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piezoelectricity

piezoelectricity  

An electric charge induced by a flow of electrons when pressure is applied at the ends of a polar axis of a crystal which lacks a centre of symmetry (see crystal symmetry) and which has different ...
Curie–Weiss law

Curie–Weiss law   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...–Weiss law A law that describes the magnetic susceptibility ( X ) of a ferromagnet ( see ferromagnetism ) at temperatures above the Curie temperature . X = C /( T − θ ‎ ) where C is a constant for each material, T is the temperature in kelvins, and θ ‎ is the Curie temperature in kelvins. The law was formulated by the French physicists Pierre Curie ( 1859–1906 ) and Pierre-Ernest Weiss ( 1865–1940...

Curie symmetry principle

Curie symmetry principle   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

... symmetry principle A principle formulated in 1894 by Pierre Curie ( 1859–1906 ) stating that: ( a ) If certain causes yield known effects, the symmetry elements of the causes should be contained in the effects generated; ( b ) If there is an absence of symmetry elements in the known effects, that absence should be contained in the causes which generated those effects; ( c ) The effects may have higher symmetry than the causes which generated them, therefore the converse of ( a ) and ( b ) is not true. See also sander’s symmetry principle...

piezoelectricity

piezoelectricity   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...charge induced by a flow of electrons when pressure is applied at the ends of a polar axis of a crystal which lacks a centre of symmetry ( see crystal symmetry ) and which has different crystal forms at opposite ends. This property was first detected in 1881 by Pierre and Jacques Curie...

radioactive elements

radioactive elements   Reference library

The Oxford Companion to the Earth

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Subject Reference
Current Version:
2003

...forward by the Polish scientist Marie Sklodowska (later Curie) and Pierre Curie , who discovered that thorium was also an active emitter of penetrating radiation. They then discovered two further elements that emitted radiation, which they named polonium and radium. It was Marie Curie who proposed the term ‘radioactivity’ on the basis of the emissions of radium. In 1903 the Curies shared the Nobel Prize for physics with Henri Becquerel for the discovery of radioactivity. After Pierre's death, Marie continued her work on the chemistry of radium. In...

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