高压物理学报

基于组分Ca₂Pr₂Cu₅O₁₀三元固溶区的范围和晶体结构

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宋功保 ¹^,² , 韩苍穹 ² , 梁敬魁 ²^,³ , 饶光辉 ²

高压物理学报 | 2004,18(1): 27-35

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高压物理学报 | 2004 , 18 (1) : 27 -35

基于组分Ca₂Pr₂Cu₅O₁₀三元固溶区的范围和晶体结构

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宋功保¹^,², 韩苍穹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　621002

^2.中国科学院物理研究所，北京　100080

^3.中国科学院国际材料物理研究中心，辽宁沈阳　110016

作者简介:

宋功保（1966—），男，副教授，凝聚态物理博士后，主要研究方向为功能材料的制备、结构、性能及其关系. E-mail：gbsong931@yahoo.com.cn

The Extent and Crystal Structure of the Solid Solution Based on Ca₂Pr₂Cu₅O₁₀

Gong-Bao SONG¹^,², Cang-Qiong HAN², Jing-Kui LIANG²^,³, Guang-Hui RAO²

Affiliations

^1.School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, 621002, China

^2.Institute of Physics and Center for Condensed Matter 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: 2004-03-05

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摘要

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利用X射线衍射分析和Rietveld结构精修方法研究了基于组分Ca₂Pr₂Cu₅O₁₀三元固溶区的范围和晶体结构。根据X射线分析结果和相消失法，为了保持Ca_2+xPr_2-xCu₅O₁₀结构单位晶胞中恒定的氧含量和电价平衡，基于组分Ca₂Pr₂Cu₅O₁₀的三元固溶区的范围可确定为：在Ca_2+xPr_2-xCu₅O₁₀固溶区的富Ca区（Ca/Pr>1），其表达式仍可以表示为一般的化学计量式Ca_2+xPr_2-xCu₅O₁₀（x=0.4，0.2，0）；在富Pr区（Ca/Pr<1），其表达式为Ca_1.7Pr_2.2·Cu₅O₁₀、Ca_1.4Pr_2.4Cu₅O₁₀，即：Ca_2+xPr_2-xCu₅O₁₀固溶区范围从Ca_2.4Pr_1.6Cu₅O₁₀至Ca_1.4Pr_2.4·Cu₅O₁₀。研究表明：基于组分Ca₂Pr₂Cu₅O₁₀的三元固溶体晶体结构可以看作是正交晶系NaCuO₂型亚晶胞的无公度相；Ca_2.4Pr_1.6Cu₅O₁₀亚晶胞的点阵常数为a₀=0.28246（7）nm，b₀=0.63693（1）nm，c₀=1.06794（1）nm；其正交超结构的点阵常数为a=5a₀，b=b₀，c=5c₀。Ca_2.4Pr_1.6Cu₅O₁₀的结构也可以用单斜超晶胞来表述，该单斜超晶胞的空间群为P2₁/c，Z=4，a=5a₀，b=b₀，c=c₀/sinβ，β=104.79 °或136.60 °，V=5a₀b₀c₀。在基于组分Ca₂Pr₂Cu₅O₁₀的三元固溶体晶体结构中，Ca和Pr之间在一定范围内是可以相互替代的，而且它们在结构中的占位是无序的。

关键词

Ca₂Pr₂Cu₅O₁₀ / 三元固溶区 / X射线衍射 / Rietveld结构精修 / 晶体结构

Abstract

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The extent and crystal structure of the solid solution based on Ca₂Pr₂Cu₅O₁₀ were studied by X-ray diffraction combined with Rietveld structure refinement. According to the principle of valence neutralization and the disappearing-phase method, in the Ca-rich region (i.e. Ca/Pr>1) the composition of solid solution can be expressed as the general stoichiometry Ca_2+xPr_2-xCu₅O₁₀, and in the Pr-rich region (i.e. Ca/Pr<1) as Ca_1.7Pr_2.2Cu₅O₁₀、Ca_1.4Pr_2.4Cu₅O₁₀, i.e., the solid solubility of the Ca₂Pr₂Cu₅O₁₀-based solid solution can be determined as from Ca_2.4Pr_1.6Cu₅O₁₀ to Ca_1.4Pr_2.4Cu₅O₁₀. The crystal structure of Ca₂Pr₂Cu₅O₁₀ based solid solution is an incommensurate phase based on the orthorhombic NaCuO₂-type subcell. The lattice parameters of Ca_2.4Pr_1.6Cu₅O₁₀ subcell are a₀=0.28246 (7) nm, b₀=0.63693 (1) nm, c₀=1.06794 (1) nm, and its orthorhombic superstructure is with a=5a₀, b=b₀, c=5c₀. The Ca_2.4Pr_1.6Cu₅O₁₀ structure is also determined by using a monoclinic supercell with space group P2₁/c, Z=4, a=5a₀, b=b₀, c=c₀/sinβ and β=104.79 ° or 136.60 °, V=5 a₀b₀ c₀. In the structure of the solid solution based on Ca₂Pr₂Cu₅O₁₀, the mutual substitution between Pr and Ca is possible in some bound. Furthermore, they are distributed disorderly in the structure.

Key words

Ca₂Pr₂Cu₅O₁₀ / ternary solid solution / X-ray diffraction / Rietveld refinement / crystal structure

引用本文

宋功保, 韩苍穹, 梁敬魁, 饶光辉. 基于组分Ca₂Pr₂Cu₅O₁₀三元固溶区的范围和晶体结构. 高压物理学报, 2004 , 18 (1) : 27 -35 .

Gong-Bao SONG, Cang-Qiong HAN, Jing-Kui LIANG, Guang-Hui RAO. The Extent and Crystal Structure of the Solid Solution Based on Ca₂Pr₂Cu₅O₁₀[J]. Chinese Journal of High Pressure Physics, 2004 , 18 (1) : 27 -35 .

基金

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国家自然科学基金(50272083)

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2004年第18卷第1期

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接收时间：2003-05-24
首发时间：2026-10-31
出版时间：2004-03-05

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收稿日期：2003-05-24
修回日期：2003-09-22

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　621002

^2.中国科学院物理研究所，北京　100080

^3.中国科学院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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