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Organic Compounds

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...

Molecules and Compounds

Molecules and Compounds

Atoms and Molecules

Elements and Compounds

Elements and Compounds

Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
Elements
Elements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...

Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

Ionic Compounds: Formulas and Nomenclature

Ionic Compounds: Formulas and Nomenclature

An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.

Ions as Acids and Bases

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:

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Related Experiment Video

Updated: Feb 2, 2026

Fabrication and Characterization of Superconducting Resonators

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Superconductivity in a 122-type Fe-based compound (La,Na,K)Fe₂As₂.

Kenji Kawashima^1,2, Shigeyuki Ishida³, Hiroshi Fujihisa³

¹IMRA Material R&D Co., Ltd., 2-1 Asahi-machi, Kariya, Aichi, 448-0032, Japan. kenji.kawashima@aisin.co.jp.

Scientific Reports

|November 16, 2018

Summary

We synthesized a new Fe-based superconductor, (La,Na,K)Fe2As2, with a 122-type structure. Its superconducting transition temperature (Tc) is 22.5 K, comparable to similar materials but lower than typical FeSCs due to ion distribution.

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Last Updated: Feb 2, 2026

Fabrication and Characterization of Superconducting Resonators

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Published on: May 21, 2016

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Area of Science:

Materials Science
Condensed Matter Physics
Solid State Chemistry

Background:

Fe-based superconductors (FeSCs) are a class of materials exhibiting superconductivity.
Understanding the structural and electronic properties of FeSCs is crucial for developing new superconducting technologies.
The 122-type (ThCr2Si2-type) and 1144-type structures are common motifs in FeSCs.

Purpose of the Study:

To synthesize and characterize a novel Fe-based superconductor with the formula (La,Na,K)Fe2As2.
To determine the crystal structure and superconducting properties of the synthesized material.
To investigate the factors influencing the superconducting transition temperature (Tc) in this FeSC.

Main Methods:

Solid-state synthesis of (La,Na,K)Fe2As2.
X-ray diffraction (XRD) for crystal structure determination.
Electrical resistivity and magnetic susceptibility measurements to identify superconducting transitions.

Main Results:

The synthesized compound (La,Na,K)Fe2As2 crystallizes in the 122-type structure (space group I4/mmm).
Lattice constants were determined as a = 3.850(1) Å and c = 13.21(1) Å.
A superconducting transition was observed at 22.5 K, with Tc comparable to other 122-type and 1144-type FeSCs but lower than typical values.

Conclusions:

The formation of the 1144-type phase is linked to ionic radius mismatch at the A-site.
The random distribution of La3+ and Na+ ions is identified as the primary reason for the reduced Tc in AE=(La,Na) 122-type and 1144-type FeSCs.
This study contributes to understanding structure-property relationships in Fe-based superconductors.