In the domain Sr_1−xZr_xF_{2+2 ×} studied at 670 °C between the limits 0.333 ≤ x ≤ 0.353, Sr₂ZrF₈ (x = 0.333) cannot be obtained under our synthesis conditions but a new phase Sr₁₇Zr₉F₇₀ (x = 0.346) is characterized which clearly shows a great analogy with Ba₂ZrF₈ and Pb₂ZrF₈ already described. It presents the same Pnma space group and derives from this basic type by the relation: a = 28.812(10) Å = 3 × a(Ba₂ZrF₈); b = 16.566(6) Å = 3 × b(Ba₂ZrF₈); c = 11.433(4)Å = c(Ba₂ZrF₈).

The superlattice along a results from a change in the step of zigzag parallel rows of respectively Sr cations and ZrF₈ polyhedra. The zigzag step is not composition-dependent but more likely depends on the size of the M²⁺ cation.

The superlattice along b results from an ordered creation of Sr vacancies of multiplicity m = 3 (1 vacancy for 3 Sr) in some Sr raws which changes the Sr/Zr ratio from 2/1 to 1.889/1 (x = 0.346). Then the superstructure along b accommodates the change in stoichiometry in Sr within this phase from Sr₁₈Zr₉F₇₂ (9 × ”Sr₂ZrF₈”) to Sr₁₇Zr₉F₇₀.

A second structure of close composition (x = 0.344) shows that the vacant Sr site can be partially occupied in a disordered way by a small proportion of Sr, giving a composition slightly closer to “Sr₂ZrF₈”. Compared to Sr₁₇Zr₉F₇₀, the over-stoichiometry mechanism is a solid solution model.

For Zr contents comprised between x = 0.346 and 0.353, a series of modulated phases corresponding to various more or less ordered sequences of Sr cations and Sr vacancies along b are characterized by electron diffraction and TEM lattice imaging. They can be interpreted as intermediate between limit phases Sr₁₇Zr₉F₇₀ (x = 0.346) and Sr₁₁Zr₆F₄₆ (x = 0.353), of respective multiplicities m = 3 and m = 2 along the same b direction and of modulation vectors q = 1/3b* and q = 1/2b*. Several modulated phases with q modulation vector comprised between 1/3 b* and 1/2 b* can be characterized.

在Sr _1-x Zr _x F _{2 + 2×}在670  °C的极限0.333≤x≤0.353之间研究的域中，在我们的合成条件下无法获得Sr ₂ ZrF ₈（x = 0.333），而是新相Sr ₁₇ Zr ₉ F ₇₀（x = 0.346）的特征清楚地显示出与已经描述的Ba ₂ ZrF ₈和Pb ₂ ZrF _8的相似之处。它表示相同的Pnma空间组，并通过以下关系从该基本类型派生：a = 28.812（10）Å= 3× a（Ba ₂ ZrF₈）; b = 16.566（6）Å= 3× b（Ba ₂ ZrF ₈）; c = 11.433（4）Å= c（Ba ₂ ZrF ₈）。

沿着结果的超晶格是由分别为Sr阳离子和ZrF ₈多面体的锯齿形平行行的阶跃变化引起的。之字形步骤不依赖于组成，而是更可能取决于M ²⁺阳离子的大小。

沿b的超晶格是由 某些Sr原材料中有序的多重性m = 3（3个Sr的1个空位）的Sr空位的产生导致的，这使Sr / Zr的比值从2/1变为1.889 / 1（x = 0.346）。然后，沿b的上部结构在该阶段内适应了Sr的化学计量变化，从Sr ₁₈ Zr ₉ F ₇₂（9ד Sr ₂ ZrF ₈ ”）到Sr ₁₇ Zr ₉ F ₇₀。

紧密组成的第二种结构（x = 0.344）显示，空的Sr位点可以以少量的Sr无序地部分占据，从而使组成稍微接近“ Sr ₂ ZrF ₈ ”。与Sr ₁₇ Zr ₉ F ₇₀相比，化学计量过高的机理是一种固溶体模型。

对于Zr含量介于x = 0.346和0.353之间的区域，通过电子衍射和TEM晶格成像表征与b沿Sr阳离子和Sr空位的各种或多或少有序序列相对应的一系列调制相。可以将它们解释为极限相位Sr ₁₇ Zr ₉ F ₇₀（x = 0.346）和Sr ₁₁ Zr ₆ F ₄₆（x = 0.353）之间的中间点，分别沿着相同的b方向和m分别为m = 3和m = 2 。调制向量q = 1 / 3b *和q = 1 / 2b *。可以表征具有介于1/3 b *和1/2 b *之间的q调制矢量的几个调制相位。