高压物理学报

固相线下Pr_1-xBa_2-yCa_x+yCu₃O_7±δ体系的相关系和晶体结构

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宋功保 ¹^,² , 梁敬魁 ²^,³ , 饶光辉 ²

高压物理学报 | 2004,18(4): 309-314

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高压物理学报 | 2004 , 18 (4) : 309 -314

固相线下Pr_1-xBa_2-yCa_x+yCu₃O_7±δ体系的相关系和晶体结构

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宋功保¹^,², 梁敬魁²^,³, 饶光辉²

作者信息

^1.西南科技大学材料科学与工程学院，四川绵阳　621010

^2.中国科学院物理研究所，北京　100080

^3.国际材料物理研究中心，辽宁沈阳　110016

作者简介:

宋功保（1966—），男，凝聚态物理博士后，研究员. E-mail：gbsong931@yahoo.com.cn

Subsolidus Phase Relation and Crystal Structure in the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ System

Gong-Bao SONG¹^,², Jing-Kui LIANG²^,³, Guang-Hui RAO²

Affiliations

^1.School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China

^2.Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

^3.International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China

出版时间: 2004-12-05

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摘要

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利用X射线衍射分析和Rietveld结构精修的方法研究了固相线下Pr_1-xBa_2-yCa_x+yCu₃O_7±δ体系的相关系和晶体结构。研究表明：950 ℃、空气条件下，Pr_1-xBa_2-yCa_x+yCu₃O_7±δ（y=0）体系系列样品总是含有两相：Pr123（PrBa₂Cu₃O_7±δ）和BaCuO₂；而且，随Ca含量的增加，杂相BaCuO₂的含量也随之增加。Pr_1-xBa_2-yCa_x+yCu₃O_7±δ（x=0）体系y=0.1、0.2、0.3、0.4的样品都只含有Pr123单相；y=0.5的样品含有3相：Pr123、Ca₂CuO₃和Pr₄Ca₁₀Cu₂₄O₄₁。另外，Pr_1-xBa_2-yCa_x+yCu₃O_7±δ（x=0）系列样品（y=0.1、0.2、0.3、0.4）中Pr123相还发生了正交-四方晶系的结构转化。y=0.1和0.2的样品为正交晶系，晶胞参数分别为a=0.390 33（4）和0.389 36（1）nm，b=0.389 53（4）和0.387 73（1）nm，c=1.173 38（4）和1.168 20（2）nm；y=0.3和0.4的样品为四方晶系，晶胞参数分别为a=b=0.387 80（0）和0.387 67（0）nm，c=1.166 00（2）和1.165 20（2）nm。在Pr123结构中，Ba离子可以被Pr离子代替，但不能被Ca离子所代替。Ca离子占据部分Pr离子的位置。在Pr_1-xBa_2-yCa_x+yCu₃O_7±δ（x=0）体系中Pr、Ba和Ca离子间的相互替代中，离子半径比化学性质起到了更大的作用。在950 ℃、空气条件下，Ca离子在Pr_1-xBa_2-yCa_x+yCu₃O_7±δ体系中的最大溶解量是当x=0时，y≤0.4。

关键词

Pr_1-xBa_2-yCa_x+yCu₃O_7±δ体系 / 相关系 / 晶体结构 / X射线衍射 / Rietveld结构精修

Abstract

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Subsolidus phase relation and crystal structure in the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ system were studied by X-ray diffraction combined with Rietveld structure refinement. The results indicate that all of the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ (y=0) samples contain a BaCuO₂ phase besides the Pr123 (PrBa₂Cu₃O_7±δ) phase under 950 ℃ in the air. Furthermore, the content of the BaCuO₂ phase increases with increasing Ca content. The samples of Pr_1-xBa_2-yCa_x+yCu₃O_7±δ (x=0) (y=0.1, 0.2, 0.3, 0.4) contain only one phase, Pr123, except for the sample with y=0.5 which contains three phases, Pr123, Ca₂CuO₃ and Pr₄Ca₁₀Cu₂₄O₄₁. Otherwise, the Pr123 structure takes place the orthorhombic-tetragonal transition in the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ (x=0) system (y=0.1, 0.2, 0.3, 0.4) with increasing Ca ion content. The structure of the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ (x=0) samples with y=0.1 and 0.2 is orthorhombic. The lattice parameters are a=0.390 33(4)~0.389 36(1) nm, b=0.389 53(4)~0.387 73(1) nm, c=1.173 38(4)~1.168 20(2) nm; The structure of the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ (x=0) samples with x=0.3 and 0.4 is tetragonal. The lattice parameters are a=b=0.387 80 (0), 0.387 67 (0) nm, c=1.166 00 (2), 1.165 20 (2) nm. In the Pr123 structure, Ba ions could be replaced by Pr ions, but could not be replaced by Ca ions. Ca ions partially occupy the sites of Pr ions. The ionic radius plays a more important role than the chemical properties in the mutual substitution of Pr, Ba and Ca ions in the Pr123 structure of the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ. The highest content of Ca ions in the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ system is x=0, y=0.4 under 950 ℃ in air.

Key words

Pr_1-xBa_2-yCa_x+yCu₃O_7±δ system / phase relation / crystal structure / X-ray diffraction / Rietveld refinement

引用本文

宋功保, 梁敬魁, 饶光辉. 固相线下Pr_1-xBa_2-yCa_x+yCu₃O_7±δ体系的相关系和晶体结构. 高压物理学报, 2004 , 18 (4) : 309 -314 .

Gong-Bao SONG, Jing-Kui LIANG, Guang-Hui RAO. Subsolidus Phase Relation and Crystal Structure in the Pr_1-xBa_2-yCa_x+yCu₃O_7±δ System[J]. Chinese Journal of High Pressure Physics, 2004 , 18 (4) : 309 -314 .

基金

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国家自然科学基金(50272083)

参考文献

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参考文献引证文献

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2004年第18卷第4期

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接收时间：2003-12-23
首发时间：2026-10-31
出版时间：2004-12-05

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收稿日期：2003-12-23
修回日期：2004-05-09

基金

国家自然科学基金(50272083)

作者信息

^1.西南科技大学材料科学与工程学院，四川绵阳　621010

^2.中国科学院物理研究所，北京　100080

^3.国际材料物理研究中心，辽宁沈阳　110016

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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