NaCl（B1）結構相變至CsCl（B2）結構的過程屬於重構相變。實驗顯示在此類相變過程中，有些以B1結構存在的二元AB型化合物在高壓下會直接相變為B2結構，但也有些物質需經由中間相（intermediate phase）達成相變。根據前人計算結果建議，B2結構為鹵化銀（AgX, X= F、Cl、Br、I）的高壓穩定相，但由於其鍵性落在離子鍵與共價鍵間，可能造成在高壓下的相變行為更複雜。
本研究利用鑽石高壓砧配合同步輻射X光繞射，觀察鹵化銀在室溫下加壓的相變過程，並將實驗結果與前人實驗及理論計算結果比較。AgCl、AgBr、AgI室溫加壓實驗之最高壓力分別為28.0、41.0、47.7 GPa。在AgCl的實驗中，相變過程為B1－KOH－TlI－B2與前人觀察相同，但與前人不同的是本研究發現AgCl相變至B2結構可只藉加壓達成，不需加溫即可克服其相變過程的能障。另外，本研究首次觀察到AgBr的TlI高壓相，其相變過程為B1－KOH－TlI，還觀察到B1結構與KOH結構間存在另一中間相，但目前尚無法定出其結構。AgI加壓至27.1 GPa時仍以KOH結構存在，雖然更高壓下無法辨別其結構，但加壓至47.7 GPa仍未見B2結構的特徵訊號。
本研究中AgBr、AgI雖已分別加壓至41及47.7 GPa皆尚未觀察到其B2結構。但由於這兩者皆觀察到與AgCl相同的中間相，加上前人計算結果之預測，因此我們推測這兩物質在更高壓下也可能相變為B2結構。且這三種樣品的相變壓力與路徑可能與鍵結性質有關，並且隨著共價性越強其相變壓力越大。本研究也觀察到相變過程中，在B1→KOH與TlI→B2之相變體積變化量，其結果呈不連續；而KOH結構相變為TlI結構之體積變化量則呈連續性。因此我們推論B1→KOH及TlI→B2為一階相變，KOH→TlI為二階相變。

The NaCl (B1)/ CsCl (B2) phase transformation is a reconstructive transition. The experimental observations show that some binary AB compounds with B1 phase are known to directly transform into B2 phase, or some of them transform via intermediate phases under high pressures. From computational investigation, a dense B2 phase is clearly favored at high pressures for silver halides (AgX, X= F, Cl, Br and I). In this series of AgX, the bonding character is across from ionic to covalent, which may make the high-pressure structural behavior rather complex.
The silver halides have been studied in the diamond anvil cell (DAC) by angluar dispersive X-ray diffraction technique at room temperature. The high-pressure phase transformations of AgCl, AgBr and AgI have been investigated up to the pressures of 28.0 GPa, 41.0 GPa, 47.7 GPa, respectively. In AgCl, the transformation sequence B1－KOH－TlI－B2 was observed at high pressure that is in good agreement with previous experimental study. Different from previous study, this study showed that AgCl can be transformed to B2 phase at high pressure, room temperature without heating. The pathway of transformation in AgBr was found to be B1－KOH－TlI at high pressure. Moreover, a new phase was observed in AgBr transformed to KOH-type structure from B1 phase, which was not shown in previous study. The identification for this new phase is under way. For AgI, the high pressure KOH-type structure was observed up to 27 GPa. With further compression to the pressure of ~48 GPa, AgI has not been observed to be transformed to B2 phase.
Based on current experimental results and previous computational studies, AgBr and AgI could be transformed to B2 phase at high pressure via same pathway as AgCl. The pressure of phase transition would be related to bonding character; the materials processing stronger covalent bonding will have higher transition pressures. In present study, the results show that the volume changes in B1→KOH and TlI→B2 were discontinuous, but KOH→TlI was continuous. Therefore B1→KOH and TlI→B2 would be the first-order transformation, KOH→TlI was a second-order transformation.

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