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Related Concept Videos

Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
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Alkyl Halides02:45

Alkyl Halides

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Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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Acid Halides to Esters: Alcoholysis01:12

Acid Halides to Esters: Alcoholysis

4.1K
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
4.1K
Mass Spectrometry: Alkyl Halide Fragmentation01:22

Mass Spectrometry: Alkyl Halide Fragmentation

1.6K
Chlorine isotopes exist as 35Cl and 37Cl in a 3:1 ratio, while bromine isotopes exist as 79Br and 81Br in a 1:1 ratio. The mass spectrum of alkyl halides typically produces two distinct molecular ion peaks, the molecular ion peak, [M], and the molecular ion plus two, [M + 2] peak. The relative heights of these two peaks are proportional to the isotopic abundance ratios of the halide. For example, 2‐chloropropane and 1‐bromopropane display two peaks with relative peak heights in a 3:1 and...
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Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

3.6K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
3.6K
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

4.4K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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Updated: Feb 14, 2026

Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition
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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

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Electro-optic Response in Germanium Halide Perovskites.

Grant Walters1, Edward H Sargent1

  • 1Department of Electrical and Computer Engineering, University of Toronto , 35 St. George Street, Toronto, Ontario M5S 1A4, Canada.

The Journal of Physical Chemistry Letters
|February 10, 2018
PubMed
Summary

New germanium halide perovskites offer promising electro-optic properties for optical modulators. Cesium germanium iodide (CsGeI3) shows a significant linear electro-optic effect, exceeding lithium niobate performance.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Photonics

Background:

  • Development of compact, efficient optical modulators requires solution-processable, high-crystalline quality electro-optic materials.
  • Traditional materials like lithium niobate have limitations in processing and performance.

Purpose of the Study:

  • Investigate the linear electro-optic coefficients of cesium and methylammonium germanium halide perovskites using density functional theory.
  • Identify novel materials for advanced optical modulation applications.

Main Methods:

  • Density functional theory (DFT) calculations were employed to investigate material properties.
  • Calculations focused on linear electro-optic coefficients, specifically the r51 tensor element.
  • Frequency responses of linear and nonlinear electronic susceptibilities were also computed.

Main Results:

  • Cesium and methylammonium germanium halide perovskites possess noncentrosymmetric crystal structures suitable for linear electro-optic effects.
  • A significant electro-optic response was predicted for CsGeI3, with an r51 coefficient of 47 pm·V−1 at 1550 nm.
  • This predicted coefficient surpasses that of lithium niobate (31 pm·V−1).

Conclusions:

  • Germanium halide perovskites exhibit strong electro-optic responses driven by distorted crystal structures and high nonlinear susceptibilities.
  • These materials are promising candidates for solution-processed, high-performance optical modulators.
  • The findings open avenues for next-generation photonic devices.