…When cooled further from this state, near a certain temperature, the viscosity increases more rapidly than would be expected from a normal thermal activation process, and as the material becomes solid, the thermal expansion coefficient, specific heat, and other properties change almost discontinuously. This change is called the glass transition, and the state below this temperature is a glassy state, a type of amorphous state. The glass transition is not a purely thermodynamic phase transition, and the glass transition temperature depends somewhat on the quenching rate. … *Some explanations of terms that refer to "glass transition" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この状態からさらに冷却すると,ある温度の近くで,ふつうの熱活性化過程から考えられるよりも急激に粘性が大きくなって,固体状態になるとともに熱膨張率や比熱などが,ほぼ不連続に変化する。この変化をガラス転移glass transitionと呼び,この温度以下の状態がガラス状態で,非晶質状態の一種である。ガラス転移は純粋な熱力学的な相転移ではなく,ガラス転移温度は急冷速度に多少依存する。… ※「glass transition」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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