本實驗藉鑽石高壓砧對五種金紅石結構之雙氧化合物，金紅石(Rutile, TiO2)、軟錳礦(Pyrolusite, MnO2)、錫石(Cassiterite, SnO2)、副黃碲礦(Paratellurite, TeO2)及塊黑鉛礦(Plattnerite, PbO2)粉晶進行常溫之壓縮研究。於常溫下以同步輻射為X光源進行能量分散繞射實驗來求得結構及晶格參數。
基本上金紅石結構之雙氧化合物中，TiO2、MnO2、SnO2及PbO2其a軸方向的壓縮量大於c軸方向的壓縮量，TeO2則a軸方向的壓縮量大致與c軸方向的壓縮量相同。
TiO2、MnO2及SnO2的解壓資料回到低壓的趨勢線上，因此屬於可逆的反應；而塊黑鉛礦解壓的資料則並未回到低壓的趨勢線上，因此屬於非可逆反應。
在高壓下則在7、6、5、2、0.5GPa左右分別有∂V/∂P不連續之現象。陽離子同屬於第四族的SnO2 及PbO2 相變的壓力值會隨著陽離子半徑的增加而變小。
金紅石結構雙氧化合物TiO2、MnO2、SnO2、TeO2及PbO2之體彈模量(Ko: bulk modulus)依序分別為250、240、224、110及90Gpa。本實驗發現整體聲速(bulk sound velocity)和平均原子量(mean atomic weight)間有線性關係存在，因此體彈模量可能具有系統系的趨勢存在。
在金紅石結構之雙氧化合物相變後的高壓相方面，TiO2、MnO2、SnO2、TeO2及PbO2依序分別為斜方晶系、單斜晶系、單斜晶系、單斜晶系及斜方晶系，另外TeO2高壓相單斜晶系又可以分成單斜晶系(I)及單斜晶系(II)。

Compression behaviors of five rutile-structure dioxides, TiO2 (Rutile), MnO2 (pyrolusite), SnO2 (cassiterite), TeO2 (paratellurite) and PbO2 (plattnerite) were studied in a piston-cylinder type diamond cell at room temperature. The energy dispersive method was used for the collection of the diffraction signals of the compressed sample using synchrotron radiation as an X-ray source.
Four dioxides (TiO2、MnO2、SnO2 and PbO2) show anisotropic compression along their crystallographic axes with a axis being more compressible than c axis. The compressibility of a axis is similar to that of c axis in TeO2.
A discontinuity in the compression data (i.e. the change in ∂V/∂P) for the five dioxides (TiO2, MnO2, SnO2, TeO2 and PbO2) was found to exist at 7, 6, 5, 2 and 0.5 GPa, respectively. This clearly indicates that a first-order phase transition has taken place in these dioxides. The pressure at which the phase transition occurs in rutile-type dioxides decreases with an increase in the radius of cation. The unloading data show that the phase transitions in TiO2, MnO2 and SnO2 are reversible while those of TeO2 and PbO2 are irreversible.
By fitting the compression data to the Birch-Murnaghan equation, the bulk modulus of TiO2, MnO2, SnO2, TeO2 and PbO2 of the rutile-type structure are determined to be 250, 240, 224,110 and 90 GPa, respectively. A linear relationship was found to exist between the bulk sound velocity and mean atomic weight of the rutile-type dioxides.
The post-rutile phase transformations of the five dioxides (TiO2、MnO2、SnO2、TeO2 and PbO2) were determined to be orthorhombic, monoclinic, monoclinic, monoclinic and orthorhombic, respectively. Two monoclinic phases of TeO2 were found, i.e., the monoclinic phase (I) and monoclinic phase (II).

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