Related Experiment Video
Updated: May 6, 2026
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
12.7K
New polymorph of InVO4: a high-pressure structure with six-coordinated vanadium
Daniel Errandonea1, Oscar Gomis, Braulio García-Domene
1Departamento de Física Aplicada-ICMUV, Universidad de Valencia, MALTA Consolider Team, Edificio de Investigación , C/Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
Inorganic Chemistry
|October 25, 2013
Summary
Researchers discovered a new high-pressure InVO4 phase with a wolframite structure near 7 GPa. This transformation involves a significant volume collapse and increased bulk modulus, indicating a reconstructive phase change.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Indium vanadate (InVO4) exists in a stable orthorhombic phase.
- Understanding phase transitions under pressure is crucial for materials science.
Purpose of the Study:
- To identify new high-pressure polymorphs of InVO4.
- To characterize the structural and mechanical properties of InVO4 under extreme pressure.
Main Methods:
- In situ high-pressure X-ray diffraction (HP-XRD).
- In situ high-pressure Raman spectroscopy.
- Analysis of structural transitions and compressibility.
Main Results:
- A new wolframite-type InVO4 polymorph was identified near 7 GPa.
- The transition involved a 14% volume collapse and increased bulk modulus from 69 to 168 GPa.
- A third phase coexisted with the low- and high-pressure phases, and the transformation was not fully reversible.
Conclusions:
- The high-pressure phase exhibits 6-fold coordinated vanadium atoms, a unique feature for InVO4.
- The observed volume collapse is linked to increased polyhedral coordination around vanadium.
- The transformation is reconstructive, involving significant changes in atomic arrangement.
Related Concept Videos
02:42Valence Bond Theory
8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K
02:58Crystal Field Theory - Octahedral Complexes
28.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.5K
02:34Structural Isomerism
16.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
16.9K
02:57Coordination Number and Geometry
15.6K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.6K
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
35.6K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
35.6K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
47.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
47.6K