页数：10
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