Structural, elemental, and electrical conduction properties of corundum-type Mg2Co2Nb2O9

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2023-04-13 DOI:10.1080/01411594.2023.2198128

P. Mohanty

引用次数: 0

Abstract

ABSTRACT is a new member of the corundum-type family. Its crystal structure is trigonal with space group . and ions share the A-site with fifty-fifty occupancy. In , exhibits a 2 + oxidation state, whereas shows a reduction in the charge state from 5 + to 4 + due to the presence of vacancy-trapped electrons in dimmer. The conductivity spectra analysis in view of various transport models states that overlapping large polaron tunneling is the predominant transport process (polaron radius 10.65 Å) in the low-temperature range (303-473 K), while for the high-temperature range (573-673 K), the conduction is intrinsic, and the carriers are primarily small polarons. The proximity between optical bandgap (∼1.60 eV) and conduction activation energy (1.64 eV) is due to the formation of intermediate energy bands near the Fermi level and their participation in high-temperature intrinsic conduction.

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刚玉型Mg2Co2Nb2O9的结构、元素和导电性能

摘要是刚玉型家族的新成员。它的晶体结构是具有空间群的三角形。并且离子以50/50的占有率共享A位点。在中，展示了一个2 + 氧化态，而电荷态从5减少 + 至4 + 由于在调光器中存在空位捕获的电子。根据各种输运模型进行的电导率谱分析表明，在低温范围（303-473）内，重叠的大极化子隧穿是主要的输运过程（极化子半径10.65Å） K），而对于高温范围（573-673 K），传导是本征的，载流子主要是小极化子。光学带隙之间的接近度（～1.60 eV）和传导活化能（1.64 eV）是由于费米能级附近中间能带的形成及其参与高温本征传导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.