Effect of restricted geometry on phase transitions in nanostructured sodium nitrate

IF 2.8 3区 物理与天体物理 Q2 PHYSICS, CONDENSED MATTER
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Aleksandr V. Fokin
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引用次数: 0

Abstract

The study of structure of nanocomposite material based on porous glass with 7 nm average pore diameter filled by sodium nitrate from the melt under pressure has been carried out by synchrotron radiation diffraction upon heating and cooling. The temperature evolution of the elastic peak lineshapes corresponding to the sodium nitrate structure has been analyzed, and it is shown, that in the “virgin” sample there are two types of nanoparticles with dendrite spatial organization and with fundamentally different characteristic sizes. The temperature dependences of the critical index β(T) for the structural transition in sodium nitrate have been obtained, and the crossover in this dependence for nanoparticles with a characteristic size of about 20 nm has been found at T∗ ∼ 445 K both upon heating and cooling. The temperatures of the structure and “melting – crystallization” phase transitions observed in this nanocomposite have been determined.
限制几何形状对纳米结构硝酸钠相变的影响
通过同步辐射衍射法研究了基于多孔玻璃的纳米复合材料的结构,这种多孔玻璃的平均孔径为 7 nm,由硝酸钠从熔体中加压填充而成,在加热和冷却过程中都会发生衍射。研究分析了与硝酸钠结构相对应的弹性峰线形的温度变化,结果表明,在 "原始 "样品中存在两种具有树枝状空间组织的纳米颗粒,其特征尺寸存在本质区别。我们还获得了硝酸钠结构转变的临界指数β(T)的温度相关性,并发现在加热和冷却时,特征尺寸约为 20 nm 的纳米粒子的临界指数β(T)在 T∗∼445 K 时出现交叉。在这种纳米复合材料中观察到的结构和 "熔化-结晶 "相变的温度已经确定。
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来源期刊
Physica B-condensed Matter
Physica B-condensed Matter 物理-物理:凝聚态物理
CiteScore
4.90
自引率
7.10%
发文量
703
审稿时长
44 days
期刊介绍: Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces
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