Definition: A change in crystal summetry as a result of changes in bond length or bondangles (as contrasted to reconstructive transformations). The short-range order is unchanged;the long-range order is changed.位移型轉(zhuǎn)變wèi yí xíng zhuǎn biàntransformation: c...[繼續(xù)閱讀]

    Definition: the symmetrical polyhedral chemical structure of relatively simple polyatomicaggregates having coordination numbers of 4 to 8配位多面體pèi wèi duō miàn tǐcoordination: the regulation of diverse elements into an integrated and harmonious operation配位...[繼續(xù)閱讀]

    Definition:a numerical or other measurable factor forming one of a set that defines a systemor sets the conditions of its operation 參(變)數(shù) cān (biàn) shù;參(變)量 cān (biàn) liàngOrigin:mid 17th century: modern Latin,from Greek para-“beside”+metron“measure”Ex...[繼續(xù)閱讀]

    Definition: Crystallinity refers to the degree of structural order in a solid. In a crystal,theatoms or molecules are arranged in a regular,periodic manner. The degree of crystallinity has abig influence on hardness,density,transparency and diffusion.結(jié)晶度j...[繼續(xù)閱讀]

    Definition: In the field of optics,diaphaneity (also called transparency or pellucidity) is thephysical property of allowing light to pass through a material; translucency (also calledtranslucence or translucidity) only allows light to pass through diffus...[繼續(xù)閱讀]

    Definition: A primitive basis is a crystallographic basis of the vector lattice L such that everylattice vector t of L may be obtained as an integral linear combination of the basis vectors,a,b,c. In mathematics,a primitive basis is often called a lattice...[繼續(xù)閱讀]

    Definition:The heat flow across a surface per unit area per unit time,divided by thenegative of the rate of change of temperature with distance in a direction perpendicular to thesurface. Also known as coefficient of conductivity;heat conductivity.熱傳導(dǎo)率rè ...[繼續(xù)閱讀]

    Definition: a theory or story of the origin and development of the universe,the solarsystem,or the earth-moon system天體演化的tiān tǐ yǎn huà deOrigin: 1860-1865; from Greek kosmogonía creation of the worldExample: Self-cultivation for cosmic balance is a retu...[繼續(xù)閱讀]

    Definition:(Mineralogy) a lead antimony sulfide mineral that forms metallic greymonoclinic crystals硫銻鉛礦liú tī qiān kuàngFormula:Pb5Sb4S11Origin:named after Charles Boulanger,French mining engineer,and-iteExample:The quartz from the gold-bearing quartz vei...[繼續(xù)閱讀]

    Definition: relates the angles at which X-rays are scattered from a crystal to the spacingbetween the layers of molecules布拉格方程bù lā gé fāng chéngOrigin:This is the equation derived by William H. Bragg and his son William L. Bragg to explain thescattering ...[繼續(xù)閱讀]