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URL: https://ko.wikipedia.org/wiki/사방정계

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사방정계

위키백과, 우리 모두의 백과사전.

사방정계(斜方晶系, Orthorhombic crystal system)는 3개의 벡터로 결정 구조를 기술하는 7 결정계 중의 하나이다. 사방정계는 입방정계(정육면체 모양)에서 두 개의 벡터를 서로 다른 길이로 잡아늘린 모양이다. 따라서 직사각형을 밑면으로 하는 사각기둥의 모양이며, 밑면의 양 변의 길이와 높이는 서로 다르다. 입방정계에서 길이만 달라지고 각은 변하지 않으므로 세 벡터는 여전히 직교한다.

사방정계는 단순 사방정계, 저심 사방정계, 체심 사방정계, 면심 사방정계의 4가지 브라베 격자가 존재한다.

단순 사방정계 저심 사방정계 체심 사방정계 면심 사방정계
Orthohombic, simple Orthohombic, base-centered Orthohombic, body-centered Orthohombic, face-centered

아래는 국제 표기법과 쇤플리스 표기법으로 표현된 사방정계에 속하는 점군의 목록이다.

이름 국제 표기법 쇤플리스 표기법
쌍추형 사방정계 D2h
피라미드형 사방정계 C2v
쐐기형 사방정계 222 D2

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