Related Experiment Video
Updated: Jul 10, 2026
06:26
Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
Temperature dependence of the AV3O7 (A = Ca, Sr) structure.
Sebastian Prinz1, Karine M Sparta, Georg Roth
1Institut für Kristallographie der RWTH Aachen, Jägerstrasse 17-19, 52066 Aachen, Germany. prinz@xtal.rwth-aachen.de
Acta Crystallographica. Section B, Structural Science
|November 16, 2007
Summary
New oxovanadates AV(3)O(7) (A = Ca, Sr) were synthesized. Their crystal structures were determined using X-ray diffraction, revealing orthorhombic symmetry and revising the structure of SrV(3)O(7).
Area of Science:
- Solid-state chemistry
- Inorganic materials science
- Crystallography
Background:
- Oxovanadates with the formula AV(3)O(7) contain V(4+) ions with spin 1/2.
- Previous structural assumptions for SrV(3)O(7) require revision.
- Understanding the structural properties of these materials is crucial for potential applications.
Purpose of the Study:
- To synthesize and characterize novel oxovanadates AV(3)O(7) where A = Ca and Sr.
- To determine the crystal structures of CaV(3)O(7) and SrV(3)O(7) at room temperature.
- To investigate the temperature-dependent structural behavior of these compounds.
Main Methods:
- Single-crystal X-ray diffraction was employed for structural analysis.
- Synthesis of AV(3)O(7) compounds (A = Ca, Sr).
- Temperature-dependent X-ray diffraction studies were conducted.
Main Results:
- The room-temperature crystal structures of CaV(3)O(7) and SrV(3)O(7) were determined.
- Both compounds exhibit orthorhombic symmetry with space groups Pnma (CaV(3)O(7)) and Pmmn (SrV(3)O(7)).
- The crystal structure of SrV(3)O(7) was revised, and the temperature dependence of both structures was analyzed.
Conclusions:
- The synthesis and structural determination of AV(3)O(7) (A = Ca, Sr) were successful.
- The revised structure of SrV(3)O(7) provides a more accurate understanding of this material.
- The temperature-dependent studies offer new insights into the structural stability of these oxovanadates.
Related Concept Videos
01:27Atomic Spectroscopy: Effects of Temperature
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
01:19Thermal Strain
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
03:05Acid Strength and Molecular Structure
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
01:18Aromatic Hydrocarbon Anions: Structural Overview
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Due to the absence of continuous overlap of p...
01:12Temperature Dependent Deformation
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
01:18Aromatic Hydrocarbon Cations: Structural Overview
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Removing one hydrogen from the intervening CH2 group with both...