Polycrystalline samples of the perovskites Ca₂PrCr₂BO₉ (B=Nb, Ta) have been synthesised using the standard ceramic method and characterized by x-ray diffraction, neutron diffraction and magnetometry. Both crystallise in the orthorhombic space group Pnma and exhibit magnetisation reversal when field-cooled in an applied field of 100 Oe. The absolute value of the negative magnetisation at 2 K in an applied field of 100 Oe is an order of magnitude greater in Ca₂PrCr₂TaO₉ than it is for Ca₂PrCr₂NbO₉. Magnetometry and powder neutron diffraction showed that the Cr³⁺ cations in Ca₂PrCr₂NbO₉ and Ca₂PrCr₂TaO₉ order in a G_yF_z magnetic structure below 110 and 130 K, respectively. The Pr³⁺ cations remain paramagnetic down to ~10 K and show no-long range order at 2 K. Both compounds show a large degree of hysteresis in M(H), with coercive fields of 3.79 kOe and 3.03 kOe at 2 K.

钙钛矿Ca ₂ PrCr ₂ B O ₉（B = Nb，Ta）的多晶样品已使用标准陶瓷方法合成，并通过X射线衍射，中子衍射和磁力分析进行了表征。两者均在正交晶体空间群Pnma中结晶，并且在100  Oe的施加磁场中进行场冷时表现出磁化反转。在Ca ₂ PrCr ₂ TaO _9中，在 100  Oe的磁场中2 K时的负磁化强度的绝对值比在Ca ₂ PrCr ₂ NbO ₉中的负磁化的绝对值大一个数量级。。磁力计和粉末中子衍射表明，Ca ₂ PrCr ₂ NbO ₉和Ca ₂ PrCr ₂ TaO ₉中的Cr ³⁺阳离子分别在低于110 K和130 K的G _y F _z磁性结构中有序。Pr ³⁺阳离子在低至〜10 K时仍保持顺磁性，并在2 K时无长程有序。这两种化合物在M（H）中都显示出很大的磁滞，在2 K时的矫顽场为3.79 kOe和3.03 kOe 。