| 摘要 |
The invention relates to a tetragonal single crystal ( 1, 11 ) of composition: <?in-line-formulae description="In-line Formulae" end="lead"?>Z(H,D)<SUB>2</SUB>MO<SUB>4</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> where Z is an element or a group of elements, or a mixture of elements and/or of groups of elements chosen from the group K, N(H,D)<SUB>4</SUB>, Rb, Ce where M is an element chosen from the group P, As and where (H,D) is hydrogen and/or deuterium comprising an approximately parallelepipedal region of large dimensions, especially one in which the length of each of the edges of the faces, AC 1 , AC 2 , AC 3 , is greater than or equal to 200 mm, in particular greater than or equal to 500 mm, which crystal is obtained by crystal growth from solution, from an approximately parallelepipedal single-crystal seed ( 2, 22 ) whose edges of the faces have lengths of AG 1 , AG 2 , AG 3. |
