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„µ¦ª·Á‡¦µ³®rǦŠ¦oµŠÁŽ¦µ¤·„ MgTiO3 ‹µ„¦¼žÂ XRD ´—Á„¨µ—oª¥ª·›¸ Á¦¸¥šÁª¨—r ž¦µ„’ªnµµ¦
˜´ª°¥n µŠ¤¸Ã‡¦Š¦oµŠŸ¨¹„¦°¤Ã±¸ —¦´¨(rhombohedral) space group R-3 (no. 148) ‡n µ“µœ®¨´„(basis) a = b =
5.0532(2) o
A c = 13.8947(8) o
A V = 307.36 o
A 3 °—‡¨o°Š„´“µœ o°¤¼¨(ICDD PDF-2) ®¤µ¥Á¨ 00-006-0494
¨³¤¸‡nµÄ„¨oÁ‡¸¥Š„´“µœ o°¤¼¨ International Crystals System Database(ICSD: a = b = 5.05478(26), c =
13.8992(7) o
A , V = 307.56 o
A 3 ) ¤¸˜ÎµÂ®œnŠ °Š°³˜°¤(˜µ¦µŠ 1) µŠ o °¤¼¨ °Š¦³¥³šµŠ¦³®ªn µŠ°³˜°¤ ¨³‡nµ
µŠ¤»¤¦³®ªnµŠ°³˜°¤(˜µ¦µŠ 2)
˜µ¦µŠ 1 —Š˜ÎµÂ®œnŠ°³˜°¤ °Š MgTiO3
Atom Wyck. x y z Biso ( o
A )2
Mg 6c 0 0 0.358000 0.5
Ti 6c 0 0 0.142000 0.5
O 18f 0.361670 0.043330 0.083300 0.7
˜µ¦µŠ 2 —ŠµŠ o°¤¼ ¨ °Š °Š¦³¥³šµŠ¦³®ªnµŠ°³˜°¤ ¨³¤»¤¦³®ªn µŠ°³˜°¤
Distances( o
A )
Mg-O 2.009(1)
Mg-Ti 3.002(2)
Ti-O 1.911(1)
Angles(o)
Mg-Mg-Mg 114.93(7)
M-Ti-O 115.25(1)
O-Ti-O 48.650(3)
O-Ti-Mg 120.988(9)
T-Mg-Ti 119.20(1)
Ti-Mg-O 76.778(5)
£µ¡š¸É 1 —ŠŸ¨‹µ„Á ¸¥œ„¦µ¢ °Š‡nµš¸É ´ŠÁ„˜Å—o ‡nµ‹µ„„µ¦‡Îµœª– ¨³‡nµ‡ªµ¤Â˜„˜n µŠ °Š‡nµš´ÊŠ
°Š ¡ªnµ¤¸‡ªµ¤°—‡¨o °Š °Š‡nµ—´Š„¨nµª š´ÊŠœ¸Ê‡ªµ¤Á™¸¥¦ °ŠÃ‡¦Š¦oµŠ °Š MgTiO 3 Á„·—‹µ„˜ÎµÂ®œn Š °Š
°°„Ž·Á‹œš¸É 18f ¨³µ¤µ¦™Â—ŠÃ‡¦Š¦oµŠŸ¨¹„ÁŽ¦µ¤· „ MgTiO3 —´Š£µ¡š¸É 2 ǦŠ¦oµŠŸ¨¹„ÁŽ¦µ¤·„ MgTiO3
‹³ ¹Êœ°¥¼n„´¦¼žÂÃ‡¦Š¦oµŠ œ´Éœ‡º° ¦´«¤¸°Š°³˜°¤ ‹Îµœªœ°³˜°¤ ¨³™µœ³ °Š°³˜°¤